CODEWITHSUNDEEP
javajavafx
drewpol
drewpol

Reputation: 697

Send class object to stage controller - javafx

I have a class FontInfo and i try to send its object myFont to new controller of stage which appear when i click button. Here is my main controller class:

public class MainController {

//create instance of font
private FontInfo myFont;

@FXML
private Button btnChooseFont;

public void initialize()
{
    //create new myFont
    myFont = new FontInfo();
}

@FXML
void actionBtnChooseFont(ActionEvent event) {

    try
    {
        //resource to new parent root
        Parent root = FXMLLoader.load(getClass().getResource("../fxml/ChooseFont.fxml"));
        Stage stage = new Stage();
        stage.setTitle("Choose font");
        stage.setScene(new Scene(root, 300, 290));
        stage.show();

        FXMLLoader loader = new FXMLLoader(this.getClass().getResource("../fxml/ChooseFont.fxml"));
        ChooseFontController chooseFontController = loader.getController();
        chooseFontController.setMyFont(myFont);
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }

}

}

I need to use myFont object which I create in MainConroller in ChooseFontController class :

public class ChooseFontController {

//myFont object
private FontInfo myFont;

//setter myFont
public void setMyFont(FontInfo myFont) {
    this.myFont = myFont;
}

But i get null pointer exception error :

Caused by: java.lang.NullPointerException
at controllers.MainController.actionBtnChooseFont(MainController.java:48)

in :chooseFontController.setMyFont(myFont);

Can anyone help me with this issue ?

Upvotes: 1

Views: 346

Answers (2)

n247s
n247s

Reputation: 1918

It seems like the FXMLLoader couldn't find a Controller, and therefore returns null from the loader.getController(). Maybe calling loader.load() helps finding it... e.g.

  FXMLLoader loader = new FXMLLoader(this.getClass().getResource("../fxml/ChooseFont.fxml"));
  Loader.load();
  ChooseFontController chooseFontController = loader.getController();
  chooseFontController.setMyFont(myFont);

(Ps. Debugging helps a lot in these cases to find the exact problem)

Upvotes: 1

GOXR3PLUS
GOXR3PLUS

Reputation: 7255

Modify initialize method:

@FXML
public void initialize()
{
    //create new myFont
    myFont = new FontInfo();
}

Actually the problem is that you never load the ChooseFont.fxml document so you have to edit your code to load the fxml document:

FXMLLoader loader = new FXMLLoader(this.getClass().getResource("../fxml/ChooseFont.fxml"));
try{
  loader.load();
}catch(Exception ex){
 ex.printStackTrace();
}
ChooseFontController chooseFontController = loader.getController();

Also keep in mind that here you are using a static constructor

 Parent root = FXMLLoader.load(getClass().getResource("../fxml/ChooseFont.fxml"));

Upvotes: 1

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