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From "Srikanth R (JIRA)" <j...@apache.org>
Subject [jira] Created: (OJB-44) ReferenceMap$Entry keeps growing over period of application usage.
Date Mon, 23 May 2005 13:35:53 GMT
ReferenceMap$Entry keeps growing over period of application usage.
------------------------------------------------------------------

         Key: OJB-44
         URL: http://issues.apache.org/jira/browse/OJB-44
     Project: OJB
        Type: Bug
  Components: PB-API  
    Versions: 1.0.3    
 Environment: Windows 2000 Professional, Jboss (3.2.5)
    Reporter: Srikanth R


We are using OJB in one of our application which is very much database intensive. When we
put the application under load testing, the memory kept on growing and at one stage, the application
became very slow as there was hardly any memory left on the machine. We were forced to re-start
the app server.

On putting the application under a profiler, we observed that, the "ReferenceMap$Entry" kept
on growing in size. Also we saw some of our application specific objects in memory as it was
not released to the garbage collector. We changed the "AnonymousPersistentField.java",  to
wrap the value as a weak reference. The code snippet is given below:

protected void putToFieldCache(Object key, Object value)
{
  ...
  fkCache.put(key, new WeakReference(value));
  ...
}
Similarly the "getFromFieldCache" is changed to un-wrap the value.
Ideally the memory should come down to the original value after each transaction.

After doing these changes, we found NO references to our application specific objects in the
memory but still "ReferenceMap$Entry" kept growing in size.

Let me know if the fix is a correct one and how to clear of "ReferenceMap$Entry". 

We are using "org.apache.ojb.broker.cache.ObjectCachePerBrokerImpl" as the caching implemetation
and the broker is closed at the end of the transaction.

Thanks,
Sriki


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