[rules-users] Re: BRMS Server - memory Issue while execution - Critical

[Mark Proctor]

Arjun Dhar wrote:
>> 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 
>>
>>     
> com.myserver.brms.services.execute.recore.batch.ExecuteSessionBatch.executeBatch
>   
>> (ExecuteSessionBatch.java:160)
>>
>> Please help me! This is the only downtime issue I face and unfortunatley its 
>> the most critical point of failure.
>>     
>
>
> 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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>
>   
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.

Mark
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