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From Kevan Miller <>
Subject Re: Web server stopped responding to requests until restart
Date Thu, 26 Feb 2009 15:13:39 GMT

On Feb 26, 2009, at 5:58 AM, Stella Lok wrote:

> Hi,
> I am using WAS CE with ActiveMQ 5.2.0. While doing load
> testing, I encountered situations when the web server (which is the
> Tomcat embedded in WAS CE) permanently (until restart) stopped
> responding to any HTTP requests (the catalina log stops logging new
> requests), and none of the apps nor the admin console can be accessed
> anymore. When that happens, the WAS CE java process' CPU utilization
> would invariably be permanently stuck at around the 50% level, even if
> I completely stop accessing the server.
> I did a thread dump whenever this occurred, and most of the time I do
> not see any blocked threads, only runnable, parked and
> waiting-on-condition threads. Once, I was able to see that there were
> 4 blocked ActiveMQ threads, though I'm not sure if this is related.
> I would be most grateful if someone could help guide me to possible
> causes of the problem.

Hmm. Do you still have the thread dumps? Esp. the one showing the  
blocked AMQ threads? Is this a 2 CPU machine (e.g. a single dual core  
processor?) Sounds like you have a single thread spinning. A thread  
dump should help identify the culprit... Are you running on Sun or IBM  


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