Spring illegal reflective access on SpringBoot 2.1.2

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access using Lookup on org.springframework.cglib.core.ReflectUtils (file:/home/user/.m2/repository/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar) to class java.lang.Object 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

Spring boot : 2.1.2 java : OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.5+10)

Comment From: bclozel

Closing as a duplicate of #22674, see this comment for more details.

Comment From: buckett

You should read the linked comment @bclozel mentioned, https://github.com/spring-projects/spring-framework/issues/22674#issuecomment-589116539 . If you have a Spring Boot application and have enabled devtools using an optional dependency:

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>

Then running the application while in development (mvn spring-boot:run or through the IDE) will cause this dependency to be on the classpath and you will see this warning, however when you build a JAR/WAR for production, this dependency is not pulled in and so you won't see this warning in production.