无法从drools的工作内存中加载DRL文件中的事实

Question

我有一个Planning Solution类，其中包含一个getProblemFacts（）方法，用于在工作内存中加载事实。 但是我无法在DRL文件中获得事实。

部分代码段如下：

@Override
    public Collection<? extends Object> getProblemFacts() {
        List<Object> facts = new ArrayList<Object>();
        facts.add(users);
        facts.add(resources);
        facts.add(availabilityList);
        facts.add(fromDate);
        facts.add(toDate);
        return facts
    }

DRL档案：

rule Rule4
when
    $users : org.volcare.brms.event.User(userName == "User10") 
    //$value : org.volcare.brms.event.User() from $users
then
    System.out.println("Test");
end

配置文件是：

<?xml version="1.0" encoding="UTF-8"?>
<solver>
  <solutionClass>org.volcare.brms.event.EventSolution</solutionClass>
  <planningEntityClass>com.volcare.brms.EventPlanning</planningEntityClass>

  <scoreDirectorFactory>
    <scoreDefinitionType>HARD_SOFT</scoreDefinitionType>
     <scoreDrl>/eventrule.drl</scoreDrl>
  </scoreDirectorFactory>
  <termination>
    <maximumSecondsSpend>90</maximumSecondsSpend>
  </termination>

  <constructionHeuristic>
    <constructionHeuristicType>FIRST_FIT</constructionHeuristicType>
  </constructionHeuristic>

  <localSearch>
    <unionMoveSelector>
      <changeMoveSelector>
        <valueSelector>
          <variableName>eventDate</variableName>
        </valueSelector>
      </changeMoveSelector>
    </unionMoveSelector>
    <acceptor>
      <entityTabuRatio>0.2</entityTabuRatio>
      <lateAcceptanceSize>500</lateAcceptanceSize>
    </acceptor>
    <forager>
      <acceptedCountLimit>4</acceptedCountLimit>
    </forager>
  </localSearch>
</solver>

可在DRL文件中访问规划实体。 如果我错过了什么，请告诉我。