public void testInitOutsideOfEDT() throws Exception {
    class MyToolbar extends Toolbar implements Runnable {

        @Override
        protected void setUI(ComponentUI newUI) {
            assertTrue("Can only be called in EDT", EventQueue.isDispatchThread());
            super.setUI(newUI);
        }

        @Override
        public void setUI(ToolBarUI ui) {
            assertTrue("Can only be called in EDT", EventQueue.isDispatchThread());
            super.setUI(ui);
        }

        private void assertUI() throws Exception {
            EventQueue.invokeAndWait(this);
        }

        @Override
        public void run() {
            assertNotNull("UI delegate is specified", getUI());
        }
    }
    
    assertFalse("We are not in EDT", EventQueue.isDispatchThread());
    MyToolbar mt = new MyToolbar();
    assertNotNull("Instance created", mt);
    
    mt.assertUI();
}
 

public void testInitOutsideOfEDT() throws Exception {
    class MyToolbar extends ToolbarWithOverflow implements Runnable {

        @Override
        protected void setUI(ComponentUI newUI) {
            assertTrue("Can only be called in EDT", EventQueue.isDispatchThread());
            super.setUI(newUI);
        }

        @Override
        public void setUI(ToolBarUI ui) {
            assertTrue("Can only be called in EDT", EventQueue.isDispatchThread());
            super.setUI(ui);
        }

        private void assertUI() throws Exception {
            EventQueue.invokeAndWait(this);
        }

        @Override
        public void run() {
            assertNotNull("UI delegate is specified", getUI());
        }
    }

    assertFalse("We are not in EDT", EventQueue.isDispatchThread());
    MyToolbar mt = new MyToolbar();
    assertNotNull("Instance created", mt);

    mt.assertUI();
}
 

public @Override void setUI(ToolBarUI ui){
    addListener = false;
    super.setUI(ui);
    addListener = true;
}