獲取 java.rmi.RemoteException：EJB 異常即使類路徑、XML、Bean 已正確定義和部署

Question

我在調試這個問題時遇到了麻煩。 我正在將我的代碼從 Java 1.4 遷移到 JDK 6，將 Weblogic 8.1.5 遷移到 Weblogic 10.3。 我已經使用 weblogic 的 DDConverver 實用程序轉換了 EJB 的部署描述符。 Beans 由無狀態會話和實體 bean (2.1) 組成。 應用程序以JSP 為前端，EJB 為中間件。 在記錄時，我正在調用一個內部調用實體 bean 並加載相同的會話 bean。 當會話 bean 調用實體 bean 時，我得到以下異常。 會話調用成功，唯一的問題是來自會話 bean 的實體調用。

我正在為此使用開發環境。 JSP 存儲在 C:\MisasiaAppln10.3_DEV\misasia\autodeploy\misasia EJB 部署在 C:\MisasiaAppln10.3_DEV\misasia\servers\AdminServer\upload

異常詳情：

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

示例代碼：
從 JSP 調用會話（這很好）

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(); 

會話中的實體調用（失敗）

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/misasia/admin/setupmaster/SetupMasterHome

表示在執行 ControlBean 的SetupMasterHome.class方法時， server/module類路徑中缺少loadSetupMaster 。 添加適當的jar將解決問題。