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Java, FX data validation with complex interdependency
class Product{
  StringProperty prop1;
  StringProperty prop2;
  .........
}

class Controller{
   GridPane pane;
   Product _product;
   init(){};
   ObservableList readXMLBuildOptionsList(){
     //build options from xml
     return optionlist;
   }
   buildGui(){
      pane = new GridPane();
      Rules rule = new Rules();
      //For each optionList in master list
      //Create combo that matches up to properties of object
      ComboBox box = new ComboBox(observableList);
      box.addChangeListener(new ChangeListener(){

            @Override
            public void changed(ObservableValue arg0, Object arg1, Object arg2) {
                if (arg1 != arg2) {
                    rule.validate(arg0, arg1, arg2);
                }
            }
        });
   }
}

class Rules{
   void validate(ObservableValue arg0, Object arg1, Object arg2){
      //some validation across all fields?
      //Change invalid options in other fields to red colored text
    }
}