[jboss-jira] [JBoss JIRA] (JBRULES-3439) NPE in AbstractTabuAcceptor.stepTaken
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https://issues.jboss.org/browse/JBRULES-3439?page=com.atlassian.jira.plug...
]
Chris Dolan commented on JBRULES-3439:
--------------------------------------
Yes, that's the exact spot in the code.
I put a breakpoint in the code with condition "oldTabuStepIndexInteger == null".
I found that oldTabu is an instance of my planning entity class. That instance also
appears in the tabuToStepIndexMap, but the map has cached the **wrong hashCode**! So, it
appears that my planning entity instance was mutated after it was added to the map. That
should be impossible, right? My cloneSolution() method in my solution class carefully
deep-clones the planning entity instances so they can't propagate to other solutions.
Either I need to change my .hashCode() and .equals() of my planning entity class to ignore
the planning variable (is that the point of the .solutionHashCode()? I've been
wondering what that's all about...) or else there's a bug in the tabu code?
NPE in AbstractTabuAcceptor.stepTaken
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Key: JBRULES-3439
URL: https://issues.jboss.org/browse/JBRULES-3439
Project: Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: drools-planner
Affects Versions: 5.4.0.Beta2
Environment: drools-planner-example 5.4.0-SNAPSHOT pulled via Maven on March 29.
I believe this corresponds to
https://github.com/droolsjbpm/drools-planner/commit/ba38344b7563830eb2a72...
Reporter: Chris Dolan
Assignee: Geoffrey De Smet
Priority: Critical
I know this is a weak bug report and I apologize in advance for that...
I'm writing integration tests for my solver configuration. My code seems to work in
my GUI (subclass of CommonApp) but it fails under my junit test. I'm quite new to
Drools and Planner so I wouldn't be surprised if the root cause is my fault, but I
think a NPE is bad news.
{noformat}
2012-03-30 15:26:05,743 INFO [DefaultSolver.java:172] Solving started: time spend (25),
score (-2hard/-26soft), new best score (-2hard/-26soft), random seed (0). -
o.d.p.c.s.DefaultSolver
2012-03-30 15:26:05,786 DEBUG [DefaultLocalSearchSolverPhase.java:109] Step index
(0), time spend (68), score (-1hard/-22soft), new best score (-1hard/-22soft), accepted
move size (8) for picked step (JobSlot(s2,0) => Job(j1)). -
o.d.p.c.l.DefaultLocalSearchSolverPhase
2012-03-30 15:26:05,815 DEBUG [DefaultLocalSearchSolverPhase.java:109] Step index
(1), time spend (97), score (0hard/-8soft), new best score (0hard/-8soft), accepted move
size (11) for picked step (JobSlot(s1,0) => Job(j2)). -
o.d.p.c.l.DefaultLocalSearchSolverPhase
2012-03-30 15:26:05,831 DEBUG [DefaultLocalSearchSolverPhase.java:109] Step index
(2), time spend (113), score (0hard/-4soft), new best score (0hard/-4soft), accepted move
size (13) for picked step (JobSlot(s1,1) => Job(j1)). -
o.d.p.c.l.DefaultLocalSearchSolverPhase
2012-03-30 15:26:05,845 DEBUG [DefaultLocalSearchSolverPhase.java:109] Step index
(3), time spend (127), score (0hard/-2soft), new best score (0hard/-2soft), accepted move
size (13) for picked step (JobSlot(s2,1) => Job(j2)). -
o.d.p.c.l.DefaultLocalSearchSolverPhase
java.lang.NullPointerException
at
org.drools.planner.core.localsearch.decider.acceptor.tabu.AbstractTabuAcceptor.stepTaken(AbstractTabuAcceptor.java:163)
at
org.drools.planner.core.localsearch.decider.DefaultDecider.stepTaken(DefaultDecider.java:167)
at
org.drools.planner.core.localsearch.DefaultLocalSearchSolverPhase.stepTaken(DefaultLocalSearchSolverPhase.java:107)
at
org.drools.planner.core.localsearch.DefaultLocalSearchSolverPhase.solve(DefaultLocalSearchSolverPhase.java:71)
at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:181)
at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:150)
{noformat}
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