SpringBoot Gradle tests fail with OOM error when trying to run multiple integration tests

Hi,

I am facing a weird problem that I am unable to debug or understand why is it manifesting.

When I am running my integration tests using ./gradlew test after a few integration tests I am ending up with an OOM error like the following:

    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5074947c': Cannot create inner bean '(inner bean)#4239f98f' of type [org.springframework.beans.factory.config.PropertiesFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#4239f98f': Post-processing of FactoryBean's object failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [java.util.Hashtable] from ClassLoader [null]
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:389)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:134)
        at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:693)
        at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:198)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1354)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:374)
        ... 149 more
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#4239f98f': Post-processing of FactoryBean's object failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [java.util.Hashtable] from ClassLoader [null]
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:141)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:377)
        ... 157 more
    Caused by: java.lang.IllegalStateException: Failed to introspect Class [java.util.Hashtable] from ClassLoader [null]
        at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481)
        at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:358)
        at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:371)
        at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:414)
        at org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.postProcessAfterInitialization(StreamListenerAnnotationBeanPostProcessor.java:193)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:437)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.postProcessObjectFromFactoryBean(AbstractAutowireCapableBeanFactory.java:1929)
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:138)
        ... 158 more
    Caused by: java.lang.OutOfMemoryError: Java heap space
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is java.lang.OutOfMemoryError: Java heap space
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:338)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
    ... 107 more
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is java.lang.OutOfMemoryError: Java heap space
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
    ... 125 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.base/java.util.jar.JarFile.getBytes(JarFile.java:806)
    at java.base/java.util.jar.JarFile.checkForSpecialAttributes(JarFile.java:1007)
    at java.base/java.util.jar.JarFile.isMultiRelease(JarFile.java:390)
    at java.base/java.util.jar.JarFile.getEntry(JarFile.java:509)
    at java.base/sun.net.www.protocol.jar.URLJarFile.getEntry(URLJarFile.java:131)
    at java.base/sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:137)
    at java.base/sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:155)
    at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.parse(ServiceLoader.java:1165)
    at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1206)
    at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1221)
    at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1265)
    at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1300)
    at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1385)
    at java.xml/javax.xml.stream.FactoryFinder$1.run(FactoryFinder.java:348)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.xml/javax.xml.stream.FactoryFinder.findServiceProvider(FactoryFinder.java:337)
    at java.xml/javax.xml.stream.FactoryFinder.find(FactoryFinder.java:309)
    at java.xml/javax.xml.stream.FactoryFinder.find(FactoryFinder.java:222)
    at java.xml/javax.xml.stream.XMLOutputFactory.newInstance(XMLOutputFactory.java:138)
    at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:120)
    at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:100)
    at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:91)
    at com.fasterxml.jackson.dataformat.xml.XmlMapper.<init>(XmlMapper.java:140)
    at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder$XmlObjectMapperInitializer.create(Jackson2ObjectMapperBuilder.java:914)
    at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.build(Jackson2ObjectMapperBuilder.java:673)
    at org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter.<init>(MappingJackson2XmlHttpMessageConverter.java:52)
    at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.<init>(AllEncompassingFormHttpMessageConverter.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.<init>(RequestMappingHandlerAdapter.java:215)
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.createRequestMappingHandlerAdapter(WebMvcConfigurationSupport.java:702)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration.createRequestMappingHandlerAdapter(WebMvcAutoConfiguration.java:438)
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.requestMappingHandlerAdapter(WebMvcConfigurationSupport.java:671)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration.requestMappingHandlerAdapter(WebMvcAutoConfiguration.java:423)

My integration tests are annotated in the following way:

@ExtendWith(SpringExtension.class)
@SpringBootTest
@AutoConfigureMockMvc
@ActiveProfiles("test")

I want to know any way how I can debug this issue. If I run my tests individually they all pass, it is only when I run them using ./gradlew tests is when it fails.

I have tried using @DirtiesContext but it has no effect.

Before a test run's I have no idea of the code that the framework run's beforehand to setup everything.

Any ideas ?

Comment From: snicoll

Thanks for getting in touch, but it feels like this is a question that would be better suited to Stack Overflow. As mentioned in the guidelines for contributing, we prefer to use GitHub issues only for bugs and enhancements. Feel free to update this issue with a link to the re-posted question (so that other people can find it) or add some more details if you feel this is a genuine bug.