P6 Application Becomes Unresponsive and the Managed Server Shows Stuck/Hogging Threads (Doc ID 2069369.1)

Last updated on MARCH 22, 2022

Applies to:

Symptoms

When navigating or loading applets/views in P6 Web, the server becomes unresponsive.  Reviewing the Threads fo rthe P6 managed server (Monitoring > Threads tab for the Managed Server in the WebLogic Administration Console), the server displays "hogging threads".

In the managed server log file, the following errors are written:

####<TIMESTAMP> <Error> <Socket> <SERVERNAME> <P6> <ExecuteThread: '0' for queue: 'weblogic.socket.Muxer'> <> <> <> <1444724524578> <BEA-000405> <Uncaught Throwable in processSockets
java.lang.NullPointerException
at weblogic.servlet.logging.CLFLogger.log(CLFLogger.java:86)
at weblogic.servlet.logging.LogManagerHttp.log(LogManagerHttp.java:110)
at weblogic.servlet.internal.HttpConnectionHandler.send400Response(HttpConnectionHandler.java:543)
at weblogic.servlet.internal.HttpConnectionHandler.dispatch(HttpConnectionHandler.java:618)
at weblogic.servlet.internal.MuxableSocketHTTP.dispatch(MuxableSocketHTTP.java:131)
at weblogic.socket.JSSEFilterImpl.dispatch(JSSEFilterImpl.java:216)
at weblogic.socket.MuxableSocketDiscriminator.dispatch(MuxableSocketDiscriminator.java:186)
at weblogic.socket.JSSEFilterImpl.dispatch(JSSEFilterImpl.java:216)
at weblogic.socket.SocketMuxer.readReadySocketOnce(SocketMuxer.java:970)
at weblogic.socket.SocketMuxer.readReadySocket(SocketMuxer.java:907)
at weblogic.socket.NIOSocketMuxer.process(NIOSocketMuxer.java:495)
at weblogic.socket.NIOSocketMuxer.processSockets(NIOSocketMuxer.java:461)
at weblogic.socket.SocketReaderRequest.run(SocketReaderRequest.java:30)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:43)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:147)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:119)

A thread dump taken from the WebLogic Administration Console while the hogging sessions are active includes the following error:

"[ACTIVE] ExecuteThread: '6' for queue: 'weblogic.kernel.Default (self-tuning)'" Id=210333 BLOCKED on org.apache.log4j.Logger@7784817e owned by "PrmThread-6" Id=72
  at org.apache.log4j.Category.callAppenders(Category.java:185)
  - blocked on org.apache.log4j.Logger@7784817e
  at org.apache.log4j.Category.forcedLog(Category.java:372)
  at org.apache.log4j.Category.log(Category.java:864)
  at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133)
  at com.primavera.infr.log.CommonsLoggingAdapter.info(Unknown Source)
  at com.primavera.pvweb.listeners.PVSessionListener.sessionCreated(Unknown Source)
  at weblogic.servlet.internal.EventsManager.notifySessionCreatedEvent(EventsManager.java:308)
  at weblogic.servlet.internal.EventsManager.notifySessionLifetimeEvent(EventsManager.java:330)
  at weblogic.servlet.internal.session.MemorySessionData.(MemorySessionData.java:10)
  at weblogic.servlet.internal.session.MemorySessionContext.getNewSession(MemorySessionContext.java:21)
  at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getNewSession(ServletRequestImpl.java:3274)
  at weblogic.servlet.internal.ServletRequestImpl$SessionHelper._getSessionInternal(ServletRequestImpl.java:2746)
  at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSessionInternal(ServletRequestImpl.java:2702)
  at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession(ServletRequestImpl.java:2692)
  at weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.java:1401)
  at weblogic.servlet.internal.ServletRequestImpl.getSession(ServletRequestImpl.java:1397)
  at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:263)
  at org.directwebremoting.impl.DefaultWebContext.getSession(DefaultWebContext.java:94)
  at com.primavera.pvweb.common.DWRSessionTimeoutFilter.doFilter(Unknown Source)
  at org.directwebremoting.impl.DefaultRemoter$1.doFilter(DefaultRemoter.java:428)
  at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:431)
  at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:283)
  at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:52)
  at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
  at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:751)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
  at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
  at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
  at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
  at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346)
  at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.DWRFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.GZIPFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.XSSFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.FrontFilter.doFilter(Unknown Source)
  - locked com.primavera.pvweb.FrontFilter$1UniqueLockedObjectPerRequest@4a3c9b8
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.filters.ApplicationContextInjector.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
  at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
  at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
  at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
  at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
  at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
  at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
  at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
  at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
  at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
  at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)

The issue can be reproduced at will with the following steps:

1. Log into P6.
2. Navigate randomly anywhere in the application until the unresponsive behavior occurs.
3. Note the error defined above in the managed server log files.
4. Note the active thread blocked from the thread dump defined above. To obtain a thread dump:
   
   1. Login to WLS Admin Console.
   2. Under Domain Structure, Expand Environment > Servers.
   3. Select the link for the server hosting P6.
   4. Select Monitoring > Threads tab.
   5. While hogging threads are displayed, select Dump Thread Stacks.

Additional Information:

While the hogging/hung threads occur, attempts to log into P6 will hang and may generate the following error when connecting through IE 11 (which are more a down-stream symptom of the errors occurring above and nothing of direct concern):

weblogic.servlet.internal.ServletNestedRuntimeException: Cannot parse POST parameters of request: '/p6/action/login'
  at weblogic.servlet.internal.ServletRequestImpl$RequestParameters.mergePostParams(ServletRequestImpl.java:2426)
  at weblogic.servlet.internal.ServletRequestImpl$RequestParameters.parseQueryParams(ServletRequestImpl.java:2243)
  at weblogic.servlet.internal.ServletRequestImpl$RequestParameters.getQueryParams(ServletRequestImpl.java:2129)
  at weblogic.servlet.internal.ServletRequestImpl$RequestParameters.getParameterNames(ServletRequestImpl.java:2164)
  at weblogic.servlet.internal.ServletRequestImpl$RequestParameters.access$900(ServletRequestImpl.java:2014)
  at weblogic.servlet.internal.ServletRequestImpl.getParameterNames(ServletRequestImpl.java:891)
  at weblogic.servlet.internal.ServletRequestImpl.getParameterMap(ServletRequestImpl.java:946)
  at javax.servlet.ServletRequestWrapper.getParameterMap(ServletRequestWrapper.java:189)
  at com.primavera.pvweb.XSSFilter.a(Unknown Source)
  at com.primavera.pvweb.XSSFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.FrontFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.filters.ApplicationContextInjector.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at com.primavera.pvweb.DisableURLEncodingFilter.doFilter(Unknown Source)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
  at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
  at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
  at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
  at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
  at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
  at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
  at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
  at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
  at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
  at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
  at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
  at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
Caused By: java.io.IOException: An existing connection was forcibly closed by the remote host
OR
Caused By: java.net.ProtocolException: EOF after reading only: '0' of: '151' promised bytes, out of which at least: '0' were already buffered

Changes

Cause

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