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@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@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users