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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Have you tried removing the or and just splitting it into two separate rules?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Sebastian Furth<br>
<b>Sent:</b> 29 March 2010 09:37<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> [rules-users] Combined OR/NOT Rules results in NullPointerException<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hello,<br>
<br>
i've already mailed last week with the same problem and with your help I was able to locate the source of the following NullPointerException which happens if we try to insert the Fact "knocking" (@see Source Code of the Java Class here:
<a href="http://www.pastie.org/private/juv7hh7rxahpluo5agu3q">http://www.pastie.org/private/juv7hh7rxahpluo5agu3q</a>) :<o:p></o:p></p>
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<p class="MsoNormal"><b>java.lang.NullPointerException<br>
at org.drools.reteoo.LeftTuple.get(LeftTuple.java:265)<br>
at org.drools.reteoo.LeftTuple.get(LeftTuple.java:300)<br>
at org.drools.rule.VariableRestriction$ObjectVariableContextEntry.updateFromTuple(VariableRestriction.java:320)<br>
at org.drools.common.SingleBetaConstraints.updateFromTuple(SingleBetaConstraints.java:119)<br>
at org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:98)<br>
at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<br>
at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:34)<br>
at org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:123)<br>
at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:145)<br>
at org.drools.reteoo.CompositeLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:57)<br>
at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)<br>
at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)<br>
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)<br>
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)<br>
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)<br>
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)<br>
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)<br>
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)<br>
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)<br>
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)<br>
at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216)<br>
at de.d3web.we.drools.DroolsAction.addFacts(DroolsAction.java:334)</b><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
The source of the problem is the following rule:<o:p></o:p></p>
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<p class="MsoNormal"><b>rule "R50"<br>
when<br>
$value1 : Value(value == "knocking")<br>
not Input(name == "Engine noises" && values contains $value1)<br>
or<br>
$value2 : Value(value == "ringing")<br>
not Input(name == "Engine noises" && values contains $value2)<br>
$solution : SolutionInput(name == "Bad ignition timing")<br>
then<br>
$solution.setValue(N3);<br>
end</b><o:p></o:p></p>
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<p class="MsoNormal"><br>
Could you please tell me how I have to formulate the rule to avoid the NullPointerException while inserting the fact?<br>
<br>
Thank you in advance for your help.<br>
<br>
Best regards<br>
<br>
Sebastian Furth<o:p></o:p></p>
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