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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: 100% usage and hanging on startup of Spring/Hibernate app in Tomcat 5.5 on Ubuntu 7
Date Thu, 03 Sep 2009 17:49:23 GMT
> From: Bradley Wagner [mailto:bradley.wagner@hannonhill.com]
> Subject: Re: 100% usage and hanging on startup of Spring/Hibernate app
> in Tomcat 5.5 on Ubuntu 7
> 
> Maybe it can't connect when it's hung.

Quite possible; GC stops all threads, so the JMX agent may well be suspended.

You might want to try turning on pretty much all of the GC-related trace flags:

-XX:+PrintGC
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+PrintGCTaskTimeStamps
-XX:+PrintReferenceGC
-XX:+TraceGen0Time
-XX:+TraceGen1Time
-XX:+PrintTenuringDistribution
-XX:+PrintHeapAtGC
-XX:+TraceParallelOldGCTasks
-XX:+PrintParallelOldGCPhaseTimes

(All on one line, of course.)  This will produce a *lot* of output.

 - Chuck


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