Re: [rules-users] Combined OR/NOT Rules results in NullPointerException

Thanks for your reply. If I formulate the rules this way I get the following error from the KnowledgeBuilder: [21,4]: [ERR 102] Line 21:4 mismatched input 'not' expecting ')' in rule "R50" [24,66]: [ERR 102] Line 24:66 mismatched input ')' expecting 'then' in rule "R50 Best Regards Sebastian Furth 2010/3/29 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; > If you mean > > when > ( $value1: Value(...) > not Input(...) > or > $value2: Value(...) > not Input(...) ) > > $solution: SolutionInput(...) > then > ... > > you'll have to use parentheses. If not, what *do* you mean? > -W > > > On 3/29/10, Sebastian Furth <sebastian.furth(a)googlemail.com&gt; wrote: > > Hello, > > > > i've already mailed last week with the same problem and with your help I > was > > able to locate the source of the following NullPointerException which > > happens if we try to insert the Fact "knocking" (@see Source Code of the > > Java Class here: http://www.pastie.org/private/juv7hh7rxahpluo5agu3q) : > > > > *java.lang.NullPointerException > > at org.drools.reteoo.LeftTuple.get(LeftTuple.java:265) > > at org.drools.reteoo.LeftTuple.get(LeftTuple.java:300) > > at > > > org.drools.rule.VariableRestriction$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 > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >