[jboss-jira] [JBoss JIRA] Created: (JBRULES-763) predicate with multiple variable references causes NPE

[Steve Miner (JIRA)]

predicate with multiple variable references causes NPE
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                 Key: JBRULES-763
                 URL: http://jira.jboss.com/jira/browse/JBRULES-763
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 3.0.6
         Environment: Mac OS X 10.4.9  JBoss Rules 3.0.6
            Reporter: Steve Miner
         Assigned To: Mark Proctor


I'm trying to use a predicate that has multiple references to bound variables all within the same fact.  If I use only one variable, it works, but it causes a NPE if I have two references.

// This rule causes a NPE
rule "more friends than enemies"
when
	$p : Person($enemies : enemies, $friends : friends -> ($friends.size() > $enemies.size()))
then
	System.out.println($p + " has more friends than enemies");
end


stack trace
org.drools.RuntimeDroolsException: java.lang.NullPointerException
	at org.drools.rule.PredicateConstraint.isAllowed(Unknown Source)
	at org.drools.common.BetaNodeBinder.isAllowed(Unknown Source)
	at org.drools.reteoo.LeftInputAdapterNode.assertObject(Unknown Source)
	at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)
	at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
	at org.drools.reteoo.Rete.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at com.sample.DroolsTest.main(DroolsTest.java:51)
Caused by: java.lang.NullPointerException
	at com.sample.Rule_more_friends_than_enemies_0Predicate0Invoker.evaluate(Rule_more_friends_than_enemies_0Predicate0Invoker.java:13)
	... 11 more



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