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

[Mark Proctor (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-763?page=all ]

Mark Proctor closed JBRULES-763.
--------------------------------

    Resolution: Out of Date

Using bindings from the same pattern is a known problem for 3.0.x and won't be fixed in that branch, it is already fixed in trunk.
http://jira.jboss.com/jira/browse/JBRULES-515

> predicate with multiple variable references causes NPE
> ------------------------------------------------------
>
>                 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
>         Attachments: drools-predicate-bug.zip
>
>
> 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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