java - 流口水最好成绩为空

Question

我正在使用 Drools 5.4.0.CR1，当我开始时

...
XmlSolverFactory configurer = new XmlSolverFactory();
configurer.configure(SOLVER_CONFIG);
Solver solver = configurer.buildSolver();
solver.setPlanningProblem(initialSolution);
solver.solve();
....

我有这个输出

[exec:exec]
2012-04-30 11:10:46,296 [main] INFO  Solving started: time spend (169), score (-13hard/0soft), new best score (-13hard/0soft), random seed (0).
2012-04-30 11:10:46,338 [main] DEBUG     Step index (0), time spend (213), score (-12hard/0soft), new best score (null), accepted move size (10) for picked step (03-05-2012 P emp:EMPLOYEE1 => L).
2012-04-30 11:10:46,356 [main] DEBUG     Step index (1), time spend (231), score (-12hard/0soft), new best score (null), accepted move size (10) for picked step (02-05-2012 P emp:EMPLOYEE2 => S).
java.lang.NullPointerException
    at org.drools.planner.core.score.buildin.hardandsoft.DefaultHardAndSoftScore.compareTo(DefaultHardAndSoftScore.java:125)
    at org.drools.planner.core.score.buildin.hardandsoft.DefaultHardAndSoftScore.compareTo(DefaultHardAndSoftScore.java:27)
    at org.drools.planner.core.localsearch.decider.acceptor.tabu.AbstractTabuAcceptor.isAccepted(AbstractTabuAcceptor.java:121)
    at org.drools.planner.core.localsearch.decider.acceptor.CompositeAcceptor.isAccepted(CompositeAcceptor.java:58)
    at org.drools.planner.core.localsearch.decider.DefaultDecider.processMove(DefaultDecider.java:159)

这是 TRACE 日志:

2012-04-30 11:40:16,745 [main] INFO  Solving started: time spend (110), score (-13hard/0soft), new best score (-13hard/0soft), random seed (0).
    2012-04-30 11:40:16,781 [main] TRACE         Move score (-13hard/0soft), accepted (true) for move (01-05-2012 M emp:EMPLOYEE1 => P).
    2012-04-30 11:40:16,794 [main] TRACE         Move score (-13hard/0soft), accepted (true) for move (04-05-2012 L emp:EMPLOYEE2 => G).
    2012-04-30 11:40:16,794 [main] TRACE         Ignoring not doable move (01-05-2012 P emp:EMPLOYEE3 => P).
    2012-04-30 11:40:16,807 [main] TRACE         Move score (-13hard/0soft), accepted (true) for move (01-05-2012 M emp:EMPLOYEE4 => S).
    2012-04-30 11:40:16,819 [main] TRACE         Move score (-13hard/0soft), accepted (true) for move (03-05-2012 P emp:EMPLOYEE5 => A).
    ...
    2012-04-30 11:40:16,876 [main] TRACE         Move score (-12hard/0soft), accepted (true) for move (03-05-2012 P emp:EMPLOYEE21 => L).
    2012-04-30 11:40:16,876 [main] TRACE         Ignoring not doable move (01-05-2012 L emp:EMPLOYEE22 => L).
    2012-04-30 11:40:16,876 [main] TRACE         Ignoring not doable move (03-05-2012 N emp:EMPLOYEE23 => N).
    2012-04-30 11:40:16,887 [main] TRACE         Move score (-13hard/0soft), accepted (true) for move (02-05-2012 N emp:EMPLOYEE14 => TS).
    2012-04-30 11:40:16,898 [main] DEBUG     Step index (0), time spend (265), score (-12hard/0soft), new best score (null), accepted move size (10) for picked step (03-05-2012 P emp:EMPLOYEE21 => L).

似乎最佳解决方案并未随分数值更新，但我们将解决方案类定义为带有 getter 和 setter 分数的示例(queens 示例)。

有人对“新的最佳成绩”为空有任何建议吗？

谢谢!

Answer 1

大胆猜测，但是您的解决方案的cloneSolution是否能够可靠地克隆分数和所有其他问题事实？

我在那里遇到了一些无声错误。