1.异常现象
项目构建时，抛出异常 Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 15
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
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$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ecuserCustomerManager': Invocation of init method failed; nested exception is java.lang.RuntimeException: java.io.IOException: invalid constant type: 15
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:742)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
... 24 more
Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 15
at javassist.CtClassType.getClassFile2(CtClassType.java:204)
at javassist.CtClassType.subtypeOf(CtClassType.java:304)
at javassist.CtClassType.subtypeOf(CtClassType.java:319)
at javassist.compiler.MemberResolver.compareSignature(MemberResolver.java:248)
at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:120)
at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:97)
at javassist.compiler.TypeChecker.atMethodCallCore(TypeChecker.java:711)
at javassist.compiler.TypeChecker.atCallExpr(TypeChecker.java:688)
at javassist.compiler.JvstTypeChecker.atCallExpr(JvstTypeChecker.java:157)
at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)
at javassist.compiler.JvstTypeChecker.atCastToWrapper(JvstTypeChecker.java:126)
at javassist.compiler.JvstTypeChecker.atCastExpr(JvstTypeChecker.java:98)
at javassist.compiler.ast.CastExpr.accept(CastExpr.java:55)
at javassist.compiler.CodeGen.doTypeCheck(CodeGen.java:242)
at javassist.compiler.CodeGen.compileExpr(CodeGen.java:229)
at javassist.compiler.CodeGen.atReturnStmnt2(CodeGen.java:598)
at javassist.compiler.JvstCodeGen.atReturnStmnt(JvstCodeGen.java:425)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:363)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atIfStmnt(CodeGen.java:391)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:355)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.MemberCodeGen.atTryStmnt(MemberCodeGen.java:204)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:367)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:292)
at javassist.compiler.CodeGen.atMethodDecl(CodeGen.java:274)
at javassist.compiler.ast.MethodDecl.accept(MethodDecl.java:44)
at javassist.compiler.Javac.compileMethod(Javac.java:169)
at javassist.compiler.Javac.compile(Javac.java:95)
at javassist.CtNewMethod.make(CtNewMethod.java:74)
at javassist.CtNewMethod.make(CtNewMethod.java:45)
at com.alibaba.dubbo.common.bytecode.ClassGenerator.toClass(ClassGenerator.java:318)
at com.alibaba.dubbo.common.bytecode.Wrapper.makeWrapper(Wrapper.java:346)
at com.alibaba.dubbo.common.bytecode.Wrapper.getWrapper(Wrapper.java:89)
at com.alibaba.dubbo.config.ReferenceConfig.checkAndLoadConfig(ReferenceConfig.java:268)
at com.alibaba.dubbo.config.spring.ReferenceBean.afterPropertiesSet(ReferenceBean.java:168)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 39 more
Caused by: java.io.IOException: invalid constant type: 15
at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113)
at javassist.bytecode.ConstPool.read(ConstPool.java:1056)
at javassist.bytecode.ConstPool.<init>(ConstPool.java:150)
at javassist.bytecode.ClassFile.read(ClassFile.java:765)
at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)
at javassist.CtClassType.getClassFile2(CtClassType.java:191)
... 83 more 2.排查分析
2.1. Maven 依赖的 javassist 包版本过低导致
2.2. 据开发者透露，Java 8 的最新更新版本 update 11 导致了一些第三方工具不兼容问题。
原因在于，Java 8u11 中的 JVM 字节码验证子系统发生变化而导致的。Java 语言要求任何调用超类构造函数必须在第一次调用时进行，但 Java 早期版本中的字节码验证器并没有强制去验证，甲骨文公司开始考虑解决这一问题，但目前来看似乎影响了一些第三方工具。
其中受影响的工具包括 JavaEE 开发工具 JRebel、Java 字节码操作库 Javassist、依赖注入框架 Google Guice、代码覆盖工具 Jacoco 等，此外，Groovy 编程语言也被报告不兼容。
3.解决方案
方案一）javassist 依赖版本升级
跟其他技术贴一样，升级 javassist 依赖版本解决：
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.24.1-GA</version>
</dependency> 方案二）依赖冲突检查和清理
检查一下项目中是否有其他组织的 javassist 包依赖冲突。如下图，在项目某模块的 pom.xml 上右键菜单，Diagrams > Show Dependencies 后，搜索 java 关键字，出现了两个 javassist 依赖包：
这两个相同包名的 Javassist，一个是 groupId 为 Javassist 的版本，一个是 groupId 为 org.javassist 的版本。通过清理依赖冲突解决 java.io.IOException: invalid constant type: 15
a）自动排除：选中要排除的 Javassist 包，右键 Exclude 掉
b）手动排除：可能不好找到对应的 dependency
<exclusions>
<exclusion>
<artifactId>javassist</artifactId>
<groupId>javassist</groupId>
</exclusion>
</exclusions>