[rules-users] CEP Error

[Nicolas Héron]

Hi,
It says that the $param is null so $param.name() cannot be called
regards
Nicolas

2010/2/10 Glenn Macgregor <gmacgregor at pocketkings.ie>

>  Hi All,
>
>
>
> I have a simple CEP test case which I am working through. I am currently
> getting a NullPointerException in the Consequence and have no idea why.
>
>
>
> *Rule:
> **rule* "Param Update Event Rule"
>
>       *when*
>
>             $pue : ParameterUpdateEvent(name == "testParam2", $param :
> param) *from* entry-point "ParamUpdateStream"
>
>       *then*
>
>             #System.out.println("Param '" + $pue.getName() + "' has been
> updated to " + $pue.getValue());
>
>             System.out.println("HERE!!! " + $param + " " + $param.name());
>
> *End*
>
> * *
>
> *Exception & Debug:*
>
> OBJECT ASSERTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 1265109factId: 2
>
> OBJECT RETRACTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 1265109factId: 2
>
> OBJECT ASSERTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 5e8d7dfactId: 3
>
> OBJECT RETRACTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 5e8d7dfactId: 3
>
> ACTIVATION CREATED rule:Param Update Event Rule activationId:Param Update
> Event Rule [4, 0] declarations:
> $pue=ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 19b4748(4);
> $param=ie.PocketKings.SystemsManagement.Alerting.Parameter at 2431b9(4)
>
> Exception in thread "Thread-3" BEFORE ACTIVATION FIRED rule:Param Update
> Event Rule activationId:Param Update Event Rule [4, 0] declarations:
> $pue=ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 19b4748(4);
> $param=ie.PocketKings.SystemsManagement.Alerting.Parameter at 2431b9(4)
>
> OBJECT RETRACTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 19b4748factId: 4
>
> OBJECT ASSERTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 19b4748factId: -1
>
> *org.drools.runtime.rule.ConsequenceException*: *
> java.lang.NullPointerException*
>
>       at
> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(
> *DefaultConsequenceExceptionHandler.java:23*)
>
>       at org.drools.common.DefaultAgenda.fireActivation(*
> DefaultAgenda.java:943*)
>
>       at org.drools.common.DefaultAgenda.fireNextItem(*
> DefaultAgenda.java:885*)
>
>       at org.drools.common.DefaultAgenda.fireUntilHalt(*
> DefaultAgenda.java:1065*)
>
>       at org.drools.common.AbstractWorkingMemory.fireUntilHalt(*
> AbstractWorkingMemory.java:701*)
>
>       at org.drools.common.AbstractWorkingMemory.fireUntilHalt(*
> AbstractWorkingMemory.java:678*)
>
>       at org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(*
> StatefulKnowledgeSessionImpl.java:195*)
>
>       at ie.PocketKings.SystemsManagement.Alerting.SessionRunner.run(*
> SessionRunner.java:13*)
>
>       at java.lang.Thread.run(Unknown Source)
>
> Caused by: *java.lang.NullPointerException*
>
>       at
> org.drools.base.ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent6011238$getParam.getValue(Unknown
> Source)
>
>       at org.drools.base.ClassFieldReader.getValue(*
> ClassFieldReader.java:91*)
>
>       at org.drools.rule.Declaration.getValue(*Declaration.java:244*)
>
>       at
> ie.PocketKings.SystemsManagement.Alerting.Rule_Param_Update_Event_Rule_0ConsequenceInvoker.evaluate(
> *Rule_Param_Update_Event_Rule_0ConsequenceInvoker.java:16*)
>
>       at org.drools.common.DefaultAgenda.fireActivation(*
> DefaultAgenda.java:934*)
>
>       ... 7 more
>
> OBJECT ASSERTED
> value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent at 19fdbcbfactId: 5
>
>
>
>
>
> Could it be that my Event object is getting destroyed before the
> consequence is run, is that what “OBJECT RETRACKED” means in this case?
>
>
>
> Thanks
>
>
>
>  Glenn
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20100210/8ee6b0a0/attachment.html