[rules-users] Sudoku Example Errors

[webbo]

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

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