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From "David Jencks (JIRA)" <...@geronimo.apache.org>
Subject [jira] Commented: (GERONIMO-2081) Concurrency problems in Daytrader or AMQ
Date Sun, 04 Jun 2006 03:42:30 GMT
    [ http://issues.apache.org/jira/browse/GERONIMO-2081?page=comments#action_12414617 ] 

David Jencks commented on GERONIMO-2081:
----------------------------------------

Connection sharing removed from daytrader in rev 411511.


> Concurrency problems in Daytrader or AMQ
> ----------------------------------------
>
>          Key: GERONIMO-2081
>          URL: http://issues.apache.org/jira/browse/GERONIMO-2081
>      Project: Geronimo
>         Type: Bug
>     Security: public(Regular issues) 
>   Components: sample apps
>     Versions: 1.1
>     Reporter: David Jencks
>     Assignee: David Jencks
>      Fix For: 1.1

>
> Brian Noll found a bunch of ConcurrentModificationException problems when running daytrader
PingServlet2MDBQueue under mutltithread load.  These are due either to PingServlet2MDBQueue
sharing a connection between all 50+ threads or activemq not allowing such connection sharing.
 I'm going to remove the connection sharing in daytrader and ask Hiram to figure out if AMQ
needs more synchronization.
> Here's the stack trace Brian got, showing at least 2 concurrency problems:
> 18:35:41,171 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...):exception posting message
to TradeBrokerQueue destination
> 18:35:41,172 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...): error
>  
>         java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.NullPointerException
>         at jsp.error_jsp._jspService(error_jsp.java:65)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
>         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
>         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
>         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
>         at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363)
>         at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> 18:35:52,477 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...):exception posting message
to TradeBrokerQueue destination
> 18:35:52,478 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...): error
>  
>         java.lang.ArrayIndexOutOfBoundsException
> java.lang.ArrayIndexOutOfBoundsException
>         at java.lang.System.arraycopy(Native Method)
>         at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
>         at java.util.ArrayList.add(ArrayList.java:354)
>         at org.activemq.ra.JMSConnectionProxy.createSessionProxy(JMSConnectionProxy.java:121)
>         at org.activemq.ra.JMSConnectionProxy.createSession(JMSConnectionProxy.java:106)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:117)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.ArrayIndexOutOfBoundsException
>         at java.lang.System.arraycopy(Native Method)
>         at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
>         at java.util.ArrayList.add(ArrayList.java:354)
>         at org.activemq.ra.JMSConnectionProxy.createSessionProxy(JMSConnectionProxy.java:121)
>         at org.activemq.ra.JMSConnectionProxy.createSession(JMSConnectionProxy.java:106)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:117)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.NullPointerException
>         at jsp.error_jsp._jspService(error_jsp.java:65)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
>         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
>         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
>         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
>         at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363)
>         at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> 18:35:58,779 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...):exception posting message
to TradeBrokerQueue destination
> 18:35:58,779 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...): error
>  
>         java.lang.ArrayIndexOutOfBoundsException
> java.lang.ArrayIndexOutOfBoundsException
>         at java.lang.System.arraycopy(Native Method)
>         at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
>         at java.util.ArrayList.add(ArrayList.java:354)
>         at org.activemq.ra.JMSConnectionProxy.createSessionProxy(JMSConnectionProxy.java:121)
>         at org.activemq.ra.JMSConnectionProxy.createSession(JMSConnectionProxy.java:106)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:117)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.ArrayIndexOutOfBoundsException
>         at java.lang.System.arraycopy(Native Method)
>         at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
>         at java.util.ArrayList.add(ArrayList.java:354)
>         at org.activemq.ra.JMSConnectionProxy.createSessionProxy(JMSConnectionProxy.java:121)
>         at org.activemq.ra.JMSConnectionProxy.createSession(JMSConnectionProxy.java:106)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:117)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.NullPointerException
>         at jsp.error_jsp._jspService(error_jsp.java:65)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
>         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
>         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
>         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
>         at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363)
>         at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> 18:36:07,019 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...):exception posting message
to TradeBrokerQueue destination
> 18:36:07,020 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...): error
>  
>         java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.NullPointerException
>         at jsp.error_jsp._jspService(error_jsp.java:65)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
>         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
>         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
>         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
>         at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363)
>         at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> 18:36:09,680 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...):exception posting message
to TradeBrokerQueue destination
> 18:36:09,680 ERROR [Log] Error: PingServlet2MDBQueue.doGet(...): error
>  
>         java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)
>         at java.util.AbstractList$Itr.next(AbstractList.java:419)
>         at java.util.AbstractCollection.remove(AbstractCollection.java:254)
>         at org.activemq.TransactionContext.removeSession(TransactionContext.java:116)
>         at org.activemq.ra.RATransactionContext.removeSession(RATransactionContext.java:57)
>         at org.activemq.ActiveMQSession.doClose(ActiveMQSession.java:466)
>         at org.activemq.ActiveMQSession.close(ActiveMQSession.java:447)
>         at org.activemq.ra.JMSSessionProxy.cleanup(JMSSessionProxy.java:87)
>         at org.activemq.ra.JMSSessionProxy.close(JMSSessionProxy.java:76)
>         at org.apache.geronimo.samples.daytrader.web.prims.PingServlet2MDBQueue.doGet(PingServlet2MDBQueue.java:127)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
>         at org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
>         at org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:342)
>         at org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:31)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)
> java.lang.NullPointerException
>         at jsp.error_jsp._jspService(error_jsp.java:65)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
>         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
>         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
>         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
>         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
>         at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363)
>         at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
>         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
>         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
>         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
>         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
>         at java.lang.Thread.run(Thread.java:534)

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