Swing(jFrame) can not initialize

updating to 3.10 beta does not help much,

now, the setting jFrame works but following code still does not run, (better than before when nothing worked)

JFrame f = new JFrame(“Test”); // ← this works now System.out.println(“1”); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ← hangs

its pretty wierd