构造问题 - selectorConfig (EntitySelectorConfig(null)) 没有 entityClass

Question

我声明了两个规划实体运行和学校，它们有自己的规划变量。在求解器配置中，每个实体都有单独的构造启发式方法，但存在一个问题，即 selectorConfig 没有实体 Class。使用 OptaPlanner 6.2.0。非常感谢任何帮助。

<constructionHeuristic>
    <queuedEntityPlacer>
        <entitySelector id="placerEntitySelector">
            <entityClass>org.optaplanner.examples.cloudbalancing.domain.Run</entityClass>
            <cacheType>PHASE</cacheType>
        </entitySelector>
        <changeMoveSelector>
            <entitySelector mimicSelectorRef="placerEntitySelector"/>
        </changeMoveSelector>
    </queuedEntityPlacer>
</constructionHeuristic>

<constructionHeuristic>
    <queuedEntityPlacer>
        <entitySelector id="placerEntitySelector">
            <entityClass>org.optaplanner.examples.cloudbalancing.domain.School</entityClass>
            <cacheType>PHASE</cacheType>
        </entitySelector>
        <changeMoveSelector>
            <entitySelector mimicSelectorRef="placerEntitySelector"/>
        </changeMoveSelector>
    </queuedEntityPlacer>
</constructionHeuristic>

堆栈跟踪

--- exec-maven-plugin:1.2.1:exec (default-cli) @ optaplanner-examples ---
Exception in thread "main" java.lang.IllegalArgumentException: The selectorConfig (EntitySelectorConfig(null)) has no entityClass (null) configured and because there are multiple in the entityClassSet ([class org.optaplanner.examples.cloudbalancing.domain.Run, class org.optaplanner.examples.cloudbalancing.domain.School]), it can not be deducted automatically.
 at org.optaplanner.core.config.heuristic.selector.SelectorConfig.deduceEntityDescriptor(SelectorConfig.java:81)
 at org.optaplanner.core.config.heuristic.selector.entity.EntitySelectorConfig.buildEntitySelector(EntitySelectorConfig.java:210)
 at org.optaplanner.core.config.heuristic.selector.move.generic.ChangeMoveSelectorConfig.buildBaseMoveSelector(ChangeMoveSelectorConfig.java:64)
 at org.optaplanner.core.config.heuristic.selector.move.MoveSelectorConfig.buildMoveSelector(MoveSelectorConfig.java:189)
 at org.optaplanner.core.config.heuristic.selector.move.composite.UnionMoveSelectorConfig.buildBaseMoveSelector(UnionMoveSelectorConfig.java:75)
 at org.optaplanner.core.config.heuristic.selector.move.MoveSelectorConfig.buildMoveSelector(MoveSelectorConfig.java:189)
 at org.optaplanner.core.config.localsearch.LocalSearchPhaseConfig.buildMoveSelector(LocalSearchPhaseConfig.java:143)
 at org.optaplanner.core.config.localsearch.LocalSearchPhaseConfig.buildDecider(LocalSearchPhaseConfig.java:108)
 at org.optaplanner.core.config.localsearch.LocalSearchPhaseConfig.buildPhase(LocalSearchPhaseConfig.java:93)
 at org.optaplanner.core.config.localsearch.LocalSearchPhaseConfig.buildPhase(LocalSearchPhaseConfig.java:46)
 at org.optaplanner.core.config.solver.SolverConfig.buildSolver(SolverConfig.java:205)
 at org.optaplanner.core.impl.solver.XStreamXmlSolverFactory.buildSolver(XStreamXmlSolverFactory.java:134)
 at org.optaplanner.examples.cloudbalancing.app.CloudBalancingHelloWorld.main(CloudBalancingHelloWorld.java:38)
------------------------------------------------------------------------
BUILD FAILURE

这里是移动选择器的定义。工作起来很有魅力。我采用了一种不同的方法来查看是否会比我原来的方法更好。我确实了解到，最佳实体和变量的选择并不总是显而易见的。我从我的原始解决方案中提取了一个粒度变量，并将其替换为一个粗略的实体和变量，该实体和变量无法针对任何 objective 进行增量评分。结果是增量评分规则阻止了课程实体和变量改变状态——并且不可能编写细粒度的评分规则。因此，在定义实体和变量时，它们应该能够支持 granular/incremental 评分。我原来的方法产生了预期的结果。

    <localSearch>
    <unionMoveSelector>
        <changeMoveSelector>
            <entitySelector>
                <entityClass>org.optaplanner.examples.cloudbalancing.domain.Run</entityClass>
            </entitySelector>
            <valueSelector>
                <variableName>vehicle</variableName>
            </valueSelector>
        </changeMoveSelector>
        <swapMoveSelector>
            <entitySelector>
                <entityClass>org.optaplanner.examples.cloudbalancing.domain.Run</entityClass>
            </entitySelector>
        </swapMoveSelector>
        <changeMoveSelector>
            <entitySelector>
                <entityClass>org.optaplanner.examples.cloudbalancing.domain.School</entityClass>
            </entitySelector>
            <valueSelector>
                <variableName>startTime</variableName>
            </valueSelector>
        </changeMoveSelector>
        <swapMoveSelector>
            <entitySelector>
                <entityClass>org.optaplanner.examples.cloudbalancing.domain.School</entityClass>
            </entitySelector>
        </swapMoveSelector>
    </unionMoveSelector>

...

Answer 1

异常发生在 LocalSearchPhaseConfig.build...()，而不是 ConstructionHeuristicPhaseCondif.build...()，所以这是您的 <localSearch> 配置的问题，没有粘贴到这里。

我怀疑你没有在那里配置 moveSelectors 而只是依赖于开箱即用的那些，如果有多个实体类或变量（I made a jira for that).

构造问题 - selectorConfig (EntitySelectorConfig(null)) 没有 entityClass

Construction issue - The selectorConfig (EntitySelectorConfig(null)) has no entityClass

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