[jboss-jira] [JBoss JIRA] (JBRULES-3383) Order of fact retractions causes NPE

[Wolfgang Laun (JIRA)]

Wolfgang Laun created JBRULES-3383:
--------------------------------------

             Summary: Order of fact retractions causes NPE
                 Key: JBRULES-3383
                 URL: https://issues.jboss.org/browse/JBRULES-3383
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core, drools-core  (expert)
    Affects Versions: 5.3.0.Final
            Reporter: Wolfgang Laun
            Assignee: Mark Proctor
            Priority: Critical


Insert one from each, the second referencing the first:
class Event{ String name; }
class Monitor{ Event event; String name; }

The following rule runs into a NPE, except when reversing the marked lines.
rule "timeout"
timer( int: 10s )
when
    $m: Monitor( name == $name )
    $e: Event($name: name)
then
    retract( $m );            // =======================
    retract( $m.getEvent() );  // ========================
end

Exception in thread "main" Exception executing consequence for rule "start monitoring" in hashcode: java.lang.NullPointerException
	at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
	at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1229)
	at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:753)
	at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:729)
	at org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:234)
	at hashcode.Main.execute(Main.java:148)
	at hashcode.Main.main(Main.java:206)
Caused by: java.lang.NullPointerException
	at org.drools.base.hashcode.StateEvent42211789$getItemName.getValue(Unknown Source)
	at org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:87)
	at org.drools.rule.Declaration.getValue(Declaration.java:219)
	at hashcode.Rule_start_monitoringDefaultConsequenceInvoker.evaluate(Unknown Source)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
	... 7 more



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