Hi,
I want to reinforce statement from Geoffrey by saying that from roughly
10 memory corruptions I have had so far, 8 were caused by bugs in MY
identity/equality code!
If you write your own move implementations, here is one additional
example of the bug I have had and that have caused me sleepless nights
with sporadic memory corruption:
public class MyMove implements Move {
...
public void doMove(ScoreDirector scoreDirector) {
scoreDirector.beforeVariableChanged(myPlanningVariableInstance,
"myPlanningVariable");
myPlaningVariableInstance.setValue(toValue);
scoreDirector.beforeVariableChanged(myPlanningVariableInstance,
"myPlanningVariable"); //notice how I use beforeVariableChanged instead
of afterVariableChanged...
}
}
br
Reinis
On 01/10/2013 03:30 PM, Geoffrey De Smet wrote:
Op 10-01-13 10:54, Michiel Vermandel schreef:
> Hi,
>
> While running a planning I get after about 5 minutes a score corruption:
>
> Exception in thread "main" java.lang.IllegalStateException: Score
> corruption: the workingScore (-33hard/0soft) is not the
> uncorruptedScore (-23hard/0soft):
> The workingMemory has 1 ConstraintOccurrence(s) in excess:
> noConsecutiveIV/NEGATIVE_HARD:[Inspection of B747-AX145.I#1
> -233344192, Inspection of B737-AC126.I#1 -24157252, Andy]=10
> Check the score rules who created those ConstraintOccurrences.
> Verify that each ConstraintOccurrence's causes and weight is correct.
>
> This occurs in the localSearch phase (when only running the
> construction heuristic phase, I do not get this exception).
>
> How do I start in tackling this issue?
Start by looking at the "causes" vararg parameter you're giving to new
IntConstraintOccurrence,
including the equals/hashCode() of each of those elements.
Read up about insertLogical in the Drools Expert manual.
PS: for 6.0 we're working on unmatchListeners which would allow us to
avoid the insertLogical and the "causes" parameter.
>
> Thanks a lot!
>
> Michiel
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