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

[Edson Tirelli]

   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>:
>
> 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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