[jboss-jira] [JBoss JIRA] Resolved: (JBRULES-2326) request to improve upon error message received from invalid rule syntax (currently getting NPE)

request to improve upon error message received from invalid rule syntax (currently getting NPE) ----------------------------------------------------------------------------------------------- Key: JBRULES-2326 URL: https://jira.jboss.org/browse/JBRULES-2326 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.1.0.M1 Reporter: Jeremy Ary Assignee: Edson Tirelli Fix For: 5.2.0.M1 My (albeit improper) rule syntax that caused the NPE error: when QueueList ( queueIds contains 1 ) ( not EventList ( events contains 1 ) || ( $eventList : EventList ( events contains 1 ) && RfEvent ( eventTypeId == 1, lastActivationLong after[-1h] sessionTime ) from $eventList.events ) ) then modify (eventList) { add(1) } Stack Trace: org.drools.runtime.rule.ConsequenceException: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:627) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:183) at com.famc.service.RuleFlowRunner.main(RuleFlowRunner.java:118) Caused by: java.lang.NullPointerException at org.drools.base.mvel.DroolsMVELFactory.getTupleObjectFor(DroolsMVELFactory.java:182) at org.drools.base.mvel.DroolsMVELFactory.setContext(DroolsMVELFactory.java:176) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:57) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934) ... 6 more Request for ticket: [10:19] <etirelli> jary: raising a NPE is clearly a bug, but the reason is that you have modify(eventList) instead of modify($eventList)... in any case, the way you authored the rule is not ideal [10:19] <etirelli> jary: could you please open a JIRA so that we can provide an appropriate error message, please?