7 p.m.
Have you tried removing the or and just splitting it into two separate rules?
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Sebastian Furth
Sent: 29 March 2010 09:37
To: Rules Users List
Subject: [rules-users] Combined OR/NOT Rules results in NullPointerException
Hello,
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:
http://www.pastie.org/private/juv7hh7rxahpluo5agu3q) :
java.lang.NullPointerException
at org.drools.reteoo.LeftTuple.get(LeftTuple.java:265)
at org.drools.reteoo.LeftTuple.get(LeftTuple.java:300)
at
org.drools.rule.VariableRestriction$ObjectVariableContextEntry.updateFromTuple(VariableRestriction.java:320)
at
org.drools.common.SingleBetaConstraints.updateFromTuple(SingleBetaConstraints.java:119)
at org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:98)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:34)
at org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:123)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:145)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:57)
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216)
at de.d3web.we.drools.DroolsAction.addFacts(DroolsAction.java:334)
The source of the problem is the following rule:
rule "R50"
when
$value1 : Value(value == "knocking")
not Input(name == "Engine noises" && values contains $value1)
or
$value2 : Value(value == "ringing")
not Input(name == "Engine noises" && values contains $value2)
$solution : SolutionInput(name == "Bad ignition timing")
then
$solution.setValue(N3);
end
Could you please tell me how I have to formulate the rule to avoid the
NullPointerException while inserting the fact?
Thank you in advance for your help.
Best regards
Sebastian Furth
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