java.lang.IllegalStateException: Cannot load configuration class: org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature

Spring JIRA | Chris Beams | 6 years ago
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    Example: processing the following nested {{private}} class {code} @Configuration private static class MvcDefaultServletHandlerFeature { @SuppressWarnings("unused") @Feature public MvcDefaultServletHandler defaultServletHandler() { return new MvcDefaultServletHandler("foo"); } } {code} results in the following stack trace: {code} java.lang.IllegalStateException: Cannot load configuration class: org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:363) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigurationClasses(ConfigurationClassPostProcessor.java:197) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:170) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:604) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:437) at org.springframework.web.servlet.config.MvcDefaultServletHandlerTests.testDefaultServletHandler(MvcDefaultServletHandlerTests.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.IllegalArgumentException: No visible constructors in class org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature at net.sf.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531) at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:448) at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216) at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377) at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317) at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:127) at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:97) at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:355) ... 27 more {code} This is because CGLIB subclassing is required even for {{@Configuration}} classes that declare no {{@Bean}} methods. The user is forced to make the class non-{{private}} to work around this.

    Spring JIRA | 6 years ago | Chris Beams
    java.lang.IllegalStateException: Cannot load configuration class: org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature
  2. 0

    Example: processing the following nested {{private}} class {code} @Configuration private static class MvcDefaultServletHandlerFeature { @SuppressWarnings("unused") @Feature public MvcDefaultServletHandler defaultServletHandler() { return new MvcDefaultServletHandler("foo"); } } {code} results in the following stack trace: {code} java.lang.IllegalStateException: Cannot load configuration class: org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:363) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigurationClasses(ConfigurationClassPostProcessor.java:197) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:170) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:604) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:437) at org.springframework.web.servlet.config.MvcDefaultServletHandlerTests.testDefaultServletHandler(MvcDefaultServletHandlerTests.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.IllegalArgumentException: No visible constructors in class org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature at net.sf.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531) at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:448) at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216) at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377) at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317) at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:127) at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:97) at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:355) ... 27 more {code} This is because CGLIB subclassing is required even for {{@Configuration}} classes that declare no {{@Bean}} methods. The user is forced to make the class non-{{private}} to work around this.

    Spring JIRA | 6 years ago | Chris Beams
    java.lang.IllegalStateException: Cannot load configuration class: org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature
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Root Cause Analysis

  1. java.lang.IllegalArgumentException

    No visible constructors in class org.springframework.web.servlet.config.MvcDefaultServletHandlerTests$MvcDefaultServletHandlerFeature

    at net.sf.cglib.proxy.Enhancer.filterConstructors()
  2. IDEA
    Enhancer.generateClass
    1. net.sf.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531)
    2. net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:448)
    2 frames
  3. Code Generation Library
    AbstractClassGenerator.create
    1. net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    2. net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    2 frames
  4. IDEA
    Enhancer.createClass
    1. net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    2. net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
    2 frames
  5. Spring Context
    AbstractApplicationContext.refresh
    1. org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:127)
    2. org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:97)
    3. org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:355)
    4. org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigurationClasses(ConfigurationClassPostProcessor.java:197)
    5. org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:170)
    6. org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:604)
    7. org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:437)
    7 frames
  6. Spring MVC
    MvcDefaultServletHandlerTests.testDefaultServletHandler
    1. org.springframework.web.servlet.config.MvcDefaultServletHandlerTests.testDefaultServletHandler(MvcDefaultServletHandlerTests.java:40)
    1 frame
  7. Java RT
    Method.invoke
    1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    4. java.lang.reflect.Method.invoke(Method.java:597)
    4 frames
  8. JUnit
    ParentRunner.run
    1. org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    2. org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    3. org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    4. org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    5. org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    6. org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    7. org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    8. org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    9. org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    10. org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    11. org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    12. org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    12 frames
  9. JUnit4 Runner
    JUnit4TestReference.run
    1. org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    1 frame
  10. JUnit3 Runner
    RemoteTestRunner.main
    1. org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    2. org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    3. org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    4. org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    5. org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
    5 frames