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From Stella Lok <>
Subject Web server stopped responding to requests until restart
Date Thu, 26 Feb 2009 10:58:01 GMT

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.

Thank you

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