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From "anish pathadan (JIRA)" <>
Subject [jira] Commented: (AMQ-1214) threads not stopping causing memory leaks which can lead to OutOfMemoryError
Date Mon, 30 Apr 2007 15:35:34 GMT


anish pathadan commented on AMQ-1214:

Hi All,
      This bug can be closed as the threads persisted are valid.

If we run the original test case(ie threadleaker.tar.gz), we can see the threads which persisted
are two "ActiveMQ Scheduler" threads. These threads are executed using ScheduledThreadPoolExecutor
with a pool size of 5. Pool size of 5 means a maximum of 5 such threads will be available
in the pool and these threads will be used to execute n number of "ActiveMQ Scheduler" threads.

If connection is created and closed a lot of times, a maximum of 5 "ActiveMQ Scheduler" threads
and  lots of "ActiveMQ Connection worker"  threads will be created.The latter  thread is created
to be timed out after 5 seconds of creation.

This can be verified by executing the attached . This testcase prints the total
number of threads in the system after a  connection.start() and connection.close() is called.The
total  number of threads never increases to a very high number  as the initial threads are
getting timed out. 


> threads not stopping causing memory leaks which can lead to OutOfMemoryError
> ----------------------------------------------------------------------------
>                 Key: AMQ-1214
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 4.1.0
>         Environment: Fedora Core 6
>            Reporter: Xavier Toth
>         Attachments:, threadleak.tar.gz
> Threads started by ActiveMQ on behalf of a client persist in a ThreadGroup despite calling
the 'interrupt' method on the group thereby leaking memory.  

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