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This is broken in trunk, we will fix shortley.<br>
<br>
Mark<br>
Michael Neale wrote:
<blockquote
cite="mid:96ab3ced0705242148m4a7e31edq8317901f3d8c7e02@mail.gmail.com"
type="cite">Errors like that are not normal, and definitely indicates
a bug (ie not a compile error or anything - not something you should
have to debug). So some more information is needed like versions, how
you are running it, where the example came from etc (as there are a few
versions floating around).
<br>
<br>
<div><span class="gmail_quote">On 5/25/07, <b
class="gmail_sendername">Ming Fang</b> <<a moz-do-not-send="true"
href="mailto:mingfang@mac.com">mingfang@mac.com</a>> wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
I'm getting many of these errors when running the Sudoku Example<br>
<br>
java.lang.NullPointerException<br>
at org.drools.reteoo.ReteTuple.get(ReteTuple.java:71)<br>
at org.drools.common.InstanceNotEqualsConstraint
<br>
$InstanceNotEqualsConstraintContextEntry.updateFromTuple<br>
(InstanceNotEqualsConstraint.java:112)<br>
at org.drools.common.TripleBetaConstraints.updateFromTuple<br>
(TripleBetaConstraints.java:146)<br>
at org.drools.reteoo.NotNode.assertTuple(NotNode.java:108)<br>
at org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple<br>
(SingleTupleSinkAdapter.java:29)<br>
at org.drools.reteoo.NotNode.assertTuple(NotNode.java
:121)<br>
at org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple<br>
(SingleTupleSinkAdapter.java:29)<br>
at org.drools.reteoo.NotNode.assertTuple(NotNode.java:121)<br>
at<br>
org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTupl
<br>
e(CompositeTupleSinkAdapter.java:73)<br>
at org.drools.reteoo.LeftInputAdapterNode.assertObject<br>
(LeftInputAdapterNode.java:144)<br>
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
<br>
(CompositeObjectSinkAdapter.java:317)<br>
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:<br>
183)<br>
at org.drools.reteoo.Rete.assertObject(Rete.java:121)<br>
at org.drools.reteoo.ReteooRuleBase.assertObject
(ReteooRuleBase.java:<br>
201)<br>
at org.drools.reteoo.ReteooWorkingMemory.doAssertObject<br>
(ReteooWorkingMemory.java:70)<br>
at org.drools.common.AbstractWorkingMemory.assertObject<br>
(AbstractWorkingMemory.java
:735)<br>
at org.drools.base.DefaultKnowledgeHelper.assertObject<br>
(DefaultKnowledgeHelper.java:72)<br>
at org.drools.base.DefaultKnowledgeHelper.assertObject<br>
(DefaultKnowledgeHelper.java:66)<br>
at
<br>
org.drools.examples.sudoku.Rule_Rule_1__If_a_field_has_the_value_0__it_i<br>
s_empty__remove_it_and_insert_the_PossibleValues_0.consequence<br>
(Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_ins<br>
ert_the_PossibleValues_0.java:8)<br>
at<br>
org.drools.examples.sudoku.Rule_Rule_1__If_a_field_has_the_value_0__it_i<br>
s_empty__remove_it_and_insert_the_PossibleValues_0ConsequenceInvoker.eva<br>
luate<br>
(Rule_Rule_1__If_a_field_has_the_value_0__it_is_empty__remove_it_and_ins
<br>
ert_the_PossibleValues_0ConsequenceInvoker.java:22)<br>
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:<br>
497)<br>
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java
:461)<br>
at org.drools.common.AbstractWorkingMemory.fireAllRules<br>
(AbstractWorkingMemory.java:372)<br>
at org.drools.common.AbstractWorkingMemory.fireAllRules<br>
(AbstractWorkingMemory.java:353)<br>
at org.drools.examples.sudoku.SudokuExample.testWithInput<br>
(SudokuExample.java:52)<br>
at
org.drools.examples.sudoku.SudokuExample.main(SudokuExample.java:94)<br>
<br>
<br>
Besides the fact that these errors are naturally bad,
<br>
this points out the issue of Drools being very difficult debug when<br>
bad things happen.<br>
Can somebody give some tips of Drool debugging techniques?<br>
<br>
Thanks,<br>
--ming<br>
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</blockquote>
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<br>
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</blockquote>
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