Java SE (Java Platform, Standard Edition)

import java.awt.Color;

import javax.swing.*;
import javax.swing.event.*;


/**
* This class bring up a new JFrame whose ContentPane contains
* a new JPanel which contains
* a new JLabel and a new JTextArea.
* <p>
* The JFrame's content pane's background is set to red, and the JPanel's background is set to green,
* so that you can visually see everywhere each extends.
* (As expected, the JPanel fills the entirety of the inside of the JFRame.)
* <p>
* Dedicated JPopupMenu instances are assigned to all of the JFrame's panes (content, glass, layered, and root)
* as well as the JPanel.
* The JLabel and JTextArea are assigned to inherit their PopupMenu,
* which here means that they will use the JPanel's PopupMenu.
* <p>
* The popup menus all contain just a single item whoch does nothing except state the source of the popup event.
* A given popup menu instance also has an associated PopupMenuListener which prints events to System.out,
* identifying the event source in the process,
* so that if it was generated but was somehow obscured, then you can tell from looking at System.out.
* <p>
* The expected outcome of running this class is that you should be able to mouse right click
* (this assumes Windoze is the OS) anywhere inside the JFrame and a popup menu should appear.
* More specifically, that popup menu should always have a single item labeled "Event from JPanel"
* because the JPanel fills up all the inside of the JFrame
* and all of its children inherit their popup menu from it.
* <p>
* What happens in reality is different:
* if you right click directly over the JTextArea, the expected popup menu appears,
* but if you right click over anywhere else (e.g. directly over the JLabel), nothing appears.
* <p>
* What must be happening is that some other component is first receiving many of the mouse events and consuming them.
* <p>
* @author Brent Boyer
* @see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4465870">A possibly related bug report</a>
*/
public class PopupMenuBug {
	
 
	public static void main(String[] args) throws Exception {
		buildGui();
	}
	
 
	private static void buildGui() {
		JFrame frame = new JFrame();
		frame.setSize(600, 500);
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.getContentPane().setBackground( Color.RED );
		
		((JComponent) frame.getContentPane()).setComponentPopupMenu( new PopupMenuLabeled("Event from ContentPane") );
		((JComponent) frame.getGlassPane()).setComponentPopupMenu( new PopupMenuLabeled("Event from GlassPane") );		
		frame.getLayeredPane().setComponentPopupMenu( new PopupMenuLabeled("Event from LayeredPane") );
		frame.getRootPane().setComponentPopupMenu( new PopupMenuLabeled("Event from RootPane") );
		
		frame.getContentPane().add( buildItems() );

		frame.setVisible(true);
	}
	
 
	private static JComponent buildItems() {
		JPanel jpanel = new JPanel();
		jpanel.setBackground( Color.GREEN );
		jpanel.setComponentPopupMenu( new PopupMenuLabeled("Event from JPanel") );
				
		jpanel.add( buildItem1() );
		jpanel.add( Box.createHorizontalStrut(20) );
		jpanel.add( buildItem2() );
		
		return jpanel;
	}
	
 
	private static JComponent buildItem1() {
		JLabel label = new JLabel("Label");
		label.setInheritsPopupMenu(true);
		return label;
	}
	
 
	private static JComponent buildItem2() {
		JTextArea textArea = new JTextArea("JTextArea", 20, 20);
		textArea.setInheritsPopupMenu(true);
		return textArea;
	}
	
	
	private static class PopupMenuLabeled extends JPopupMenu {
		private static final long serialVersionUID = 1;
		
		private PopupMenuLabeled(final String label) {
			add( new JMenuItem( label ) );
			
			addPopupMenuListener( new PopupMenuListener() {
				public void popupMenuWillBecomeVisible(PopupMenuEvent e) { System.out.println( label + ": popupMenuWillBecomeVisible" ); }
				public void popupMenuWillBecomeInvisible(PopupMenuEvent e) { System.out.println( label + ": popupMenuWillBecomeInvisible" + "\n" ); }
				public void popupMenuCanceled(PopupMenuEvent e) { System.out.println( label + ": popupMenuCanceled" ); }
			} ); 
		}
	}


}