[Weblogic] 最近碰到的 Weblogic issue

這兩天一直碰到一個奇怪的問題。狀況是這樣的，我有兩個系統一個在 Weblogic 一個在 Tomcat，每次 Tomcat 上的系統要查詢時都會透過 HttpInvoker 去跟 Weblogic 要資料，這其實沒什麼太大的問題。但是碰到一個很奇怪的現象就是，當在 Weblogic 查資料後，之後透過 HttpInvoker 去查詢的都會失敗，去看 Weblogic 完整的 Exception stack log 如下。

[2013-04-29 14:30:14,672][ERROR][te.test.httpinvoker.MfHttpInvokerServiceImpl.selectExecQueryReportType02CountBy] java.lang.NullPointerException
 at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.initSessionInfo(ServletRequestImpl.java:2611)
 at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSessionInternal(ServletRequestImpl.java:2379)
 at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession(ServletRequestImpl.java:2369)
 at weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.java:1285)
 at weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.java:1281)
 at te.common.helper.UserSessionHelper.getUserData(UserSessionHelper.java:37)
 at te.common.helper.EnvFacadeHelper.isNeedLogging(EnvFacadeHelper.java:165)
 at te.common.aop.QueryLogBeforeAdvice.doQueryLog(QueryLogBeforeAdvice.java:50)
 at sun.reflect.GeneratedMethodAccessor427.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
 at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:603)
 at org.springframework.aop.aspectj.AspectJMethodBeforeAdvice.before(AspectJMethodBeforeAdvice.java:39)
 at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:49)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
 at $Proxy282.selectExecQueryReportType02CountBy(Unknown Source)
 at te.test.services.ExecQueryService.selectExecQueryReportType02CountBy(ExecQueryService.java:891)
 at te.test.services.ExecQueryService$$FastClassByCGLIB$$192bb3.invoke()
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
 at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
 at te.test.services.ExecQueryService$$EnhancerByCGLIB$$724f2dd3.selectExecQueryReportType02CountBy()
 at te.test.httpinvoker.MfHttpInvokerServiceImpl.selectExecQueryReportType02CountBy(MfHttpInvokerServiceImpl.java:58)
 at sun.reflect.GeneratedMethodAccessor510.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
 at org.springframework.remoting.support.RemoteInvocationTraceInterceptor.invoke(RemoteInvocationTraceInterceptor.java:77)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
 at $Proxy292.selectExecQueryReportType02CountBy(Unknown Source)
 at sun.reflect.GeneratedMethodAccessor509.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.springframework.remoting.support.RemoteInvocation.invoke(RemoteInvocation.java:205)
 at org.springframework.remoting.support.DefaultRemoteInvocationExecutor.invoke(DefaultRemoteInvocationExecutor.java:38)
 at org.springframework.remoting.support.RemoteInvocationBasedExporter.invoke(RemoteInvocationBasedExporter.java:78)
 at org.springframework.remoting.support.RemoteInvocationBasedExporter.invokeAndCreateResult(RemoteInvocationBasedExporter.java:114)
 at org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter.handleRequest(HttpInvokerServiceExporter.java:73)
 at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49)
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
 at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
 at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
 at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
 at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

最後請到 Google 大神，有人說將 Weblogic 的 keep alive 關掉就可以了，實際關掉後也確實解決了問題。給一樣有遇到這個奇怪問題的人一個參考。