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<http://param.name>() cannot be called regards Nicolas 2010/2/10 Glenn Macgregor <gmacgregor@pocketkings.ie<mailto:gmacgregor@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<http://param.name>()); End Exception & Debug: OBJECT ASSERTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@1265109 factId: 2 OBJECT RETRACTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@1265109 factId: 2 OBJECT ASSERTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@5e8d7d factId: 3 OBJECT RETRACTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@5e8d7d factId: 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); $param=ie.PocketKings.SystemsManagement.Alerting.Parameter@2431b9(4) OBJECT RETRACTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@19b4748 factId: 4 OBJECT ASSERTED value:ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent@19b4748 factId: -1 org.drools.runtime.rule.ConsequenceException: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885) at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1065) at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:701) at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:678) at org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:195) at ie.PocketKings.SystemsManagement.Alerting.SessionRunner.run(SessionRunner.java:13) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException at org.drools.base.ie.PocketKings.SystemsManagement.Alerting.ParameterUpdateEvent6011238$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@19fdbcb factId: 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<mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users