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Generating heap dumps and JVM crashing.

 
Chetan Ram
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Hi All,

We have deployed our application to a server in which JVM is crashing many, many times there are lot of heap dumps getting created in WebSphere6. In fact, our application's JVM is crashing every few minutes, creating 120MB dumps each time. Clearly there is something wrong with the application that needs to be addressed and until the app JVM crash issue is corrected, the WAS filesystem will continue to fill, causing problems with deployments and general WAS sanity.

If heapdumps are getting created and JVM is getting crashed everytime on server. Does this behavior should happen to me locally i.e development box? If locally, not able to produce. How do i handle this issue?


Thanks,
Chinnu
 
Allen Bandela
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Posts: 128
Eclipse IDE MS IE Tomcat Server
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The server may be crashing due to a use-case not being replicated on the local system.

You can generate thread dumps when a crash is imminent. This may help identify the code causing the server crash.

If you are going to generate a thread dump, a nice procedure to analyze is generate multiple dumps between small intervals and determine if any thread is in the same code in all the dumps. This code could then point to the issue.
 
Pierre-Hugues Charbonneau
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Hi Chetan,

Can you please also look at your WAS server log? Heap Dump generation normally indicates your application did trigger an OutOfMemoryError (Java Heap or native memory depletion) condition.

Please provide a snapshot of your server log showing error and StackTrace of the first occurrence of OOM, if any.

Can you please also provide which JDK vendor you are using with WAS6, Sun HotSpot VM or IBM JDK over AIX OS??
 
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