[STS/스프링에러] Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass 해결

Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @1796cf6c

 

1. AOP 패러다임을 공부하며 AOP 테스트를 실행하려는데 아래와 같은 에러 코드를 만났다. 파일 내 코드 오타, pom.xml 내 라이브러리 설정과 같은 문제는 전혀 없었다.

 

INFO : org.springframework.test.context.support.DefaultTestContextBootstrapper - Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener]
INFO : org.springframework.test.context.support.DefaultTestContextBootstrapper - Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@35a50a4c, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@1f021e6c, org.springframework.test.context.support.DependencyInjectionTestExecutionListener@103f852, org.springframework.test.context.support.DirtiesContextTestExecutionListener@587c290d]
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from URL [file:src/main/webapp/WEB-INF/spring/root-context.xml]
INFO : org.springframework.context.support.GenericApplicationContext - Refreshing org.springframework.context.support.GenericApplicationContext@19dc67c2: startup date [Mon Mar 07 12:25:01 KST 2022]; root of context hierarchy
INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
ERROR: org.springframework.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@103f852] to prepare test instance [org.zerock.service.SampleServiceTests@cc6460c]
org.springframework.aop.framework.AopConfigException: Unexpected AOP exception; nested exception is java.lang.ExceptionInInitializerError
	at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:214)
	at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:473)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:355)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:304)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:439)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1712)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:415)
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:119)
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:93)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:529)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:756)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:452)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
Caused by: java.lang.ExceptionInInitializerError
	at org.springframework.aop.framework.CglibAopProxy.createEnhancer(CglibAopProxy.java:231)
	at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:181)
	... 31 more
Caused by: org.springframework.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @1796cf6c
	at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:464)
	at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:336)
	at org.springframework.cglib.core.AbstractClassGenerator$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$2.call(LoadingCache.java:54)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
	at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java: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)
	... 33 more
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @1796cf6c
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at org.springframework.cglib.core.ReflectUtils$1.run(ReflectUtils.java:61)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
	at org.springframework.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:52)
	at org.springframework.cglib.core.KeyFactory$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)
	... 45 more
INFO : org.springframework.context.support.GenericApplicationContext - Closing org.springframework.context.support.GenericApplicationContext@19dc67c2: startup date [Mon Mar 07 12:25:01 KST 2022]; root of context hierarchy

 

에러 해석 및 구글링 결과 흔한 java.lang.Class 빌드 문제라고 하는데 보통 lombok 라이브러리 사용 시 이런 문제가 많이 발생한다고 하였다. lombok에서 1.18.22 버전에서는 이 문제를 해결하였다고 하는데, 나는 실습 시 계속 lombok 버전 1.18.22를 사용해왔고 이전 프로젝트나 실습에서는 전혀 문제가 없었기 때문에 이 에러를 처음 본 것이라 꽤 당황스러웠다.

 

2. 해결

--add-opens=java.base/java.lang=ALL-UNNAMED

STS 내 Window > Preferences > Installed JRES 로 들어가서 Java SE 17.0.1 (내가 현재 사용하고 있는 자바 버전)을 선택하고 Edit을 클릭해 위의 코드를 추가해주었다. 

 

3. 그 결과 아래와 같이 에러가 사라지고 정상적으로 테스트가 실행되었다. 

도움 받은 블로그 출처: https://shanepark.tistory.com/205 

https://shanepark.tistory.com/205