Java SWT app fails to render from AIX on Cygwin X

[Stephen McCants <stephenmccants at yahoo dot com>]

Hello,

    I've run into a problem with Cygwin X that I'm at a loss as to how
to debug further.  I have a trivial test case that uses Java and SWT,
and it creates a simple dialog box (source code provided below - I
found it as an example on the internet).  I have two other machines -
one is a Linux box (RHEL 4) and the other is an AIX machine (AIX 5.3).
    I start my Cygwin X server so that it displays its windows side by
side on the desktop with Windows' windows.  I then ssh with X11
tunnelling (using Putty) to the Linux and AIX boxes.  Both can send
back xterm windows without problem.  However, when I run my simple test
program, it works on Linux and fails on AIX (draws an ugly unresponsive
gray box that I can drag around the screen but not close - it doesn't
have the buttons).  If I run both the applications to display on my
Linux box, then they both work correctly, so it isn't AIX that is
failing by itself or with a Linux X server, but an AIX/Cygwin
interaction seems to be going awry.
    So, what are some of the obvious differences between AIX and Linux here:

1) Different Java binaries (they are the same Java version, so I think this is unlikely to be the problem)
2) Different graphics libraries.  Both use SWT, but on Linux SWT uses GTK.  On AIX, SWT uses Motif.

Possibly related bugs I found:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=36806

    At this point, I'm at a loss as to how to further debug the problem.  I'd appreciate any thoughts.  Thanks!

        Sincerely,
                Stephen McCants


Steps to reproduce:

0) Log into an AIX box from a Windows machine with SSH (X11 tunneling on) and Cygwin X.
1) Create a file named DialogClass.java containing:

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class DialogClass {
  static boolean deleteFlag = false;

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Dialog Example");
    shell.setSize(300, 200);
    shell.open();

    final Button button = new Button(shell, SWT.PUSH);
    button.setText("Delete File");
    button.setBounds(20, 40, 80, 25);

    final Text text = new Text(shell, SWT.SHADOW_IN);
    text.setBounds(140, 40, 100, 25);

    final Shell dialog = new Shell(shell, SWT.APPLICATION_MODAL
        | SWT.DIALOG_TRIM);
    dialog.setText("Delete File");
    dialog.setSize(250, 150);

    final Button buttonOK = new Button(dialog, SWT.PUSH);
    buttonOK.setText("OK");
    buttonOK.setBounds(20, 55, 80, 25);

    Button buttonCancel = new Button(dialog, SWT.PUSH);
    buttonCancel.setText("Cancel");
    buttonCancel.setBounds(120, 55, 80, 25);

    final Label label = new Label(dialog, SWT.NONE);
    label.setText("Delete the file?");
    label.setBounds(20, 15, 100, 20);

    Listener listener = new Listener() {
      public void handleEvent(Event event) {
        if (event.widget == buttonOK) {
          deleteFlag = true;
        } else {
          deleteFlag = false;
        }
        dialog.close();
      }
    }; 
      
    buttonOK.addListener(SWT.Selection, listener);
    buttonCancel.addListener(SWT.Selection, listener);

    Listener buttonListener = new Listener() {
      public void handleEvent(Event event) {
        dialog.open();
      }
    }; 
      
    button.addListener(SWT.Selection, buttonListener);

    while (!dialog.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    
    if (deleteFlag) {
      text.setText("File deleted.");
    } else {
      text.setText("File not deleted.");
    }
    
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

2) Set your CLASSPATH to contain the SWT jar files:

export CLASSPATH=<path to
SWT>/org.eclipse.swt_3.3.0.v3446.jar:<path to
SWT>/org.eclipse.swt.motif.aix.ppc_3.3.0.v3346.jar:.

3) Compile the program:

javac DialogClass.java

4) Run the program:

java DialogClass


      

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