Hi again, if you want to show the attribute name just do $param.name, there is no need for () If it is a method, put a dummy parameter Regards Nicolas
2010/2/10 Glenn Macgregor <gmacgre...@pocketkings.ie> > Hi Nicolas, > > Thanks for the response. The strange thing is I do not get this error when > I run inside the debugger with the same facts. This made me believe it is a > timing issue. I am using the latest stable drools - 5.0.1 > > Thanks > > Glenn > > ------------------------------ > *From*: rules-users-boun...@lists.jboss.org > *To*: Rules Users List > *Sent*: Wed Feb 10 18:18:57 2010 > *Subject*: Re: [rules-users] CEP Error > > Hi, > It says that the $param is null so $param.name() cannot be called > regards > Nicolas > > 2010/2/10 Glenn Macgregor <gmacgre...@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.parameterupdateev...@1265109factid: >> 2 >> >> OBJECT RETRACTED >> value:ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@1265109factid: >> 2 >> >> OBJECT ASSERTED >> value:ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@5e8d7dfactid: >> 3 >> >> OBJECT RETRACTED >> value:ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@5e8d7dfactid: >> 3 >> >> ACTIVATION CREATED rule:Param Update Event Rule activationId:Param Update >> Event Rule [4, 0] declarations: >> $pue=ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@19b4748(4); >> $param=ie.pocketkings.systemsmanagement.alerting.parame...@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.parameterupdateev...@19b4748(4); >> $param=ie.pocketkings.systemsmanagement.alerting.parame...@2431b9(4) >> >> OBJECT RETRACTED >> value:ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@19b4748factid: >> 4 >> >> OBJECT ASSERTED >> value:ie.pocketkings.systemsmanagement.alerting.parameterupdateev...@19b4748factid: >> -1 >> >> *org.drools.runtime.rule.ConsequenceException*: * >> java.lang.NullPointerException* >> >> at >> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException( >> *DefaultConsequenceExceptionHandler.java:23*) >> >> at org.drools.common.DefaultAgenda.fireActivation(* >> DefaultAgenda.java:943*) >> >> at org.drools.common.DefaultAgenda.fireNextItem(* >> DefaultAgenda.java:885*) >> >> at org.drools.common.DefaultAgenda.fireUntilHalt(* >> DefaultAgenda.java:1065*) >> >> at org.drools.common.AbstractWorkingMemory.fireUntilHalt(* >> AbstractWorkingMemory.java:701*) >> >> at org.drools.common.AbstractWorkingMemory.fireUntilHalt(* >> AbstractWorkingMemory.java:678*) >> >> at org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(* >> StatefulKnowledgeSessionImpl.java:195*) >> >> at ie.PocketKings.SystemsManagement.Alerting.SessionRunner.run(* >> SessionRunner.java:13*) >> >> at java.lang.Thread.run(Unknown Source) >> >> Caused by: *java.lang.NullPointerException* >> >> at >> org.drools.base.ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent6011238$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.parameterupdateev...@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@lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > >
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