NullPointer when accessing FXML annotated object

Hello

I had a strange behavior (!) using an annotated object FXML...

Consider the following:

You have a soft with build FXML UI.

There is a button named connectB which is annotated @FXML...

In the initialize method of my application, I have disable this button.

After the start of my application, I want to connect to a database...

Therefore, I use a task < void >

I put everything together in one class (the main application class)

Here's the code...

public class MainApp extends Application implements Initializable{

// ... several other objects
@FXML
  private Button connectB;

@Override
 public void initialize( URL location, ResourceBundle resources ) {

 connectB.setDisable( true );
  // ...
}

@Override
 public void start( final Stage stage ) throws Exception {
 

 // setup the fxml loader
 final FXMLLoader guiLoader = new FXMLLoader( getClass().getResource( "/fxml/Scene.fxml" ) );
 // load the root node
 rootNode = guiLoader.load();

 Scene scene = new Scene( rootNode );
 scene.getStylesheets().add( "/styles/Styles.css" );

 stage.setTitle( "Test" );
 stage.setScene( scene );
 stage.show();
    
          // start the task async via an ExecutorService
 es.sumbit( new DBSetupTask() );
 }

// the db connection task class
private final class DBSetupTask extends Task<Void> {

 @Override
 protected Void call() throws Exception {

 try {
 // connecto to DB
 PersistenceManager.initSessionFactory();

 }
 catch ( final ExceptionInInitializerError eiiE ) {
 mainAppLogger.error( "Failed to connect to DB!", eiiE );

 }
 return null;
 }

 @Override
 protected void failed() {
 super.failed();
 connectB.setDisable( true );
 }

 @Override
 protected void cancelled() {
 super.cancelled();
 }

 @Override
 protected void succeeded() {
 super.succeeded();
 connectB.setDisable( false );

 }

 @Override
 protected void running() {
 super.running();
}

 }

}

The connectB is not null in the initialize method, but later in the task class

Someone knows why?

Kind regards

Olek

I put everything together in one class (the main application class)

Do not do this. Your application is not your controller.

Here's what happens:

The FXMLoader analyzes your FXML file. When it encounters the attribute fx:controller (which I assume that you have set to "MainApp"), it creates a new instance of the specified class. Once the object hierarchy specified in the FXML file is assembled, injects values in the controller instance, he created and then calls initialize() on this object.

If you find yourself with two instances of the MainApp class; one in which the start (...) method is called and the other in which the initialize (...) method is called. The values of injection (connectB) are initialized only in the second case.

To resolve this problem, set a controller class regardless of your application class:

public class MyController {
    @FXML
    private Button connectB ;
    public void initialize() {
        // ...
    }
    public void setupDB() {
        es.submit(new DBSetupTask());
    }

    private final class DBSetupTask extends Task { ... }
}

and then call the appropriate method of your start method (...):

public class MainApp extends Application {
   @Override
   public void start(Stage stage) {
       final FXMLLoader guiLoader = new FXMLLoader(getClass().getResource("/fxml/Scene.fxml"));
       rootNode = guiLoader.load();
       Scene scene = new Scene(rootNode);
       scene.getStylesheets().add("/styles/Styles.css");
       stage.setTitle("Test");
       stage.setScene(scene);
       stage.show();

       MyController controller = (MyController)guiLoader.getController();
       controller.setupDB();
   }
}

Tags: Java

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