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:* [EMAIL PROTECTED]
[EMAIL PROTECTED] On Behalf Of Anstis, Michael
(M.) [EMAIL PROTECTED]
*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:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *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 <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>:
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
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--
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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