JavaFX Error: Controller value already specified

Question

I\'m trying to open a new form window. But I want to assign some values in the constructor.

The codes I tried:

fxmlLoader.setRoot(null);

Answer 1

Remove the fx:controller attribute from the FXML file. That attribute is an instruction to the FXMLLoader to create a new controller: since you have already set one by calling setController it is contradictory.