Re: [rules-users] Sudoku Example Errors

Hi Ming, I'm currently having a look at this - see my earlier post... as far as I can tell it might something to do with the setRemoveIdentities flag - but still cannot trace it through - but will keep you posted on my progress. Steve Ming Fang wrote: > > Hi, > I'm getting many of these errors when running the Sudoku Example > > java.lang.NullPointerException > at org.drools.reteoo.ReteTuple.get(ReteTuple.java:71) > at org.drools.common.InstanceNotEqualsConstraint > $InstanceNotEqualsConstraintContextEntry.updateFromTuple > (InstanceNotEqualsConstraint.java:112) > at org.drools.common.TripleBetaConstraints.updateFromTuple > (TripleBetaConstraints.java:146) > at org.drools.reteoo.NotNode.assertTuple(NotNode.java:108) > at org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple > (SingleTupleSinkAdapter.java:29) > at org.drools.reteoo.NotNode.assertTuple(NotNode.java:121) > at org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple > (SingleTupleSinkAdapter.java:29) > at org.drools.reteoo.NotNode.assertTuple(NotNode.java:121) > at > org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTupl > e(CompositeTupleSinkAdapter.java:73) > at org.drools.reteoo.LeftInputAdapterNode.assertObject > (LeftInputAdapterNode.java:144) > at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject > (CompositeObjectSinkAdapter.java:317) > at org.drools.reteoo.ObjectTypeNode.assertObject( ObjectTypeNode.java: > 183) > at org.drools.reteoo.Rete.assertObject(Rete.java:121) > at org.drools.reteoo.ReteooRuleBase.assertObject( ReteooRuleBase.java: > 201) > at org.drools.reteoo.ReteooWorkingMemory.doAssertObject > (ReteooWorkingMemory.java:70) > at org.drools.common.AbstractWorkingMemory.assertObject > (AbstractWorkingMemory.java:735) > at org.drools.base.DefaultKnowledgeHelper.assertObject > (DefaultKnowledgeHelper.java:72) > at org.drools.base.DefaultKnowledgeHelper.assertObject > (DefaultKnowledgeHelper.java:66) > at > org.drools.examples.sudoku.Rule_Rule_1__If_a_field_has_the_value_0__it_i > s_empty__remove_it_and_insert_the_PossibleValues_0.consequence > (Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_ins > ert_the_PossibleValues_0.java:8) > at > org.drools.examples.sudoku.Rule_Rule_1__If_a_field_has_the_value_0__it_i > s_empty__remove_it_and_insert_the_PossibleValues_0ConsequenceInvoker.eva > luate > (Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_ins > ert_the_PossibleValues_0ConsequenceInvoker.java:22) > at org.drools.common.DefaultAgenda.fireActivation( DefaultAgenda.java: > 497) > at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java :461) > at org.drools.common.AbstractWorkingMemory.fireAllRules > (AbstractWorkingMemory.java:372) > at org.drools.common.AbstractWorkingMemory.fireAllRules > (AbstractWorkingMemory.java:353) > at org.drools.examples.sudoku.SudokuExample.testWithInput > (SudokuExample.java:52) > at org.drools.examples.sudoku.SudokuExample.main( SudokuExample.java:94) > > > Besides the fact that these errors are naturally bad, > this points out the issue of Drools being very difficult debug when > bad things happen. > Can somebody give some tips of Drool debugging techniques? > > Thanks, > --ming > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Sudoku-Example-Errors-tf3814030.html#a10796945 Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users