Saw the following exception in the server log, but not sure what I did to trigger it (unable to reproduce):

07:31:32,834 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 1) JBAS014612: Operation ("list-sessions") failed - address: ([("subsystem" => "teiid")]): java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819) [rt.jar:1.7.0_13]
at java.util.ArrayList$Itr.next(ArrayList.java:791) [rt.jar:1.7.0_13]
at org.teiid.jboss.ListSessions.executeOperation(TeiidOperationHandler.java:245)
at org.teiid.jboss.ListSessions.executeOperation(TeiidOperationHandler.java:225)
at org.teiid.jboss.BaseOperationHandler$1.execute(BaseOperationHandler.java:72)
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:440) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:322) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:229) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:224) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:142) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:112) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:139) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:108) [jboss-as-controller-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.protocol.mgmt.AbstractMessageHandler$2$1.doExecute(AbstractMessageHandler.java:296) [jboss-as-protocol-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at org.jboss.as.protocol.mgmt.AbstractMessageHandler$AsyncTaskRunner.run(AbstractMessageHandler.java:518) [jboss-as-protocol-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_13]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_13]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_13]
at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.0.Final.jar:2.1.0.Final]