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planning variable is NOT nullable. when I print out planning entity in variable listener for my shadow value, still in planning process NULL value still assign to planning variable??

planning entity:

 // Planning variables: changes during planning, between score calculations.
    @PlanningVariable(valueRangeProviderRefs = {"numberRange"})
    private Integer number;

    @ValueRangeProvider(id = "numberRange")
    private List<Integer> numberRange;

    @CustomShadowVariable(variableListenerClass = BoxUpdatingVariableListener.class,
            sources = {@PlanningVariableReference(variableName = "number")})
    private Integer shaodowNumber;

variable listener:

 protected void updateShadowNumber(ScoreDirector scoreDirector, Box sourceBox) {
        System.out.println("number:"+sourceBox.getNumber());
    }

part of result:

02:24:46.832 [main        ] INFO  Solving started: time spent (74), best score (-3init/-90), environment mode (FULL_ASSERT), random (JDK with seed 0).
number:1
number:null
number:2
number:null
number:3
number:null
number:4
number:null
number:5
number:null
number:6
number:null
number:7
number:null
number:7
number:7
number:null
number:null
02:24:46.883 [main        ] DEBUG     CH step (0), time spent (125), score (-2init/-43), selected move count (7), picked move (Box-1 {null -> 7}).
number:1
number:null
number:2
number:null
number:3
number:null
number:4
number:null
number:5
number:null
number:6
number:null
number:6
number:7
number:6
number:null
EeE
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1 Answers1

1

This is usually the result of not running a construction phase

https://docs.optaplanner.org/7.14.0.Final/optaplanner-docs/html_single/index.html#constructionHeuristics

like this for example

<constructionHeuristic>
  <constructionHeuristicType>STRONGEST_FIT_DECREASING</constructionHeuristicType>
</constructionHeuristic>
Kostas Papadakis
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