When using JDK 7u12 b1 (on Mac OS X), my existing application (game) broke.
I noticed that holding down a key (something I use for character movement) generates an infinite amount of pressed/typed/released events, even though the key is being held down and is never released.

This did not happen with JDK 7u10 b15 or JDK 7u9.

Test case:

public class KeyDownTest extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        root.setFocusTraversable(true);
        root.addEventHandler(KeyEvent.ANY, new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent t) {
                System.out.println(t.getEventType() + " " + t.getCode());
            }
        });
        
        Scene scene = new Scene(root, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}