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Author Message
thanneru
 Post subject: Illegal attempt to associate a collection with two open sess
PostPosted: Tue Nov 16, 2004 4:26 pm 
Newbie

Joined: Mon Feb 09, 2004 6:07 pm
Posts: 7
We are using Hinernate for the last one year in development, and had very good luck with it. Now, the time has come for production deployment and we did some performance testing to make sure that the app can sustain load. We are using Jmeter and when the load increases (more than 25 users), we are getting a lot of Illegal attempt to associate a collection with two open sessions exceptions.

I understand that the exception message is pretty self explanatory. BUT, it does not tell me which collection it is that I am allegedly associating with more than one session? I am using the session per request pattern with a ThreadLocal. I just want to know how I can fix this problem. It does not happen in my unit tests or in our development/QA environments. It is only happening on high load (not too high, but when more than 25 users are logged in). The exception message or the stack trace does not tell me anything about which collection is being associated with more than one session.

Please let me know if you need any additional information.

Here is a sample stack trace:
Code:
avax.servlet.ServletException: Hibernate error
   at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
   at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
   at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
   at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
   at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.securityfilter.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at com.comcast.commsales.hibernate.HibernateConfig.doFilter(HibernateConfig.java:353)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at com.comcast.commsales.security.PrincipalFilter.doFilter(PrincipalFilter.java:59)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
   at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
   at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
   at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
   at java.lang.Thread.run(Thread.java:534)

Root cause:
com.comcast.commsales.bl.BLException: Hibernate error
   at com.comcast.commsales.bl.LeadServices.promoteLead(LeadServices.java:704)
   at com.comcast.commsales.ui.lead.details.PromoteAction.update(PromoteAction.java:117)
   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:324)
   at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
   at com.comcast.commsales.ui.struts.ButtonDispatchAction.dispatchMethod(ButtonDispatchAction.java:48)
   at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)
   at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
   at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
   at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
   at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.securityfilter.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at com.comcast.commsales.hibernate.HibernateConfig.doFilter(HibernateConfig.java:353)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at com.comcast.commsales.security.PrincipalFilter.doFilter(PrincipalFilter.java:59)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
   at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
   at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
   at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
   at java.lang.Thread.run(Thread.java:534)
Caused by: net.sf.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
   at net.sf.hibernate.collection.PersistentCollection.setCurrentSession(PersistentCollection.java:262)
   at net.sf.hibernate.impl.WrapVisitor.processCollection(WrapVisitor.java:41)
   at net.sf.hibernate.impl.AbstractVisitor.processValue(AbstractVisitor.java:69)
   at net.sf.hibernate.impl.WrapVisitor.processValues(WrapVisitor.java:86)
   at net.sf.hibernate.impl.SessionImpl.flushEntity(SessionImpl.java:2456)
   at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2422)
   at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2224)
   at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2203)
   at com.comcast.commsales.bl.LeadServices.promoteLead(LeadServices.java:699)
   ... 47 more
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