Weblogic, Java and the Garbage Collector. . . Memory Leak?

lhunt16
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We are using weblogic server(6.1) and jdk 1.3.1 for our web application. Java Garbage Collector is not cleaning unused memory even the memory usage is more than 90%. We need to do "force to garbage collection" for every day. The memory usage goes down most of the time once a "force to garbage collection" is done. We believe it to be a memory leak, but can not find the error in the code.  I saw that someone else had posted a similiar question, so I know that we are not alone with this issue.  Any suggestions in where to look or how to stop the issue would be greatly appreciated!

Note : outofmemoryexception error is received in the application if we don't do the "force to garbage collection".

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We use Jboss v3.2.2 and jdk1.4.1_02 for our application.  The OutOfMemoryException was a familiar problem we had and may be related to yours.  For our situation, we found that memory leaks were coming from not properly closing Connection objects, PreparedStatements, and ResultSets.  
Commented:
We had a similar problem with the 6.1 release in the past. BEA support recommended to increase the heap size in the JVM - you'll need to modify the batch/script files to accomplish that. This solved the outofmemory exception problem for us. If it was a memory leak, it would only have increased the intervals between the execeptions, but for us they've completely gone away.

The high memory usage of 90% is not necessarily a result of a memory leak, since weblogic likes to cache a lot for future use.

Regards,

 - michael
Mick BarryJava Developer
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