获取 java.rmi.RemoteException：EJB 异常 即使类路径、XML、Bean 已正确定义和部署

Question

我在调试这个问题时遇到了麻烦。我正在将代码从 Java 1.4 迁移到 JDK 6，将 Weblogic 8.1.5 迁移到 Weblogic 10.3。我已经使用 weblogic 的 DDConverver 实用程序转换了 EJB 的部署描述符。 Bean 由无状态会话和实体 Bean (2.1) 组成。应用程序由JSP作为前端和EJB作为中间件组成。在记录时，我正在调用一个会话 bean，该会话 bean 在内部调用实体 bean 并加载相同的实体 bean。当会话 bean 调用实体 bean 时，我收到以下异常。会话调用成功，唯一的问题是来自会话 bean 的实体调用。

我正在为此使用开发环境。 JSP 存储在 C:\MisasiaAppln10.3_DEV\misasia\autodeploy\misasia EJB 部署在 C:\MisasiaAppln10.3_DEV\misasia\servers\AdminServer\upload

异常详细信息：

java.rmi.RemoteException: EJB Exception: ; nested exception is:
        java.lang.NoClassDefFoundError: com/misasia/admin/setupmaster/SetupMasterHome
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:205)
        at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:222)
        at com.misasia.admin.ctrlsession.controlSession_ho24d0_EOImpl_1030_WLStub.login(Unknown Source)
        at jsp_servlet.__index._jspService(__index.java:197)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
        at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:408)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:318)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3498)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(Unknown Source)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.NoClassDefFoundError: com/misasia/admin/setupmaster/SetupMasterHome
        at com.misasia.admin.ctrlsession.controlBean.loadSetupMaster(controlBean.java:149)
        at com.misasia.admin.ctrlsession.controlBean.login(controlBean.java:119)
        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 com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:281)
        at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:187)
        at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:154)
        at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:126)
        at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:114)
        at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)
        at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:15)
        at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:54)
        at com.bea.core.repackaged.springframework.jee.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:30)
        at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)
        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:176)
        at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:126)
        at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:114)
        at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)
        at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:210)
        at $Proxy60.login(Unknown Source)
        at com.misasia.admin.ctrlsession.controlSession_ho24d0_EOImpl.login(controlSession_ho24d0_EOImpl.java:840)
        at com.misasia.admin.ctrlsession.controlSession_ho24d0_EOImpl_WLSkel.invoke(Unknown Source)
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:172)
        ... 18 more
Caused by: java.lang.ClassNotFoundException: com.misasia.admin.setupmaster.SetupMasterHome
        at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
        at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        ... 44 more

示例代码：
从 JSP 调用会话（这工作正常）

env.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
env.put(Context.PROVIDER_URL, "t3://localhost:7001");
ic = new InitialContext(env);
ctrlHome = (controlHome)ic.lookup("controlSessionEJB");
ctrl = (control)ctrlHome.create(); 

从会话调用实体（这失败）

Object refsetup = ic.lookup("java:comp/env/ejb/SetupMasterEJB");
// This is the line which gives an error
SetupMasterHome setuph = (SetupMasterHome)PortableRemoteObject.narrow(refsetup, SetupMasterHome.class); 

Answer 1

java.lang.NoClassDefFoundError：
com/missasia/admin/setupmaster/SetupMasterHome

意味着在执行 ControlBean 的 loadSetupMaster 方法时，server/module 类路径中缺少 SetupMasterHome.class。添加适当的jar即可解决问题。