NoClassDefFoundError：无法在应用程序服务器上实例化类，在本地工作正常(NoClassDefFoundError: Can't instantiate class on a

NoClassDefFoundError：无法在应用程序服务器上实例化类，在本地工作正常(NoClassDefFoundError: Can't instantiate class on application server, works fine locally)

我在WebLogic上运行了一个包含ejb的耳朵。所有都运行良好，直到ejb尝试实例化ServiceFactory的对象 - 我们自己的类之一。

在我的单元测试中，我可以在本地创建该类的对象。服务器上发生错误。

我猜这可能是构建/打包问题或WebLogic 10.3.6怪癖，但由于依赖存在于耳中（在APP-INF / lib中），因此不知道从何处开始。我也尝试将包含类的依赖项移动到耳朵的根部。对于ejb和ear，MANIFEST.MF文件中的“Class-Path：”为空白，但产品运行正常，直到现在没有它们。我正和Maven一起建设。

javax.ejb.EJBException: what do i do: seems an odd quirk of the EJB spec. The exception is:java.lang.NoClassDefFoundError: Could not initialize class com.company.ts.management.icm.service.ServiceFactory at com.oracle.pitchfork.intercept.MethodInvocationInvocationContext.proceed(MethodInvocationInvocationContext.java:110) at com.company.it.techservices.aae.service.CommonService.bizLog(CommonService.java:37) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310) at com.oracle.pitchfork.intercept.JeeInterceptorInterceptor.invoke(JeeInterceptorInterceptor.java:68) at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131) at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119) at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at com.oracle.pitchfork.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:34) at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:54) at com.oracle.pitchfork.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:42) at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at com.bea.core.repackaged.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131) at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119) at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at com.sun.proxy.$Proxy476.calculateRoles(Unknown Source) at com.company.it.techservices.aae.autheng.AuthorizationEngineBean_t79b4w_AuthorizationEngineBeanRemoteImpl.__WL_invoke(Unknown Source) at weblogic.ejb.container.internal.SessionRemoteMethodInvoker.invoke(SessionRemoteMethodInvoker.java:40) at com.company.it.techservices.aae.autheng.AuthorizationEngineBean_t79b4w_AuthorizationEngineBeanRemoteImpl.calculateRoles(Unknown Source) at com.company.it.techservices.aae.autheng.AuthorizationEngineBean_t79b4w_AuthorizationEngineBeanRemoteImpl_WLSkel.invoke(Unknown Source) at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:667) at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230) at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:522) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:146) at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:518) at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256) at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

I have an ear running on WebLogic that contains an ejb. All runs well until the ejb tries to instantiate an object of ServiceFactory - one of our own classes.

In my unit tests, I could create an object of the class locally. It's on the server that the error occurs.

I'm guessing this is either a build/packaging issue or a WebLogic 10.3.6 quirk but don't know where to proceed from here given that the dependency exists in the ear (in APP-INF/lib). I've also tried moving the dependency that contains the class to the root of the ear. "Class-Path: " is blank in the MANIFEST.MF file for the ejb and the ear, but the product has run fine until now without them. I'm building with Maven.

最满意答案

通常， NoClassDefFoundError意味着可能找到了类但无法初始化。因此，该类的代码中的某些内容在实例化时会抛出错误（这可能意味着完全缺少不同的类）。

检查您班级的代码。具体来说，查找静态块或使用ClassLoader未找到的类的成员。

In general NoClassDefFoundError means the class was probably found but could not initialize. So something in the code for that class throws an error when it is instantiated (it could mean a different class entirely is missing).

Check the code for your class. Specifically look for static blocks or members which use a class that's not found by the ClassLoader.

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