未初始化的计划值[错误]

Question

是否可以将未初始化的计划值的计划实体设置为解决方案？

如果有可能的话那怎么样？ :)

PLZ，帮我:)

当我不为null规划变量的一切执行我的代码工作正常，但是当我执行不设置规划变量我有[Exception in thread "main" java.lang.NullPointerException]

2012-02-14 17:32:08,119 [main] INFO Solver started: time spend (0), score (null), new best score (null), random seed (0). 
Exception in thread "main" java.lang.NullPointerException 
     at org.drools.planner.core.score.definition.HardAndSoftScoreDefinition.calculateTimeGradient(HardAndSoftScoreDefinition.java:73) 
     at org.drools.planner.core.score.definition.HardAndSoftScoreDefinition.calculateTimeGradient(HardAndSoftScoreDefinition.java:25) 
     at org.drools.planner.core.termination.ScoreAttainedTermination.calculateSolverTimeGradient(ScoreAttainedTermination.java:52) 
     at org.drools.planner.core.termination.OrCompositeTermination.calculateSolverTimeGradient(OrCompositeTermination.java:70) 
     at org.drools.planner.core.termination.OrCompositeTermination.calculateSolverTimeGradient(OrCompositeTermination.java:70) 
     at org.drools.planner.core.termination.PhaseToSolverTerminationBridge.calculatePhaseTimeGradient(PhaseToSolverTerminationBridge.java:49) 
     at org.drools.planner.core.localsearch.DefaultLocalSearchSolverPhase.solve(DefaultLocalSearchSolverPhase.java:55) 
     at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:166) 
     at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:138) 
     at kz.bee.drools.planner.dating.DatingMain.start(DatingMain.java:58) 
     at kz.bee.drools.planner.dating.DatingMain.main(DatingMain.java:38) 

这里是我的代码：

package kz.bee.drools.planner.dating; 

import java.util.ArrayList; 
import java.util.List; 

import org.apache.log4j.xml.DOMConfigurator; 
import org.drools.planner.config.XmlSolverConfigurer; 
import org.drools.planner.core.Solver; 
import org.drools.planner.core.event.BestSolutionChangedEvent; 
import org.drools.planner.core.event.SolverEventListener; 
import org.drools.planner.core.solution.Solution; 
import org.drools.planner.core.solver.DefaultSolverScope; 


public class DatingMain { 

public static final int PERSON_PER_GENDER = 10; 

public static final int HOUR_COUNT = 5; 

public static final int TABLE_COUNT = 5; 

public static final String SOLVER_CONFIG 
    = "/datingSolverConfig.xml"; 

private volatile Solver solver; 

public DatingMain() { 
    DOMConfigurator.configure(getClass().getResource("/log4j-test.xml")); 
} 

public static void main(String[] args) { 
    DatingMain datingMain = new DatingMain(); 
    datingMain.init(); 
    datingMain.start(); 
} 

private void init() { 
    XmlSolverConfigurer configurer = new XmlSolverConfigurer(); 
    configurer.configure(SOLVER_CONFIG); 
    solver = configurer.buildSolver(); 
    this.solver.addEventListener(new SolverEventListener() { 
     public void bestSolutionChanged(BestSolutionChangedEvent event) { 
      Dating dating = (Dating) solver.getBestSolution(); 

      print(dating); 
     } 

    }); 
    setPlanningProblem(); 
} 

private void start() { 
    System.out.println("Start solving ..."); 
    this.solver.solve(); 

    Dating dating = (Dating) solver.getBestSolution(); 


    System.out.println("Best solution:"); 

    print(dating); 

    System.out.println("End solving."); 
} 

private void setPlanningProblem() { 
    List<Table> tableList = new ArrayList<Table>(); 
    List<Hour> hourList = new ArrayList<Hour>(); 
    List<Man> manList = new ArrayList<Man>(); 
    List<Woman> womanList = new ArrayList<Woman>(); 
    List<Meeting> meetingList = new ArrayList<Meeting>(); 


    for(int i = 0; i < TABLE_COUNT; i++) { 
     Table t = new Table(); 
     t.setId(Long.parseLong(""+i)); 
     t.setNumber(i+10); 

     tableList.add(t); 
    } 

    for(int i = 0; i < HOUR_COUNT; i++) { 
     Hour h = new Hour(); 
     h.setId(Long.parseLong(""+i)); 
     h.setValue(i+1); 

     hourList.add(h); 
    } 


    for(int j = 0; j < PERSON_PER_GENDER; j++) { 
     Man m = new Man(); 
     m.setId(Long.parseLong(""+j)); 
     m.setName("Mr. #"+(j+1)); 
     //m.setSuggestionList(new ArrayList<Long>()); 
     if(j == 0) { 
      m.setSuggestionList(new ArrayList<Long>()); 
      m.getSuggestionList().add(7L); 
     } 
     else if(j == 1) { 
      m.setSuggestionList(new ArrayList<Long>()); 
      m.getSuggestionList().add(4L); 
      m.getSuggestionList().add(8L); 
     } 

     Woman w = new Woman(); 
     w.setId(Long.parseLong(""+j)); 
     w.setName("Ms. #"+(j+1)); 

     manList.add(m); 
     womanList.add(w); 
    } 

// manList.add（null）; // womanList.add（null）;

System.out.println("man & woman list size = " + manList.size() + " & " + womanList.size()); 

    for(int j = 0; j < hourList.size(); j++) { 
     for(int i = 0; i < tableList.size(); i++) { 
      Meeting m = new Meeting(); 
      m.setId(Long.parseLong(""+(j*hourList.size() + i))); 
      m.setTable(tableList.get(i)); 
      m.setHour(hourList.get(j)); 

// m.setMan（null）; // m.setWoman（null）; //m.setMan(manList.get(i））; //m.setWoman(womanList.get((i+j）％10））;

  meetingList.add(m); 
     } 
    } 

    Dating dating = new Dating(); 
    dating.setId(Long.parseLong("1")); 
    dating.setTableList(tableList); 
    dating.setHourList(hourList); 
    dating.setManList(manList); 
    dating.setWomanList(womanList); 
    dating.setMeetingList(meetingList); 

    this.solver.setPlanningProblem((Solution) dating); 
} 

private void print(Dating dating) { 
    List<Meeting> meetingList = dating.getMeetingList(); 

    System.out.println("==============================="); 
    for(Meeting m : meetingList) { 
     System.out.printf("# %3s ",m.getId()); 
     System.out.println(" t:" + m.getTable().getNumber() + " h:"+ m.getHour().getValue() + " m:"+m.getMan() + " w:" + m.getWoman()); 
    } 
    System.out.println("Score (h/s): " + dating.getScore().getHardScore() + "/" + dating.getScore().getSoftScore() + " time: " + solver.getTimeMillisSpend()); 

    System.out.println("==============================="); 
} 
} 

`

sovlerConfig的XML

<?xml version="1.0" encoding="UTF-8"?> 
<solver> 
    <solutionClass>kz.bee.drools.planner.dating.Dating</solutionClass> 
    <planningEntityClass>kz.bee.drools.planner.dating.Meeting</planningEntityClass> 
    <scoreDrl>/datingScoreRules.drl</scoreDrl> 
    <scoreDefinition> 
     <scoreDefinitionType>HARD_AND_SOFT</scoreDefinitionType> 
    </scoreDefinition> 
    <termination> 
     <terminationCompositionStyle>OR</terminationCompositionStyle> 
     <scoreAttained>0hard/1000soft</scoreAttained> 
     <maximumSecondsSpend>30</maximumSecondsSpend> 
    </termination> 
    <localSearch> 
     <selector> 
      <selector> 
        <moveFactoryClass>kz.bee.drools.planner.dating.solver.move.factory.ManChangeMoveFactory</moveFactoryClass> 
     </selector> 
     <selector> 
      <moveFactoryClass>kz.bee.drools.planner.dating.solver.move.factory.WomanChangeMoveFactory</moveFactoryClass> 
     </selector> 
    </selector> 
    <acceptor> 
     <completeSolutionTabuSize>1500</completeSolutionTabuSize> 
    </acceptor> 
    <forager> 
     <!-- <pickEarlyType>NEVER</pickEarlyType> --> 
    </forager> 
</localSearch> 

Answer 1

在你solverConfig，你的<localSearch>部分之前缺少<constructionHeuristic>部分（使用FIRST_FIT），请参阅手册，了解更多信息或大多数例子。

当发生这种情况时，我会提交一个JIRA以获得更好的异常消息。