Jason Partyka wrote:
It looks like the bug is still in there.
I am attempting to resolve it myself, but in order to do so I need to
go into the MVEL code, but the mvel jar that is included as part of
the drools classpath container (within eclipse) is just mvel14.jar. So
I'm not sure where the source is or what version of MVEL source I
should be attaching. I realize that the source-location thing is just
an Eclipse issue, but I thought I'd let you know right away that it
looks like it's still there.
We strip jar version numbers to make deployment with Eclipse easier. If
you look at parent pom.xml it will tell you the version of MVEL used.
Anywhere you can point me to that would help with making sure I'm
looking the right code.
Thanks,
Jason
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*From:* [EMAIL PROTECTED]
[EMAIL PROTECTED] On Behalf Of Mark Proctor
[EMAIL PROTECTED]
*Sent:* Monday, March 10, 2008 8:17 AM
*To:* Rules Users List
*Subject:* Re: [rules-users] Interesting null pointer exception when
inserting afact.
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
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*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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