Name: gsC80088 Date: 02/15/99


First, compile this class:

import javax.swing.*;

public class DebugCrash extends JFrame
{
    
    public DebugCrash()
    {
String[] list = {"Foo", "bar"};
getContentPane().add(new JComboBox(list));
pack();
    }

    public static void main(String[] args)
    {
JFrame f = new DebugCrash();
f.setVisible(true);
    }

}

Then start the debugger (i.e. type jdb DebugCrash).

Here is my transcript of a debug session. Note that I set a breakpoint
on the setVisible method of javax.swing.JPopupMenu and when the debugger
tries to step past that code it crashes.

H:\robert\java\src>jdb DebugCrash
Initializing jdb...
0xae:class(DebugCrash)
> use d:\java\jdk1.2\src
> stop in javax.swing.JPopupMenu.setVisible
Breakpoint set in javax.swing.JPopupMenu.setVisible
> run
run DebugCrash
running ...
main[1]
Current thread "main" died. Execution continuing...
>
Breakpoint hit: javax.swing.JPopupMenu.setVisible (JPopupMenu:726)
AWT-EventQueue-0[1] list
722 * description: Makes the popup visible
723 */
724 public void setVisible(boolean b) {
725 // Is it a no-op?
726 => if (b == isVisible())
727 return;
728
729 // if closing, first close all Submenus
730 if (b == false) {
AWT-EventQueue-0[1] next
java.lang.InternalError: unknown JVMDI errorAWT-EventQueue-0[1]
        at sun.tools.agent.CachedMethod.getCode(Native Method)
        at sun.tools.agent.CachedMethod.fetchCode(CachedMethod.java:102)
        at sun.tools.agent.CachedMethod.byteAt(CachedMethod.java:165)
        at sun.tools.agent.StepHandler.stepLine(StepHandler.java:749)
        at sun.tools.agent.StepHandler.run(StepHandler.java:156)
(Review ID: 53608)
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