Is any one having aproblem getting this to run - I get - 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.createAndPropagateAssertTuple( 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:724) at org.drools.base.DefaultKnowledgeHelper.assertObject( DefaultKnowledgeHelper.java:72) at org.drools.base.DefaultKnowledgeHelper.assertObject( DefaultKnowledgeHelper.java:66) at test.Rule_Rule_1__If_a_field_has_the_value_0__it_is_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_insert_the_PossibleValues_0.java:8) at test.Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_insert_the_PossibleValues_0ConsequenceInvoker.evaluate (Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_insert_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:373) at org.drools.common.AbstractWorkingMemory.fireAllRules( AbstractWorkingMemory.java:354) at test.SudokuExample.testWithInput(SudokuExample.java:52) at test.SudokuExample.main(SudokuExample.java:91) I'm working through the code - but anyone else found this? -- View this message in context: http://www.nabble.com/Sudoku-example-on-4.0-MR2-tf3813556.html#a10795330 Sent from the drools - dev mailing list archive at Nabble.com. _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev