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Date: Fri, 2 Nov 2012 19:41:12 +0000 (UTC)
From: "Timothy Bish (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
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Subject: [jira] [Resolved] (AMQ-4156) Inactivity monitor rejected from
 thread pool
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     [ https://issues.apache.org/jira/browse/AMQ-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timothy Bish resolved AMQ-4156.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 5.8.0
         Assignee: Timothy Bish

Added some additional checks in the AbstractInactivityMonitor to prevent it from throwing an error if the timer task fails to queue into the executor because its shutdown. 
                
> Inactivity monitor rejected from thread pool
> --------------------------------------------
>
>                 Key: AMQ-4156
>                 URL: https://issues.apache.org/jira/browse/AMQ-4156
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.5.1
>         Environment: VM name: Java HotSpot(TM) 64-Bit Server VM
> VM Version: 23.1-b03
> VM Vendor: Oracle Corporation
>            Reporter: vilius
>            Assignee: Timothy Bish
>              Labels: concurrency
>             Fix For: 5.8.0
>
>
> 2012/09/04 17:50:10.746 [UncaughtExceptionHandler] [InactivityMonitor WriteCheck]:   ERROR:  FATAL ERROR Uncaught Exception occurred in thread Thread[InactivityMonitor WriteCheck,5,main]  
> [Exception: java.util.concurrent.RejectedExecutionException: Task org.apache.activemq.transport.InactivityMonitor$3@321e23e9 rejected from java.util.concurrent.ThreadPoolExecutor@58c7afb3[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 441]
> 	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2013)
> 	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:816)
> 	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1337)
> 	at org.apache.activemq.transport.InactivityMonitor.writeCheck(InactivityMonitor.java:147)
> 	at org.apache.activemq.transport.InactivityMonitor$2.run(InactivityMonitor.java:113)
> 	at org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
> 	at java.util.TimerThread.mainLoop(Timer.java:555)
> 	at java.util.TimerThread.run(Timer.java:505)
> ] 
> N.B. The system was not shutting down as far as I can see. No idea what happened with our system, we only saw this once in our logs.
> Could there be a race condition when a Write check throws an exception? Since the timer is scheduled at fixed rate, if the system was to halt for a while it may try to execute the task a fair few times? You may get the sense I have little clue what I'm talking about :-)

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