Seeing RejectedExecutionException occasionally when calling the jboss-cli repeatedly in JBoss EAP 6.3 CP3

Issue

• We have a script that calls jboss-cli over and over, the command completes successfully, but occasionally we see this RejectedExecutionException :

Exception in thread "Remoting "cli-client" task-6" java.util.concurrent.RejectedExecutionException: Task org.jboss.remoting3.remote.RemoteConnectionChannel$3@4ac0499d rejected from org.xnio.XnioWorker$TaskPool@162108c2[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 5]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2048)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:821)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1372)
    at org.xnio.XnioWorker.execute(XnioWorker.java:572)
    at org.jboss.remoting3.remote.RemoteConnectionChannel.receiveMessage(RemoteConnectionChannel.java:363)
    at org.jboss.as.protocol.mgmt.ManagementChannelReceiver.handleMessage(ManagementChannelReceiver.java:99)
    at org.jboss.remoting3.remote.RemoteConnectionChannel$5.run(RemoteConnectionChannel.java:451)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

• jboss-cli.sh command sometimes returns a "task rejection" exception after it completes.