[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1415) Certain uses of from causes NullPointerException in WorkingMemoryLogger

[Mattias Nilsson (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-1415?page=comments#action_12394831 ] 
            
Mattias Nilsson commented on JBRULES-1415:
------------------------------------------

I checked out the source code and found that the problem seems to be solved if I make the following change in method extractDeclarations in class WorkingMemoryLogger.

From:
  final Object value = declaration.getValue( (InternalWorkingMemory) workingMemory, workingMemory.getObject( handle ) );

To:
  final Object value = declaration.getValue( (InternalWorkingMemory) workingMemory, handleImpl.getObject());

But maybe it isn't safe to call handleImpl.getObject instead of workingMemory.getObject?

Regards,
Mattias

> Certain uses of from causes NullPointerException in WorkingMemoryLogger
> -----------------------------------------------------------------------
>
>                 Key: JBRULES-1415
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1415
>             Project: JBoss Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 4.0.3
>            Reporter: Mattias Nilsson
>         Attachments: testcase.zip
>
>
> This rule causes a NullPointerException when WorkingMemoryFileLogger is activated. Without the logger the rule works fine.
> {quote}
> rule "TestRule"
> 	when
> 		A( theList : list )
> 		B( theName : name ) from theList
> 	then
> 		System.out.println( "ok" ); 
> end
> {quote}
> Seems to be the assigning of variable theName that causes the problem. If i remove "theName : name" there is no NullPointerException. Here is the stack trace:
> java.lang.NullPointerException
> 	at org.drools.base.com.sample.DroolsTest$B15799300$getName.getValue(Unknown Source)
> 	at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:127)
> 	at org.drools.rule.Declaration.getValue(Declaration.java:197)
> 	at org.drools.audit.WorkingMemoryLogger.extractDeclarations(WorkingMemoryLogger.java:267)
> 	at org.drools.audit.WorkingMemoryLogger.activationCreated(WorkingMemoryLogger.java:201)
> 	at org.drools.event.AgendaEventSupport.fireActivationCreated(AgendaEventSupport.java:75)
> 	at org.drools.reteoo.RuleTerminalNode.assertTuple(RuleTerminalNode.java:331)
> . . .

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