Created a JIRA.
-W
On 24/06/2013, Wolfgang Laun <wolfgang.l...@gmail.com> wrote:
> Below is a self-contained DRL file where Drools crashes during evaluation
> at runtime, even though it compiles and appears to be correct.
>
> package pythagoras;
>
> rule "kickoff"
> salience 100
> when
> then
> for( Integer i: new Integer[]{3,4,5,12,13 } ){
> insert( i );
> }
> end
>
> rule "find triple forward"
> when
> Integer( $a: intValue )
> Integer( $b: intValue > $a )
> Integer( $c: intValue > $b )
> eval( $a*$a + $b*$b == $c*$c )
> then
> System.out.println( "fwd: " + $a + " " + $b + " " + $c );
> end
>
> query isTriple( Integer $a, Integer $b, Integer $c )
> Integer( intValue == $a )
> Integer( intValue == $b && > $a )
> Integer( intValue == $c && > $b )
> eval( $a*$a + $b*$b == $c*$c )
> end
>
> rule "find triple backward"
> when
> isTriple( $a, $b, $c; )
> then
> System.out.println( "bwd: " + $a + " " + $b + " " + $c );
> end
>
>
> On 21/06/2013, Mark Proctor <mproc...@codehaus.org> wrote:
>> Can you submit a pull request against master, 6.x, with the test. Put it
>> in
>> BackwardChainingTest. We'll back port the test and fix to 5.x.
>>
>> thanks
>>
>> Mark
>> On 21 Jun 2013, at 16:00, Wolfgang Laun <wolfgang.l...@gmail.com> wrote:
>>
>>> Trying to use eval in a query for backward chaining causes a runtime
>>> crash running Drools 5.5.0. Looks like a bug. The details:
>>>
>>> Given some Integer objects as facts,
>>> rule "find triple forward"
>>> when
>>> Integer( $a: intValue )
>>> Integer( $b: intValue > $a )
>>> Integer( $c: intValue > $b )
>>> eval( $a*$a + $b*$b == $c*$c )
>>> then
>>> System.out.println( "fwd: " + $a + " " + $b + " " + $c );
>>> end
>>> finds Pythagorean triples.
>>>
>>> But
>>> query isTriple( Integer $a, Integer $b, Integer $c )
>>> Integer( intValue == $a )
>>> Integer( intValue == $b && > $a )
>>> Integer( intValue == $c && > $b )
>>> eval( $a*$a + $b*$b == $c*$c )
>>> end
>>> intended to be used in combination with
>>> rule "find triple backward"
>>> when
>>> isTriple( $a, $b, $c; )
>>> then
>>> System.out.println( "bwd: " + $a + " " + $b + " " + $c );
>>> end
>>> causes a nasty runtime error (although DRL compilation succeeds):
>>> Exception in thread "main" java.lang.NoSuchMethodError:
>>> pythagoras.Rule_isTriple_17ac16f7237046ee9562afce35dfe174.eval0(III)Z
>>> at
>>> pythagoras.Rule_isTriple_17ac16f7237046ee9562afce35dfe174Eval0InvokerGenerated.evaluate(Unknown
>>> Source)
>>> at
>>> pythagoras.Rule_isTriple_17ac16f7237046ee9562afce35dfe174Eval0Invoker.evaluate(Unknown
>>> Source)
>>> at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
>>> at
>>> org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:176)
>>> at
>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>>> at
>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
>>> at org.drools.reteoo.JoinNode.propagateFromRight(JoinNode.java:159)
>>> at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:148)
>>> at
>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>>> at
>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>>> at
>>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>>> at
>>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
>>> at
>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>>> at
>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
>>> at
>>> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
>>> at pythagoras.Main.makeFacts(Main.java:94)
>>> at pythagoras.Main.execute(Main.java:78)
>>> at pythagoras.Main.main(Main.java:103)
>>>
>>> -W
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-us...@lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>> _______________________________________________
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>> rules-us...@lists.jboss.org
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>>
>
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