Support Article
ConcurrentModificationException while running Resource Adapter
SA-45343
Summary
ConcurrentModificationException occurs while running the PRESENCECLEANER_DAEMON Resource Adapter function. The server, later, is unresponsive and displays the error, 'Unable to get managed connection for java:/eis/PRAdapterConnectionFactory'.
Error Messages
SEVERE [com.pega.pegarules.internal.bootstrap.PRBootstrap] (Thread-217 () Problem during method invocation (invokeEngine): com.pega.pegarules.pub.PRRuntimeException: PRRuntimeException
at com.pega.pegarules.session.internal.presence.PresenceSessionStateTrackerDaemon.requeueETierInvocation(PresenceSessionStateTrackerDaemon.java:178)
at com.pega.pegarules.session.internal.presence.PresenceSessionStateTrackerDaemon.run(PresenceSessionStateTrackerDaemon.java:135)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.processAsyncTask(AsyncServant.java:319)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.invoke(AsyncServant.java:169)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274)
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source) [:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_131]
at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_131]
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370) [prbootstrap.jar:7.3.0-77]
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411) [prbootstrap.jar:7.3.0-77]
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224) [prbootstrap-api.jar:7.3.0-77]
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:246) [prbootstrap-api.jar:7.3.0-77]
at com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.invokeEngine(EngineBeanBoot.java:168) [prbootstrap-api.jar:7.3.0-77]
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source) [:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_131]
Steps to Reproduce
Deploy prpc_j2ee14_jboss61JBM.ear (according to the Deployment Guide on a JBoss 6.4 application server) and wait till the PRESENCECLEANER_DAEMON is executed.
Root Cause
A defect in Pegasystems’ code or rules.
The logs contain ConcurrentModificationException and occurs when a task is executed by sending a map of parameters as an argument in the presence of the Daemon. While executing the task, the map of parameters is modified which results in the exception. Due to this, the connections are not released which leads to the connections getting exhausted.
Resolution
Apply HFix-38230.
Published December 17, 2017 - Updated October 8, 2020
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