A DESCRIPTION OF THE PROBLEM :
If I Open a new Stage with a SwingNode and close it. The SwingNode stays in the Heap but it isn't reachable anymore.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open a new Window with the Button
Close the Window with X

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The SwingNode is not reachable anymore and should be disposed
ACTUAL -
The SwingNode stays in the heap and is never disposed

---------- BEGIN SOURCE ----------
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.SwingUtilities;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.embed.swing.SwingNode;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 */
public class JFXDemo extends Application {

Stage stage;

/**
* @param args
*/
public static void main( final String[] args ) {
launch( args );
}

@SuppressWarnings("restriction")
@Override
public void start( final Stage stage ) {
final SwingNode swingNode = new SwingNode();

createSwingContent( swingNode );

final StackPane pane = new StackPane();
pane.getChildren().add( swingNode );

stage.setTitle( "Swing in JavaFX" );
stage.setScene( new Scene( pane, 250, 150 ) );
stage.show();
}

private void createSwingContent( final SwingNode swingNode ) {
SwingUtilities.invokeLater( new Runnable() {
@Override
public void run() {
final JButton button = new JButton( "Click" );
button.addActionListener( new ActionListener() {

@Override
public void actionPerformed( final ActionEvent e ) {

final SwingNode swingNode = new SwingNode();

createSwingContent( swingNode );

final StackPane pane = new StackPane();
pane.getChildren().add( swingNode );
Platform.runLater( () -> {
new Runnable() {
@Override
public void run() {
Stage myStage;
myStage = new Stage();
myStage.setTitle( "Swing in JavaFX" );
myStage.setScene( new Scene( pane, 250, 150 ) );
myStage.show();

}
}.run();
} );

}
} );
swingNode.setContent( button );

}
} );
}
}
---------- END SOURCE ----------

FREQUENCY : always