I'm using spring-boot 2.2.0.M2 with Java 11 and i am getting this warning:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/home/porfirio/.m2/repository/org/springframework/spring-core/5.2.0.M1/spring-core-5.2.0.M1.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

I don't know if it is a know bug with spring-boot+java11 or an issue on my end

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

Comment From: sbrannen

@porfirioribeiro, can you please launch your JVM with --illegal-access=debug and provide more information about which code is causing this to occur?

Comment From: sbrannen

Related Issues

• gh-20414
• gh-21317
• gh-22032
• gh-22674

Comment From: isabek

@sbrannen I am getting the same warning messages. I use spring-boot 2.0.7.RELEASE with java

openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment 18.9 (build 11.0.2+9)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)

I launched JVM with --illegal-access=debug and got the following stack trace

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/home/pluto/.m2/repository/org/springframework/spring-core/5.0.11.RELEASE/spring-core-5.0.11.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils$1.run(ReflectUtils.java:61)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at org.springframework.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:52)
    at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:243)
    at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:329)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291)
    at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221)
    at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:174)
    at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:153)
    at org.springframework.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73)
    at org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:122)
    at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:110)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:403)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:254)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:282)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:126)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:692)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:530)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242)

Logs were printed when code defineClass.setAccessible(true); called in org.springframework.cglib.core.ReflectUtils on line 503.

The version of the Spring Framework core org.springframework:spring-core:5.0.11.RELEASE.

Comment From: sbrannen

@Isabek, according to the comments from @jhoeller in https://github.com/spring-projects/spring-framework/issues/22674#issuecomment-476607240, "those warnings will only disappear as of Spring Framework 5.1+".

So, if you are seeing them with 5.0.11.RELEASE, that's to be expected, and you should be able to ignore them for the time being.

Can you confirm that you do not see them on Spring Framework 5.1+?

Comment From: porfirioribeiro

@porfirioribeiro, can you please launch your JVM with --illegal-access=debug and provide more information about which code is causing this to occur?

Sorry for the late reply: The Class-Path manifest attribute in /home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/jaxb-runtime-2.3.2.jar referenced one or more files that do not exist: file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/jakarta.xml.bind-api-2.3.2.jar,file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/txw2-2.3.2.jar,file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/istack-commons-runtime-3.0.8.jar,file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/stax-ex-1.8.1.jar,file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/FastInfoset-1.2.16.jar,file:/home/porfirio/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.2/jakarta.activation-api-1.2.1.jar

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/home/porfirio/.m2/repository/org/springframework/spring-core/5.2.0.M1/spring-core-5.2.0.M1.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.jmx.export.MBeanExporter.registerLazyInit(MBeanExporter.java:708)
    at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:596)
    at org.springframework.jmx.export.MBeanExporter.lambda$registerBeans$2(MBeanExporter.java:551)
    at java.base/java.util.HashMap.forEach(HashMap.java:1336)
    at org.springframework.jmx.export.MBeanExporter.registerBeans(MBeanExporter.java:551)
    at org.springframework.jmx.export.MBeanExporter.afterSingletonsInstantiated(MBeanExporter.java:434)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:883)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:404)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:319)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1275)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1263)
    at net.agroop.platform.operationalapi.OperationalApiApplication.main(OperationalApiApplication.java:10)

Comment From: sbrannen

@porfirioribeiro, thanks for providing the stack trace. I have updated this issue's title accordingly.

Comment From: sbrannen

@jhoeller, I've tentatively assigned this to you since you handled similar issues in the past.

Comment From: dominikmontada

I think I am getting the same warning with spring boot 2.1.5 and Java 11. This is the stack trace I am getting, looks like Spring Framework 5.1.7. The warning started to occur after I added org.springframework.cloud:spring-cloud-starter-sleuth as dependency. Hope this helps!

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/domin/.gradle/caches/modules-2/files-2.1/org.springframework/spring-core/5.1.7.RELEASE/280f821b9ed4dad9993f1d551d6e86557092ae58/spring-core-5.1.7.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactoryBean.getProxy(ProxyFactoryBean.java:378)
    at org.springframework.aop.framework.ProxyFactoryBean.getSingletonInstance(ProxyFactoryBean.java:330)
    at org.springframework.aop.framework.ProxyFactoryBean.getObject(ProxyFactoryBean.java:254)
    at org.springframework.cloud.sleuth.instrument.async.ExecutorBeanPostProcessor.getObject(ExecutorBeanPostProcessor.java:199)
    at org.springframework.cloud.sleuth.instrument.async.ExecutorBeanPostProcessor.getProxiedObject(ExecutorBeanPostProcessor.java:186)
    at org.springframework.cloud.sleuth.instrument.async.ExecutorBeanPostProcessor.createThreadPoolTaskExecutorProxy(ExecutorBeanPostProcessor.java:157)
    at org.springframework.cloud.sleuth.instrument.async.ExecutorBeanPostProcessor.wrapThreadPoolTaskExecutor(ExecutorBeanPostProcessor.java:133)
    at org.springframework.cloud.sleuth.instrument.async.ExecutorBeanPostProcessor.postProcessAfterInitialization(ExecutorBeanPostProcessor.java:74)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.configureAsyncSupport(WebMvcAutoConfiguration.java:221)

build.gradle looks like this:

plugins {
    id 'org.springframework.boot' version '2.1.5.RELEASE'
    id 'java'
}

apply plugin: 'io.spring.dependency-management'

configurations {
    developmentOnly
    runtimeClasspath {
        extendsFrom developmentOnly
    }
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

ext {
    set('springCloudVersion', "Greenwich.SR1")
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.cloud:spring-cloud-starter-sleuth'
    compileOnly 'org.projectlombok:lombok'
    developmentOnly 'org.springframework.boot:spring-boot-devtools'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}

Comment From: drmaciej

Very similar issue on my end, started showing up after upgrading to Boot 2.1.5 and Java 11. Not sure if the stack trace is teh same, so I'll paste it just in case.

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/maciej/.gradle/caches/modules-2/files-2.1/org.springframework/spring-core/5.1.7.RELEASE/280f821b9ed4dad9993f1d551d6e86557092ae58/spring-core-5.1.7.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:471)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:350)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1248)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1168)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857)

Comment From: Gadnex

Hi,

I have been monitoring this issue for a few months as I am experiencing the exact same issue.

When I use Spring Boot 2.1.3.RELEASE with Java 11, then I do not get this WARNING.

When I move to Spring Boot 2.1.4.RELEASE, 2.1.5.RELEASE, 2.1.6.RELEASE and 2.1.7.RELEASE I get the warning.

I am not sure why we did not get this warning on 2.1.3.RELEASE. Maybe it was fixed and there has been a code regression. Or maybe the issue is present on 2.1.3.RELEASE but the WARNING is just not being logged.

Comment From: andrewfinnell

I can confirm this exists with 2.1.5.RELEASE. It seems to be triggered when adding the actuator dependencies or eureka cloud dependencies as I did not see it before then.

These are the BOM's and Deps causing this:

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.2.RELEASE</version>
        </dependency>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.5.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

Comment From: macfeaster

Also getting this on Boot 2.2.0.M6 with JDK 12. Seems to be a slightly different stack trace than the ones posted above:

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/mauritz/.m2/repository/org/springframework/spring-core/5.2.0.RC2/spring-core-5.2.0.RC2.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:471)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:350)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:431)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1808)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:878)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)

Comment From: danielmenezesbr

Same issue on Spring Boot 2.2.0.RC1 + Spring Framework 5.2.0 with JDK 11.

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/repository/org/springframework/spring-core/5.2.0.RELEASE/spring-core-5.2.0.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:471)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:350)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:431)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1807)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116)

java -version
openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.4+11)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.4+11, mixed mode)

Comment From: HomoEfficio

Similar Issue on Spring Boot 2.2.0.RELEASE, Spring Cloud Gateway 2.2.0.M3 (Spring Cloud Version: Hoxton.M3)

/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/java -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=58039:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath .../.gradle/caches/modules-2/files-2.1/org.springframework.cloud/spring-cloud-starter-gateway/2.2.0.M3/cd24e817659ffaecbcd82b31ef76ffce25ed26f7/spring-cloud-starter-gateway-2.2.0.M3.jar: ...
2019-10-20 23:49:28.232  INFO 18208 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2019-10-20 23:49:28.432  INFO 18208 --- [  restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$87f0c492] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.0.RELEASE)

2019-10-20 23:49:28.617  INFO 18208 --- [  restartedMain] i.h.lmsb.gateway.GatewayApplication      : No active profile set, falling back to default profiles: default
2019-10-20 23:49:29.469  INFO 18208 --- [  restartedMain] o.s.cloud.context.scope.GenericScope     : BeanFactory id=09b53e00-ed4c-3ae0-8dad-8ef4d04b27a3
2019-10-20 23:49:29.529  INFO 18208 --- [  restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$87f0c492] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/1003604/.gradle/caches/modules-2/files-2.1/org.springframework/spring-core/5.2.0.RELEASE/e0e1b3c304f70ed19d7905975f6f990916ada219/spring-core-5.2.0.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2019-10-20 23:49:30.179  INFO 18208 --- [  restartedMain] o.s.c.g.r.RouteDefinitionRouteLocator    : Loaded RoutePredicateFactory [After]
...

🍺  java -version
openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.4+11)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.4+11, mixed mode)

Comment From: zhang-wenchao

SpringBoot     2.1.9.RELEASE
SpringCloud    Greenwich.SR3

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/wenchao/.gradle/caches/modules-2/files-2.1/org.springframework/spring-core/5.1.9.RELEASE/dc3815439579b4fa0c19970e6b8e5d774af8d988/spring-core-5.1.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

java --version
openjdk 11.0.4 2019-07-16
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.4+11)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.4+11, mixed mode)

Comment From: jsjchai

java version

java version "11.0.5" 2019-10-15 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.5+10-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.5+10-LTS, mixed mode)

spring version

spring boot   2.1.9.RELEASE
spring cloud  Greenwich.SR3

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/D:/java/apache-maven-3.6.2/.m2/repository/org/springframework/spring-core/5.1.10.RELEASE/spring-core-5.1.10.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

After add '--illegal-access=debug'

2019-11-08 15:34:06,615 restartedMain INFO  [] [] com.netflix.config.DynamicPropertyFactory:281 :: DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@3a596fe0
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/D:/java/apache-maven-3.6.2/.m2/repository/org/springframework/spring-core/5.1.10.RELEASE/spring-core-5.1.10.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor.postProcessAfterInitialization(AbstractAdvisingBeanPostProcessor.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1255)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857)
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:509)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)
2019-11-08 15:34:09,283 restartedMain WARN  [] [] com.netflix.config.sources.URLConfigurationSource:121 :: No URLs will be polled as dynamic configuration sources.

Comment From: Maze-fr

I have the same problem, so here is my small contribution...

I use JDK 11 / Spring Boot 2.2.1

The message appears only if I add Dev Tools dependency. Without Dev Tools, no message. Adding --add-opens java.base/java.lang=ALL-UNNAMED to the spring-boot.run.jvmArguments made the message disappear.

Comment From: dillonredding

I seem to be getting this specifically when I using the @target pointcut expression (with Java 11 or 13, and Spring Boot 2.2.1).

Comment From: marcusportmann

I have the same problem using Java 13 and Spring Boot 2.2.2. My stack trace with '--illegal-access=debug' enabled is included below.

In my case it appears to be linked to an invocation of the "toString()" method on a cglib proxy.

The proxy class (contextClass parameter in the ReflectUtils.defineClass method) has a null class loader so the fallback option is executed.

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/marcus/.m2/repository/org/springframework/spring-core/5.2.2.RELEASE/spring-core-5.2.2.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65) at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135) at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:216) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685) at digital.inception.process.ProcessService$$EnhancerBySpringCGLIB$$24514d65.toString() at digital.inception.process.ProcessServiceTest.processEngineTest(ProcessServiceTest.java:159) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251) at digital.inception.test.TestClassRunner.runChild(TestClassRunner.java:78) at digital.inception.test.TestClassRunner.runChild(TestClassRunner.java:45) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

Comment From: ziodave

Same here with Spring Boot 2.2.2

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/david/.m2/repository/org/springframework/spring-core/5.2.2.RELEASE/spring-core-5.2.2.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65)
    at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135)
    at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:242)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanFactoryAwareMethodInterceptor.intercept(ConfigurationClassEnhancer.java:281)
    at it.wordlift.cloud.config.CustomGlobalMethodSecurityConfiguration$$EnhancerBySpringCGLIB$$feb60ba2.setBeanFactory(<generated>)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor.postProcessProperties(ConfigurationClassPostProcessor.java:454)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:409)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)

As noted by @Maze-fr I confirm that removing org.springframework.boot:spring-boot-devtools removes the warning.

Comment From: Adriansun

If it helps then I have it too (Java 11 / Spring Boot 2.2.3):

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/cors/.m2/repository/org/springframework/spring-core/5.2.3.RELEASE/spring-core-5.2.3.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release

Comment From: scalasm

Same for me (but using Amazon corretto 11 on Windows 10 Pro):

PS C:\Users\SCALASM> java --version
openjdk 11.0.5 2019-10-15 LTS
OpenJDK Runtime Environment Corretto-11.0.5.10.1 (build 11.0.5+10-LTS)
OpenJDK 64-Bit Server VM Corretto-11.0.5.10.1 (build 11.0.5+10-LTS, mixed mode)

The log with --illegal-access=debug is the following:

C:\apps\intellij\jbr\bin\java.exe --illegal-access=debug -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -javaagent:C:\apps\intellij\lib\idea_rt.jar=61735:C:\apps\intellij\bin -Dfile.encoding=UTF-8 -classpath C:\src\links-devops\sparkasse\config-service\target\classes;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-security\2.2.2.RELEASE\spring-boot-starter-security-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter\2.2.2.RELEASE\spring-boot-starter-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.2.2.RELEASE\spring-boot-starter-logging-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\SCALASM\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\SCALASM\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;C:\Users\SCALASM\.m2\repository\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;C:\Users\SCALASM\.m2\repository\org\slf4j\jul-to-slf4j\1.7.29\jul-to-slf4j-1.7.29.jar;C:\Users\SCALASM\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-aop\5.2.2.RELEASE\spring-aop-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-beans\5.2.2.RELEASE\spring-beans-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\security\spring-security-config\5.2.1.RELEASE\spring-security-config-5.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-context\5.2.2.RELEASE\spring-context-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\security\spring-security-web\5.2.1.RELEASE\spring-security-web-5.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-expression\5.2.2.RELEASE\spring-expression-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.2.2.RELEASE\spring-boot-starter-web-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.2.2.RELEASE\spring-boot-starter-json-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.10.1\jackson-databind-2.10.1.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.10.1\jackson-datatype-jdk8-2.10.1.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.1\jackson-datatype-jsr310-2.10.1.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.10.1\jackson-module-parameter-names-2.10.1.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.2.2.RELEASE\spring-boot-starter-tomcat-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.29\tomcat-embed-core-9.0.29.jar;C:\Users\SCALASM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.29\tomcat-embed-el-9.0.29.jar;C:\Users\SCALASM\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.29\tomcat-embed-websocket-9.0.29.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-validation\2.2.2.RELEASE\spring-boot-starter-validation-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\jakarta\validation\jakarta.validation-api\2.0.1\jakarta.validation-api-2.0.1.jar;C:\Users\SCALASM\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.18.Final\hibernate-validator-6.0.18.Final.jar;C:\Users\SCALASM\.m2\repository\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-web\5.2.2.RELEASE\spring-web-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-webmvc\5.2.2.RELEASE\spring-webmvc-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\cloud\spring-cloud-config-server\2.2.1.RELEASE\spring-cloud-config-server-2.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\cloud\spring-cloud-config-client\2.2.1.RELEASE\spring-cloud-config-client-2.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\cloud\spring-cloud-commons\2.2.1.RELEASE\spring-cloud-commons-2.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\cloud\spring-cloud-context\2.2.1.RELEASE\spring-cloud-context-2.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.10.1\jackson-annotations-2.10.1.jar;C:\Users\SCALASM\.m2\repository\org\springframework\security\spring-security-crypto\5.2.1.RELEASE\spring-security-crypto-5.2.1.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\security\spring-security-rsa\1.0.9.RELEASE\spring-security-rsa-1.0.9.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\bouncycastle\bcpkix-jdk15on\1.64\bcpkix-jdk15on-1.64.jar;C:\Users\SCALASM\.m2\repository\org\bouncycastle\bcprov-jdk15on\1.64\bcprov-jdk15on-1.64.jar;C:\Users\SCALASM\.m2\repository\org\eclipse\jgit\org.eclipse.jgit\5.1.3.201810200350-r\org.eclipse.jgit-5.1.3.201810200350-r.jar;C:\Users\SCALASM\.m2\repository\com\jcraft\jsch\0.1.54\jsch-0.1.54.jar;C:\Users\SCALASM\.m2\repository\com\jcraft\jzlib\1.1.1\jzlib-1.1.1.jar;C:\Users\SCALASM\.m2\repository\com\googlecode\javaewah\JavaEWAH\1.1.6\JavaEWAH-1.1.6.jar;C:\Users\SCALASM\.m2\repository\org\slf4j\slf4j-api\1.7.29\slf4j-api-1.7.29.jar;C:\Users\SCALASM\.m2\repository\org\eclipse\jgit\org.eclipse.jgit.http.apache\5.1.3.201810200350-r\org.eclipse.jgit.http.apache-5.1.3.201810200350-r.jar;C:\Users\SCALASM\.m2\repository\org\apache\httpcomponents\httpclient\4.5.10\httpclient-4.5.10.jar;C:\Users\SCALASM\.m2\repository\commons-codec\commons-codec\1.13\commons-codec-1.13.jar;C:\Users\SCALASM\.m2\repository\org\apache\httpcomponents\httpcore\4.4.12\httpcore-4.4.12.jar;C:\Users\SCALASM\.m2\repository\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\dataformat\jackson-dataformat-yaml\2.10.1\jackson-dataformat-yaml-2.10.1.jar;C:\Users\SCALASM\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.10.1\jackson-core-2.10.1.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-devtools\2.2.2.RELEASE\spring-boot-devtools-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot\2.2.2.RELEASE\spring-boot-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.2.RELEASE\spring-boot-autoconfigure-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-starter-actuator\2.2.2.RELEASE\spring-boot-starter-actuator-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-actuator-autoconfigure\2.2.2.RELEASE\spring-boot-actuator-autoconfigure-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\boot\spring-boot-actuator\2.2.2.RELEASE\spring-boot-actuator-2.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\io\micrometer\micrometer-core\1.3.1\micrometer-core-1.3.1.jar;C:\Users\SCALASM\.m2\repository\org\hdrhistogram\HdrHistogram\2.1.11\HdrHistogram-2.1.11.jar;C:\Users\SCALASM\.m2\repository\org\latencyutils\LatencyUtils\2.0.3\LatencyUtils-2.0.3.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-core\5.2.2.RELEASE\spring-core-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\spring-jcl\5.2.2.RELEASE\spring-jcl-5.2.2.RELEASE.jar;C:\Users\SCALASM\.m2\repository\org\springframework\security\spring-security-core\5.2.1.RELEASE\spring-security-core-5.2.1.RELEASE.jar it.linksmt.sparkasse.configservice.ConfigServiceApplication
2020-01-28 10:56:47.534  INFO 3152 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.2.RELEASE)

2020-01-28 10:56:47.964  INFO 3152 --- [  restartedMain] i.l.s.c.ConfigServiceApplication         : No active profile set, falling back to default profiles: default
2020-01-28 10:56:48.603  INFO 3152 --- [  restartedMain] o.s.cloud.context.scope.GenericScope     : BeanFactory id=03c9d3b7-e94b-3aeb-af44-5a2b227f13dc
2020-01-28 10:56:49.081  INFO 3152 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8888 (http)
2020-01-28 10:56:49.088  INFO 3152 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-01-28 10:56:49.089  INFO 3152 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.29]
2020-01-28 10:56:49.180  INFO 3152 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-01-28 10:56:49.180  INFO 3152 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1206 ms
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/SCALASM/.m2/repository/org/springframework/spring-core/5.2.2.RELEASE/spring-core-5.2.2.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor.postProcessAfterInitialization(AbstractAdvisingBeanPostProcessor.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:431)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:885)
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:789)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:539)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338)
2020-01-28 10:56:49.520 DEBUG 3152 --- [  restartedMain] .s.c.c.s.s.GitCredentialsProviderFactory : Constructing UsernamePasswordCredentialsProvider for URI https://tools.linksmt.it/bitbucket/scm/linksdevops/sparkasse-config-env.git
2020-01-28 10:56:50.526  INFO 3152 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-01-28 10:56:50.726  INFO 3152 --- [  restartedMain] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@7de983f8, org.springframework.security.web.context.SecurityContextPersistenceFilter@4ddc0727, org.springframework.security.web.header.HeaderWriterFilter@5814bd49, org.springframework.security.web.csrf.CsrfFilter@3ed8fc21, org.springframework.security.web.authentication.logout.LogoutFilter@10f8e977, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@e36f2c2, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@288aefbe, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter@2d7a9c14, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@4f8f35b8, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@6d23652, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@7ee664d3, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@17f19ac8, org.springframework.security.web.session.SessionManagementFilter@6cd959ae, org.springframework.security.web.access.ExceptionTranslationFilter@78be4f96, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@1027dd28]
2020-01-28 10:56:50.754  INFO 3152 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2020-01-28 10:56:51.261  INFO 3152 --- [  restartedMain] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'

Comment From: scalasm

Updating to the latest spring boot 2.2.4 (with spring 5.2.3) did not change much:

2020-01-28 11:03:03.165  INFO 15308 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1189 ms
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/SCALASM/.m2/repository/org/springframework/spring-core/5.2.3.RELEASE/spring-core-5.2.3.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582)
...

Comment From: JPumpkin

I have same problem using Java 11(AWS Corretto 11) and SpringBoot 2.2.4 on Ubuntu 18.04

2020-02-14 11:42:21 [      main]  WARN io.undertow.websockets.jsr    - UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used 
2020-02-14 11:42:21 [      main]  INFO io.undertow.servlet           - Initializing Spring embedded WebApplicationContext 
2020-02-14 11:42:21 [      main]  INFO o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 576 ms 
2020-02-14 11:42:21 [      main]  INFO o.s.s.c.ThreadPoolTaskExecutor- Initializing ExecutorService 'applicationTaskExecutor' 
2020-02-14 11:42:22 [      main]  INFO io.undertow                   - starting server: Undertow - 2.0.29.Final 
2020-02-14 11:42:22 [      main]  INFO org.xnio                      - XNIO version 3.3.8.Final 
2020-02-14 11:42:22 [      main]  INFO org.xnio.nio                  - XNIO NIO Implementation Version 3.3.8.Final 
**WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.xnio.nio.NioXnio$2 (file:/home/jihopark/.m2/repository/org/jboss/xnio/xnio-nio/3.3.8.Final/xnio-nio-3.3.8.Final.jar) to constructor sun.nio.ch.EPollSelectorProvider()
WARNING: Please consider reporting this to the maintainers of org.xnio.nio.NioXnio$2
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release**
2020-02-14 11:42:22 [      main]  INFO w.e.u.UndertowServletWebServer- Undertow started on port(s) 19999 (http) with context path '' 

Comment From: tdevilleduc

Same problem with Java 11, SpringBoot 2.2.6.RELEASE

$ java -version java version "11.0.5" 2019-10-15 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.5+10-LTS) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.5+10-LTS, mixed mode)

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/devil/.m2/repository/org/springframework/spring-core/5.2.5.RELEASE/spring-core-5.2.5.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:533) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65) at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135) at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:216) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) at com.tdevilleduc.urthehero.back.filter.LogRequestFilter$$EnhancerBySpringCGLIB$$3914ce0b.init(<generated>) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:106) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4538) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5177) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)

Problem append only when I add Filter component

@Component
class LogRequestFilter : Filter {

    val logger: Logger = LoggerFactory.getLogger(LogRequestFilter::class.java)

    override fun doFilter(servletRequest: ServletRequest, servletResponse: ServletResponse, filterChain: FilterChain) {

        if (logger.isInfoEnabled) {
            val req = servletRequest as HttpServletRequest;
            logger.info(ApplicationConstants.CONTROLLER_CALL_LOG, req.requestURI)
        }
        filterChain.doFilter(servletRequest, servletResponse)
    }
}

https://github.com/tdevilleduc/urthehero/commit/a9cb53444d065f46ecb6624ecde6f0dba43bd2da

Comment From: soumi100

Solved

I have got the same warning and I googled it for 12 hours tried all possible codes and dependencies. actually the application will still run and without adding any code just make sure you call your application properly from the localhost to do so look at the application property and check this server.contextPath=/myapi localhost:8080/myapi

Comment From: shaunmccready

Just to possibly help out with info for this issue: I was in the process of creating a basic app and when I added the @Transactional annotation to a one particular method in a service class, this error popped up. I'm calling a different method in the same class that doesn't have the @Transactional annotation. If I remove the annotation and retry no error, so it has something to do with the proxying process of Spring when it extends the class in order to support the transaction.

I'm using Spring Boot 2.3.0.RELEASE with JDK 11.0.2

In the meantime, I followed this https://github.com/spring-projects/spring-framework/issues/23099#issuecomment-516100706 and now it doesn't show up in the console.

Comment From: steklopod

Maybe @SpringBootApplication(proxyBeanMethods = false) ?

Comment From: parikshitghosh3

What is the final solution for this as am also facing the same issue, anyone ?

Comment From: eliezerreis

Same issue here. Any news about it?

Comment From: iamprashant

Depends on your Java env

java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)

Then make sure you have

sourceCompatibility = 1.8
targetCompatibility = 1.8

Comment From: alan-czajkowski

similar problem here when running: mvn clean spring-boot:run

Spring Boot: 2.3.4.RELEASE Environment:

$ mvn -v
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec
Java version: 11.0.8, vendor: Amazon.com Inc., runtime: /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home
Default locale: en_CA, platform encoding: UTF-8
OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"

I'm trying to enable the Spring Boot LogFile Actuator, and so I have added this to my application config:

...
management:
  endpoints:
    web:
      exposure:
        include: "health, info, logfile"
...

application starts up fine with above config, until I add logging.file.name:

...
logging:
  file:
    name: "./target/logs/app.log"
management:
  endpoints:
    web:
      exposure:
        include: "health, info, logfile"
...

and then the application breaks (log4j2 stops working entirely) due to the JVM warnings:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.4.RELEASE)

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

when you add --illegal-access=debug to the JVM via Spring Boot Maven Plugin:

...
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
          <jvmArguments>--illegal-access=debug</jvmArguments>
...

this is the output:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.4.RELEASE)

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:533)
    at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
    at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
    at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
    at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
    at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65)
    at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135)
    at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:242)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
    at com.example.service.payment.config.PaymentI18nConfig$$EnhancerBySpringCGLIB$$dcbaed75.messageSource(<generated>)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207)
    at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:733)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:539)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)

Comment From: iamprashant

similar problem here when running: mvn clean spring-boot:run

Spring Boot: 2.3.4.RELEASE Environment:

$ mvn -v Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f) Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec Java version: 11.0.8, vendor: Amazon.com Inc., runtime: /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home Default locale: en_CA, platform encoding: UTF-8 OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"

I'm trying to enable the Spring Boot LogFile Actuator, and so I have added this to my application config:

... management: endpoints: web: exposure: include: "health, info, logfile" ...

application starts up fine with above config, until I add logging.file.name:

... logging: file: name: "./target/logs/app.log" management: endpoints: web: exposure: include: "health, info, logfile" ...

and then the application breaks (log4j2 stops working entirely) due to the JVM warnings:

`` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release ```

when you add --illegal-access=debug to the JVM via Spring Boot Maven Plugin:

... <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <jvmArguments>--illegal-access=debug</jvmArguments> ...

this is the output:

`` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:533) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65) at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135) at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76) at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:242) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) at com.example.service.payment.config.PaymentI18nConfig$$EnhancerBySpringCGLIB$$dcbaed75.messageSource() at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:733) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:539) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ```

Please provide your java version. java -version

Comment From: alan-czajkowski

similar problem here when running: mvn clean spring-boot:run Spring Boot: 2.3.4.RELEASE Environment: $ mvn -v Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f) Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec Java version: 11.0.8, vendor: Amazon.com Inc., runtime: /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home Default locale: en_CA, platform encoding: UTF-8 OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"

I'm trying to enable the Spring Boot LogFile Actuator, and so I have added this to my application config: ... management: endpoints: web: exposure: include: "health, info, logfile" ...

application starts up fine with above config, until I add logging.file.name: ... logging: file: name: "./target/logs/app.log" management: endpoints: web: exposure: include: "health, info, logfile" ...

and then the application breaks (log4j2 stops working entirely) due to the JVM warnings: `` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release ```

when you add --illegal-access=debug to the JVM via Spring Boot Maven Plugin: ... <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <jvmArguments>--illegal-access=debug</jvmArguments> ...

this is the output: `` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:533) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65) at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135) at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76) at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:242) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) at com.example.service.payment.config.PaymentI18nConfig$$EnhancerBySpringCGLIB$$dcbaed75.messageSource() at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:733) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:539) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ```

Please provide your java version. java -version

see my environment output at the beginning of my comment (mvn -v)

Comment From: iamprashant

similar problem here when running: mvn clean spring-boot:run Spring Boot: 2.3.4.RELEASE Environment: $ mvn -v Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f) Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec Java version: 11.0.8, vendor: Amazon.com Inc., runtime: /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home Default locale: en_CA, platform encoding: UTF-8 OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"

I'm trying to enable the Spring Boot LogFile Actuator, and so I have added this to my application config: ... management: endpoints: web: exposure: include: "health, info, logfile" ...

application starts up fine with above config, until I add logging.file.name: ... logging: file: name: "./target/logs/app.log" management: endpoints: web: exposure: include: "health, info, logfile" ...

and then the application breaks (log4j2 stops working entirely) due to the JVM warnings: `` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release ```

when you add --illegal-access=debug to the JVM via Spring Boot Maven Plugin: ... <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <jvmArguments>--illegal-access=debug</jvmArguments> ...

this is the output: `` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \ \/ )| |)| | | | | || (_| | ) ) ) ) ' || .__|| ||| |_, | / / / / =========|_|==============|/=///_/ :: Spring Boot :: (v2.3.4.RELEASE)

WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/Users/alan/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:533) at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) at org.springframework.cglib.reflect.FastClass$Generator.create(FastClass.java:65) at org.springframework.cglib.proxy.MethodProxy.helper(MethodProxy.java:135) at org.springframework.cglib.proxy.MethodProxy.init(MethodProxy.java:76) at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:242) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) at com.example.service.payment.config.PaymentI18nConfig$$EnhancerBySpringCGLIB$$dcbaed75.messageSource() at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:733) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:539) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ```

Please provide your java version. java -version

see my environment output at the beginning of my comment (mvn -v)

Use 1.8 (Java 8) Or define the version in pom.xml

<properties>
   <java.version>11</java.version>
</properties>

I have resolved it by downgrading java version to 1.8

Comment From: alan-czajkowski

@iamprashant sorry, but that is not a solution, I need Java 11 features and Java 11 is an LTS version, it should be supported

Comment From: iamprashant

@alan-czajkowski specify java version in your pom.xml, maven-compiler-plugin with source & target or release.

define this in your pom.xml

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <release>11</release>  <!--or <release>10</release>-->
    </configuration>
</plugin>

Comment From: LifeIsStrange

I am hitting this too on a very simple project, at startup, with a simple gradle using the latest stable spring dependencies.

Comment From: bclozel

@LifeIsStrange here's the reference to the issue you've created in Spring Boot: https://github.com/spring-projects/spring-boot/issues/24857

Comment From: alan-czajkowski

@iamprashant what have you provided that is a solution to this specific issue? specifying the JDK version in the compiler plugin is not a solution

Comment From: shaunmccready

@LifeIsStrange here's the reference to the issue you've created in Spring Boot: spring-projects/spring-boot#24857

I'm surprised that no ticket existed before 3 days ago. The original problem dates back almost 2 years ago and its pretty much existed since then.

Comment From: snicoll

An update. Spring Framework 5.3.4 has a fix for the ClassLoader under our control (the one used in devtools being one of those). We've reproduced the warning with devtools and using that fix removed the warning. For those who are having this issue when devtools is on the classpath, this is now superseded by https://github.com/spring-projects/spring-boot/issues/24857.

If you're not using devtools, an update with a recent Spring Boot version would be most welcome.

Comment From: jhoeller

As mentioned by Stephane, we're addressing a common cause - Spring Boot's RestartClassLoader as used in Boot DevTools - through #26403 and a corresponding revision in Boot itself, to be released in our February maintenance releases. This will make the warnings go away for DevTools setups in which pre-loaded classes from a lower ClassLoader are getting proxied.

Unfortunately the JDK's warning is not specific enough. The actual cause is specific to the application's setup and not really related to the core framework and its CGLIB fork. The debug stacktraces aren't very telling either, we'd rather need to know why the target ClassLoader for the proxy class is different from the ClassLoader that the original class is defined in. If those ClassLoaders differ, we have to fall back to ClassLoader.defineClass since there is no JDK 9+ replacement API for enforcing a class definition in a specific ClassLoader. As a consequence, we need to revisit the ClassLoader setup for each such scenario.

All past reporters here, thank you for your efforts so far. All further encounters, please do not post similar-looking stacktraces here anymore. We'd rather need debugging of the ClassLoader arrangement as discussed above, and a specific report to the project that causes the ClassLoader mismatch (that will typically be Spring Boot or Spring Cloud, not Spring Framework itself). At this point I'd also ask everyone to wait for the February releases and only report remaining warnings beyond that point. Alternatively, you may also deactivate DevTools and see whether the warnings disappear right away.

A known tough case is proxying for JDK library classes (such as HashMap or MBeanServer). This is currently always going to trigger a warning since we are not allowed to define a proxy class in the java.base module itself, so naturally have to choose a higher-level (and therefore differing) ClassLoader through the "illegal" API. There is no solution for this yet other than bootstrapping the JVM with --add-opens java.base/java.lang=ALL-UNNAMED, exposing ClassLoader.defineClass that way, which is also the only way to make such proxying of JDK library classes work with --illegal-access=deny at the moment.

Last but not least, please take such warnings with a grain of salt. A warning does not mean that startup will fail when illegal access is being denied. If our ClassLoader.defineClass attempt fails with an illegal access exception, we'll fall back to the JDK 9+ Lookup.defineClass API, accepting the ClassLoader mismatch. (If the ClassLoader is the same, we'll use the JDK 9+ API to begin with, not triggering a warning in any case.) So ironically, the warnings might go away once you switch to --illegal-access=deny, you'll just get an inconsistent ClassLoader setup; only for specific cases such as proxying JDK library classes, it'll fail completely.

Comment From: Mayank-rathi

I face Same Issue In My Case This Will Happen Due To old Jason Import File