[rules-users] Interesting null pointer exception when inserting afact.

[Mark Proctor]

please check with 4.0.x, which will be in 4.0.5 this week, and let us 
know if this is fixed or not. But hurry we are releasing 4.0.5 very soon:
http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/

Mark
Jason Partyka wrote:
> I can give this a shot, but the reason why you suggest this is not 
> obvious to me.
>  
> Have you encountered this problem yourself?
>  
> -Jason
>  
>  
>  
> ------------------------------------------------------------------------
> *From:* rules-users-bounces at lists.jboss.org 
> [rules-users-bounces at lists.jboss.org] On Behalf Of Anstis, Michael 
> (M.) [manstis1 at ford.com]
> *Sent:* Monday, March 10, 2008 5:06 AM
> *To:* Rules Users List
> *Subject:* RE: [rules-users] Interesting null pointer exception when 
> inserting afact.
>
> I'm no expert but recall there can be problems running "long 
> running" (subjective) code from AWT's worker thread.
>  
> I thought it was good practice to run your "application code" in a 
> worker thread. This was the first google hit I had on the matter. 
>  
> http://www.cs.helsinki.fi/u/vihavain/k03/Java/JavathreadsandGUI.html
>  
> Cheers,
>  
> Mike
>
>     ------------------------------------------------------------------------
>     *From:* rules-users-bounces at lists.jboss.org
>     [mailto:rules-users-bounces at lists.jboss.org] *On Behalf Of *Edson
>     Tirelli
>     *Sent:* 08 March 2008 13:15
>     *To:* Rules Users List
>     *Subject:* Re: [rules-users] Interesting null pointer exception
>     when inserting afact.
>
>
>        Jason,
>
>        Can you please isolate and show us the rule that is creating
>     the problem? It is happening either in a eval() statement or in a
>     nested property access.
>
>         []s
>         Edson
>
>     2008/3/7, Jason Partyka <Jason.Partyka at hightowerinc.com
>     <mailto:Jason.Partyka at hightowerinc.com>>:
>
>         Hi,
>
>         This is in relation to drools 4.0.4
>
>         I have an interesting problem. I am getting a null pointer
>         exception when I am inserting a fact into a StatefulSession
>         object. What is odd about this NPE is that, as far as I can
>         tell (and I have inserted a breakpoint right before I insert
>         the fact) that all the properties in the object are
>         initialized, and there are no rules accessing any thing that
>         could be null.
>
>         So here's my exception trace (just first few lines to get
>         context):
>
>         Exception in thread "AWT-EventQueue-0"
>         org.drools.RuntimeDroolsException: java.lang.NullPointerException
>           at
>         org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:76)
>           at
>         org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:145)
>           at
>         org.drools.reteoo.SingleTupleSinkAdapter.createAndPropagateAssertTuple(SingleTupleSinkAdapter.java:55)
>           at
>         org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116)
>           at
>         org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22)
>           at
>         org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
>           at org.drools.reteoo.Rete.assertObject(Rete.java:177)
>           at
>         org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
>           at
>         org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
>           at
>         org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
>           at
>         org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:858)
>           at
>         org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:659)
>           at
>         com.hightower.drools.executablerules.Rules.setTemplate(Rules.java:112)
>         ....
>         Caused by: java.lang.NullPointerException
>           at
>         org.drools.base.mvel.MVELEvalExpression.evaluate(MVELEvalExpression.java:39)
>           at
>         org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:72)
>           ... 39 more
>
>
>         (that setTemplate method is not a drools template)
>
>         Any ideas?
>
>         Thanks,
>         Jason
>
>         _______________________________________________
>         rules-users mailing list
>         rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org>
>         https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
>     -- 
>       Edson Tirelli
>       JBoss Drools Core Development
>       Office: +55 11 3529-6000
>       Mobile: +55 11 9287-5646
>       JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com> 
>
> ------------------------------------------------------------------------
>
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>   

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