org.optaplanner.core.api.domain.solution

## Annotation Type ProblemFactCollectionProperty

-     @Target(value={METHOD,FIELD})
       @Retention(value=RUNTIME)
      public @interface ProblemFactCollectionProperty

  Specifies that a property (or a field) on a `PlanningSolution` class is a `Collection` of problem facts. A problem fact must not change during solving (except through a `ProblemFactChange` event).

  The constraints in a `ConstraintProvider` rely on problem facts for `ConstraintFactory.from(Class)`. Alternatively, scoreDRL relies on problem facts too.

  Do not annotate `planning entities` as problem facts: they are automatically available as facts for `ConstraintFactory.from(Class)` or DRL.

  See Also:
    `ProblemFactProperty`

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