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Arjun Dhar wrote:
<blockquote cite="mid:loom.20070720T185440-223@post.gmane.org"
type="cite">
<blockquote type="cite">
<pre wrap="">QUESTION:: Is the session maintaining references to those objects ever after
executing them? Why are the objects not being released?
Specially I'd imagine for a STATELESS session (which is what I've set as
default).
Using JMeter this system crashes every time under load, even with a single
Thread. Clearly objects are not being released.
The error I get may help you: (Along with out of memory). This exception only
comes under Load conditions.
Admin:ERROR: [com.myserver.brms.demos.certify.web.servlet.CertifyWebRequests]
[service] :org.drools.spi.ConsequenceException: java.lang.NullPointerException
at org.drools.common.DefaultAgenda.fireActivation
(DefaultAgenda.java:501)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:461)
at org.drools.common.AbstractWorkingMemory.fireAllRules
(AbstractWorkingMemory.java:373)
at org.drools.reteoo.ReteooStatelessSession.execute
(ReteooStatelessSession.java:72)
at com.myserver.brms.sessions.RulesEngineSessionJBossRules4.execute
(RulesEngineSessionJBossRules4.java:113)
at
</pre>
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<pre wrap=""><!---->com.myserver.brms.services.execute.recore.batch.ExecuteSessionBatch.executeBatch
</pre>
<blockquote type="cite">
<pre wrap="">(ExecuteSessionBatch.java:160)
Please help me! This is the only downtime issue I face and unfortunatley its
the most critical point of failure.
</pre>
</blockquote>
<pre wrap=""><!---->
Ok, I think I figured it out. But please confirm.
The Rule Engine Session DOES NOT release objects. (But hten why have a
Stateless session?) if the duration of use of the session is not going to be
long?
The solution: Pool the RuleBase and on a request createa freesh session from it
each time a request comes in!
Let me know if the cocept is sound or what I'm thinking is now correct.
Thanks,
Arjun
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</pre>
</blockquote>
Stateless sessions should not hold onto any references. Stateful do,
and dispose() must be called when its finished - otherwise the rulebase
holds a reference forever. If the rulebase is holding onto stateless
sessions, then that is a bug.<br>
<br>
Mark<br>
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