javafx exception : Controller value already specified

Question

I'm calling a method to load a window by passing some parameters to a specific internal method of this window, but I've got this exception:

GRAVE: null
javafx.fxml.LoadException: Controller value already specified.
unknown path:12

here is my method

public void openDef(String sys, String comp, String code) throws Exception {
    Stage defStage = new Stage();
    FXMLLoader loader = new FXMLLoader();
    DefTableController cont = new DefTableController();//calling class controller
    loader.setController(cont);
    Parent frame = loader.load(getClass().getResource("defTable.fxml").openStream());
    cont.getSysChoice(sys, comp, code);//call the method by passing parameters
    Scene sceneDef = new Scene(frame);

    defStage.setTitle("Défaillance du " + comp);
    defStage.setScene(sceneDef);
    defStage.show();
}

I don't understand why it consider that the controller is already set? and how to fix that ? thank you

It is probable that you have defined your controller in your Fxml also ! — Bo Halim
– Bo Halim, Commented Jan 3, 2017 at 16:01
you were right,, thank you, but it doesn't pass the parameters, I receive nothing — devhicham
– devhicham, Commented Jan 3, 2017 at 16:04
Aside: if your FXML is in a file/resource (which it almost always will be). don't call the load(...) method specifying a stream. If you do this, the FXMLLoader will not have any information about the location, and will not be able to perform location resolution. Instead, specify the location in the constructor: FXMLLoader loader = new FXMLLoader(getClass().getResource("defTable.fxml")); and then call the no-arg load() method: Parent frame = loader.load();. — James_D
– James_D, Commented Jan 3, 2017 at 16:12

user3810840 · Accepted Answer · 2017-05-29 13:17:55Z

14

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.

JavaFX Error: Controller value already specified

This guy answered it ^ Props to him!

answered May 29, 2017 at 13:17

user3810840

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