Question

我正在尝试使用Drools Workbench版本6.4.0 Final在KIE服务器中重新创建CloudBalancing示例。我可以通过REST API在KIE中创建容器和求解器，但是当我尝试开始解决时，我收到以下错误：

03:15:50,831 INFO  [org.kie.server.services.impl.KieServerImpl] (EJB default - 2) Container optacloud_1_0_0 (for release id opta:optacloud:1.0.0) successfully started
03:17:44,170 INFO  [org.kie.server.services.optaplanner.SolverServiceBase] (default task-13) Solver 'solver1' successfully created in container 'optacloud_1_0_0'
03:19:19,654 ERROR [org.kie.server.services.optaplanner.SolverServiceBase] (pool-9-thread-1) Exception executing solver 'solver1' from container 'optacloud_1_0_0'. Thread will terminate.: java.lang.NullPointerException
    at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333) [rt.jar:1.7.0_80]
    at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1125) [rt.jar:1.7.0_80]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:613) [drools-compiler-6.4.0.Final.jar:6.4.0.Final]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:575) [drools-compiler-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirectorFactory.newKieSession(DroolsScoreDirectorFactory.java:113) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.resetKieSession(DroolsScoreDirector.java:68) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.setWorkingSolution(DroolsScoreDirector.java:61) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.solver.scope.DefaultSolverScope.setWorkingSolutionFromBestSolution(DefaultSolverScope.java:198) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:196) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:175) [optaplanner-core-6.4.0.Final.jar:6.4.0.Final]
    at org.kie.server.services.optaplanner.SolverServiceBase$1.run(SolverServiceBase.java:329) [kie-server-services-optaplanner-6.4.0.Final.jar:6.4.0.Final]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_80]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_80]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_80]

是不是因为我错过了得分王＆＃39;在SolverConfig.xml中？如何通过Workbench UI配置SolverConfig.xml？看来我无法通过界面编辑SolverConfig.xml。

Answer 1

感谢Geoffrey的调查，他发现问题的根本原因与DROOLS-1276有关。该问题的解决方法是不使用默认的ksession。

在Drools工作台中创建一个激情如下：

Project Authoring ->  Open Project Editor -> Knowledge Bases and Sessions

然后在项目的Solver配置中更新知识会话。问题将得到解决。

optaplanner / drools workbench 6.4.0 Final ScoreDirectorFacotry

1 个答案: