For those who don't want to litter their Entities or Solution classes with the value provider logic, we 'd support something like this:

public class MyFactory {

  @ValueRangeProvider(id = "myValueRange")
  public Collection<MyValue> getValues(...) {

  }

}

Of course, OptaPlanner will need to know about this, so it will need something like this in the solver config xml:

<solver>
  <solutionClass>...</>
  ...
  <valueRangeProviderClass>...MyFactory</valueRangeProviderClass>
  ...
</solver>