Re: [rules-users] drools-solver NPE in DefaultSimpleScore
By the way, if you turn on info logging,
it logs each time a new best solution is found.
If you see a null in there, that's the problem.
However, that logging guarantee doesn't apply if you hooked in a custom
BestSolutionRecaller etc
With kind regards,
Geoffrey De Smet
Geoffrey De Smet schreef:
Hi Andrew,
I can't reproduce your problem.
> The BestSolution is not null although the best score is.
The LocalSearchSolverScope cannot have a best solution and not a best score.
Could you debug to see where LocalSearchSolverScope.setBestSolution() is
called and why LocalSearchSolverScope.setBestScore() isn't called or is
called with a null argument?
With kind regards,
Geoffrey De Smet
Andrew Waterman schreef:
> Hi,
>
> I migrated some solver code that I had working on 5.0M4 to the 5.1.0
> implementation. I'm now seeing the following while running the solver:
>
> java.lang.NullPointerException
> at org.drools.solver.core.score.DefaultSimpleScore.compareTo
> (DefaultSimpleScore.java:73)
> at org.drools.solver.core.score.DefaultSimpleScore.compareTo
> (DefaultSimpleScore.java:13)
> at
> org.drools.solver.core.localsearch.bestsolution.BestSolutionRecaller.stepTaken
> (BestSolutionRecaller.java:56)
> at
> org.drools.solver.core.localsearch.DefaultLocalSearchSolver.stepTaken
> (DefaultLocalSearchSolver.java:171)
> at
> org.drools.solver.core.localsearch.DefaultLocalSearchSolver.solveImplementation
> (DefaultLocalSearchSolver.java:121)
> at org.drools.solver.core.AbstractSolver.solve(AbstractSolver.java:41)
>
> I ran my test with a debugger attached, and this call is returning a
> Null:
>
> Score bestScore = localSearchSolverScope.getBestScore();
> <org.drools.solver.core.localsearch.bestsolution.BestSolutionRecaller:
> 55>
>
> The BestSolution is not null although the best score is.
>
> Should I file an issue on this in JIRA? Or perhaps this reflects some
> change to the old code that I didn't migrate properly?
>
> best wishes,
>
> Andrew
>
>
>
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