`RepositoryEntityController` is incompatible with devtools

[muliyul]

Cannot run application with devtools org.springframework.boot:spring-boot-devtools

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'repositoryEntityController' defined in class path resource [org/springframework/data/rest/webmvc/RestControllerConfiguration.class]: Could not generate CGLIB subclass of class org.springframework.data.rest.webmvc.RepositoryEntityController: Common causes of this problem include using a final class or a non-visible class

Seems like RepositoryEntityController is non-visible (no public modifier).

[mp911de]

Can you post the full stack trace (i.e. non-truncated)? We have quite a few package-protected types. I do not see why proxying would be necessary in a developer-facing project as you're not going to update these types.

[muliyul]

2024-12-02T15:34:06.263+02:00 ERROR 24868 --- [SharedSpot] [  restartedMain] [                                                 ] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'repositoryEntityController' defined in class path resource [org/springframework/data/rest/webmvc/RestControllerConfiguration.class]: Could not generate CGLIB subclass of class org.springframework.data.rest.webmvc.RepositoryEntityController: Common causes of this problem include using a final class or a non-visible class
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:608) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:523) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:336) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:288) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:334) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.instantiateSingleton(DefaultListableBeanFactory.java:1122) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingleton(DefaultListableBeanFactory.java:1093) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:1030) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:987) ~[spring-context-6.2.0.jar:6.2.0]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:627) ~[spring-context-6.2.0.jar:6.2.0]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.4.0.jar:3.4.0]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) ~[spring-boot-3.4.0.jar:3.4.0]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439) ~[spring-boot-3.4.0.jar:3.4.0]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318) ~[spring-boot-3.4.0.jar:3.4.0]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361) ~[spring-boot-3.4.0.jar:3.4.0]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350) ~[spring-boot-3.4.0.jar:3.4.0]
	at com.muliyul.sharedspot.SharedSpotApplicationKt.main(SharedSpotApplication.kt:28) ~[main/:na]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.4.0.jar:3.4.0]
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class org.springframework.data.rest.webmvc.RepositoryEntityController: Common causes of this problem include using a final class or a non-visible class
	at org.springframework.aop.framework.CglibAopProxy.buildProxy(CglibAopProxy.java:237) ~[spring-aop-6.2.0.jar:6.2.0]
	at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:167) ~[spring-aop-6.2.0.jar:6.2.0]
	at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110) ~[spring-aop-6.2.0.jar:6.2.0]
	at org.springframework.modulith.observability.ModuleTracingSupport.addAdvisor(ModuleTracingSupport.java:60) ~[spring-modulith-observability-1.3.0.jar:1.3.0]
	at org.springframework.modulith.observability.SpringDataRestModuleTracingBeanPostProcessor.postProcessAfterInitialization(SpringDataRestModuleTracingBeanPostProcessor.java:77) ~[spring-modulith-observability-1.3.0.jar:1.3.0]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:439) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1805) ~[spring-beans-6.2.0.jar:6.2.0]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-6.2.0.jar:6.2.0]
	... 20 common frames omitted
Caused by: org.springframework.cglib.core.CodeGenerationException: java.lang.IllegalAccessError-->class org.springframework.data.rest.webmvc.RepositoryEntityController$$SpringCGLIB$$0 cannot access its superclass org.springframework.data.rest.webmvc.RepositoryEntityController (org.springframework.data.rest.webmvc.RepositoryEntityController$$SpringCGLIB$$0 is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @422634da; org.springframework.data.rest.webmvc.RepositoryEntityController is in unnamed module of loader 'app')
	at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:490) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:371) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:575) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.lambda$new$1(AbstractClassGenerator.java:107) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.internal.LoadingCache.lambda$createEntry$1(LoadingCache.java:52) ~[spring-core-6.2.0.jar:6.2.0]
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[na:na]
	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:57) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:130) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:317) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:562) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:407) ~[spring-core-6.2.0.jar:6.2.0]
	at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:62) ~[spring-aop-6.2.0.jar:6.2.0]
	at org.springframework.aop.framework.CglibAopProxy.buildProxy(CglibAopProxy.java:228) ~[spring-aop-6.2.0.jar:6.2.0]
	... 27 common frames omitted
Caused by: java.lang.IllegalAccessError: class org.springframework.data.rest.webmvc.RepositoryEntityController$$SpringCGLIB$$0 cannot access its superclass org.springframework.data.rest.webmvc.RepositoryEntityController (org.springframework.data.rest.webmvc.RepositoryEntityController$$SpringCGLIB$$0 is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @422634da; org.springframework.data.rest.webmvc.RepositoryEntityController is in unnamed module of loader 'app')
	at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[na:na]
	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.publicDefineClass(RestartClassLoader.java:147) ~[spring-boot-devtools-3.4.0.jar:3.4.0]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
	at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:486) ~[spring-core-6.2.0.jar:6.2.0]
	... 40 common frames omitted


Process finished with exit code 0

[mp911de]

Paging @odrotbohm @marcingrzejszczak

[marcingrzejszczak]

Is this the problem with the 1.3.0 version? We've migrated tracing support to observability based support (although that logic with cglib proxies might not have been changed)

[odrotbohm]

I got this fixed by registering both Spring Data REST WebMVC and HAL Explorer to be included in the application classloader as documented here. I'll consult the Boot team to better understand why that is.