Re: [rules-users] CEP Error

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-bounces(a)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 <gmacgregor(a)pocketkings.ie&gt; > 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@1265109factId: 2 > > OBJECT RETRACTED > value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@1265109factId: 2 > > OBJECT ASSERTED > value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@5e8d7dfactId: 3 > > OBJECT RETRACTED > value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@5e8d7dfactId: 3 > > ACTIVATION CREATED rule:Param Update Event Rule activationId:Param Update > Event Rule [4, 0] declarations: > $pue=ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@19b4748(4); > $param=ie.PocketKings.SystemsManagement.Alerting.Parameter@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@19b4748(4); > $param=ie.PocketKings.SystemsManagement.Alerting.Parameter@2431b9(4) > > OBJECT RETRACTED > value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@19b4748factId: 4 > > OBJECT ASSERTED > value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@19b4748factId: -1 > > *org.drools.runtime.rule.ConsequenceException*: * > java.lang.NullPointerException* > > at > org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException( > *DefaultConsequenceExceptionHandler.java:23*) > > at org.drools.common.DefaultAgenda.fireActivation(* > DefaultAgenda.java:943*) > > at org.drools.common.DefaultAgenda.fireNextItem(* > DefaultAgenda.java:885*) > > at org.drools.common.DefaultAgenda.fireUntilHalt(* > DefaultAgenda.java:1065*) > > at org.drools.common.AbstractWorkingMemory.fireUntilHalt(* > AbstractWorkingMemory.java:701*) > > at org.drools.common.AbstractWorkingMemory.fireUntilHalt(* > AbstractWorkingMemory.java:678*) > > at org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(* > StatefulKnowledgeSessionImpl.java:195*) > > at ie.PocketKings.SystemsManagement.Alerting.SessionRunner.run(* > SessionRunner.java:13*) > > at java.lang.Thread.run(Unknown Source) > > Caused by: *java.lang.NullPointerException* > > at > org.drools.base.ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent6011238$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@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(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users