AWTUtilities.setWindowOpaque(frame, false)透明化窗体后，右键菜单无法显示

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AWTUtilities.setWindowOpaque(frame, false)透明化窗体后，右键菜单无法显示5

右键菜单仅显示背景，无文字（图1），鼠标经过以后就能显示出来了（图2）

图1

图2

另外使用截图工具（飞Q自带的）的时候程序界面会消失，请问如何解决


import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.nimbus.NimbusLookAndFeel;

import com.sun.awt.AWTUtilities;

public class Test {

	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				try {
					UIManager.setLookAndFeel(NimbusLookAndFeel.class
							.getCanonicalName());
				} catch (Exception e) {
				}
				final JFrame frame = new JFrame();
				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				frame.setSize(256, 256);
				Toolkit toolkit = Toolkit.getDefaultToolkit();
				Dimension screenSize = toolkit.getScreenSize();
				frame.setLocation((int) screenSize.getWidth() - 256,
						(int) screenSize.getHeight() - 256 - 30);
				frame.setAlwaysOnTop(true);

				frame.setUndecorated(true);
				AWTUtilities.setWindowOpaque(frame, false);
				frame.setContentPane(getContentPane());
				frame.setVisible(true);
			}
		});
	}

	private static JPopupMenu getPopupMenu() {
		JPopupMenu popup = new JPopupMenu();
		popup.add(new AbstractAction("退出") {
			private static final long serialVersionUID = -4198075797720348164L;

			@Override
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
		return popup;
	}

	private static JPanel getContentPane() {
		JPanel pane = new JPanel() {
			private static final long serialVersionUID = 1757134896767627687L;

			@Override
			protected void paintComponent(Graphics g) {
				try {
					Image img = ImageIO.read(getClass().getResource("256.png"));
					g.drawImage(img, 0, 0, this);
				} catch (IOException e) {
				}
				// super.paintComponent(g);
			}
		};
		pane.setComponentPopupMenu(getPopupMenu());
		return pane;
	}
}

Swing