ReferenceMap$Entry keeps growing over period of application usage.
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Key: OJB-44
URL: http://issues.apache.org/jira/browse/OJB-44
Project: OJB
Type: Bug
Components: PB-API
Versions: 1.0.3
Environment: Windows 2000 Professional, Jboss (3.2.5)
Reporter: Srikanth R
We are using OJB in one of our application which is very much database
intensive. When we put the application under load testing, the memory kept on
growing and at one stage, the application became very slow as there was hardly
any memory left on the machine. We were forced to re-start the app server.
On putting the application under a profiler, we observed that, the
"ReferenceMap$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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