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:
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
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.
Cheers,
Mike
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@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
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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
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