[rules-users] drools-solver NPE in DefaultSimpleScore

[Geoffrey De Smet]

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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