All platforms: Loose previous menu bar when you replace it with new menu bar. It
looks like the garbage collection is a little too agressive?

Steps to reproduce
Compile and run the attached code
Select File | New
// the menu bar should change
Select Edit | Copy
// the menu bar should change back to File
Select File
// Note: the menu has disappeared

/* Tests changing a menu bar */

import java.awt.*;

class ChangeMenu extends AppFrame
{
    private MenuBar fileMenu;
    private MenuBar editMenu;

    public ChangeMenu(String name)
    {
       super(name);
    
       // set new MenuBar
       fileMenu = new MenuBar();
       fileMenu.add(new FileMenu("File"));
       setMenuBar(fileMenu);

       editMenu = new MenuBar();
       editMenu.add( new EditMenu("Edit") );

       resize(200, 200);

    }
    

    public boolean menuEvent(Event evt, Object obj)
    {

       String label = (String) obj;
       if (label.equals("New") )
       {
          remove(fileMenu);
          setMenuBar(editMenu);
          return true;
       }
       else if (label.equals("Copy") )
       {
          remove(editMenu);
          setMenuBar(fileMenu);
          return true;
       }
       else
          return super.menuEvent(evt, obj);
    }


    public static void main(String args[])
    {
       ChangeMenu x = new ChangeMenu("Change Menu Test");
       x.show();
    }
}



/* Main Menu bar
 *
 */

import java.awt.MenuItem;
import java.awt.Menu;

public class FileMenu extends Menu
{
    // standard menu item labels
    public final String EXIT = "Exit";
    public final String NEW = "New";
    public final String OPEN = "Open";


    public FileMenu(String menuName)
    {
       super(menuName);
       add(new MenuItem(NEW));
       add(new MenuItem(OPEN));
       addSeparator();
       add(new MenuItem(EXIT));

    }

}

class EditMenu extends Menu
{
    public final String COPY = "Copy";
    
    public EditMenu(String menuName)
    {
       super(menuName);
       add(new MenuItem(COPY) );
       addSeparator();
    }
}
/* Generic Full Application Frame
 * %W% %G% %U%
 * @author Kevin A. Smith
 *
 * The class AppFrame provides an AWT Frame window for running
 * applications.
 *
 */

import java.awt.Frame;
import java.awt.Event;
import java.awt.MenuItem;

// Application Frame window
class AppFrame extends Frame
{
    // constructor needed to pass window title to class Frame
/* public AppFrame()
    {
       super("Untitled");
    }

 */
    public AppFrame(String name)
    {
       // call java.awt.Frame(String) constructor
       super(name);
    }

    // needed to allow window close
    public boolean handleEvent(Event e)
    {
       // Window Destroy event
       if (e.id == Event.WINDOW_DESTROY)
          return appExit(0);
       
       // it's good form to let the super class look at any
       // unhandled events
       return super.handleEvent(e);

    } // end handleEvent()

    // Generic Action event handler
    public boolean action(Event evt, Object obj)
    {
       if(evt.target instanceof MenuItem)
          return menuEvent(evt, obj);
       else
          // it is good form to let the super class look at any
          // unhandled events.
          return super.action(evt, obj);

    } // end action()

    // Generic Menu event handler
    public boolean menuEvent(Event evt, Object obj)
    {
       String menuLabel = obj.toString();

       if( menuLabel.equals("Exit") )
       {
          // This menu item is the same as Close
          return appExit(0);
       }

       else
          // menu event handler did nothing with this event.
          // In a fully written application, you should never
          // get to this line.
          return false;

    } // end menuEvent()

    protected boolean appExit(int exitCode)
    {
       System.exit(exitCode);
       return true;
    }
} // end class AppFrame

The description field as copied from bug report 1227968 follows:

95/11/12
This bug was originated by Bob Jervis. The bug has been sent to Sami Shaio.

[Bob Jervis]
We are getting a SIGBUS error consistently when we load our debugger page
    and then switch to another page.
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