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From Timofey <>
Subject Memory leak in EJB or somewhere
Date Tue, 31 Jul 2007 11:02:17 GMT

I'm running Geronimo 1.1.1 (branch Rev431518) under JDK 1.4.2. There's
relatively simple EJB-based application that accesses Derby through tranql
connector 1.2. Having several clients connected and sending a simple request
once per 10 seconds, I'm seeing java.lang.OutOfMemoryError with no stack
trace. It looks exactly like if the application is redeployed, but it is
not, and MaxPermSize is increased properly.

I've tried to profile the application and found that the objects of the
following classes are accumulated:


And many others, related to transactions and tranql. Also, objects of
generated classes like$$EnhancerByCGLIB$$65ba9f43 are
accumulated. Finally, <class>[] objects are accumulated, causing permanent
generation to overflow and display that OutOfMemoryError.

It doesn't look like a programming error, because:

1. The objects are released if one more client is connected (it doesn't
always work, though).
2. The memory is not leaked at all if the number if clients is relatively
large (50, for example).

The memory is not released when application is redeployed. For me, it looks
like TranQL is caching transaction data but never releases them. Of course,
I can switch to use Bean transactions instead of Container transactions, but
it doesn't seem to be a good solution.

Can anyone help me? I'm working 3 weeks to fix the issue and completely ran
out of ideas.

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