Description Ken Keefe 2011-03-31 15:33:36 EDT

Build Identifier: M20110210-1200

I'm using Ubuntu 10.04 64-bit. I've tested my application on Windows and OSX and it is not experiencing a similar problem.

I'm developing an RCP application that uses SWING components (for legacy reasons). I just recently came across this problem, but I'm not sure if it is new. When I set the look and feel for SWING using: 

try {
	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
	System.out.println(e);
}

And run my application, it behaves normally. But when I click the X button in the corner of my main window, the application just freezes. I can't seem to get any sort of debugging information on this error, it just freezes until the window manager asks if it should be killed.

Also, if I set the look and feel to something other than the GTK one (for example, motif), this problem does not occur. Only when the GTK LaF is used.

Finally, I tried to see if I could reproduce this problem using only SWT with the following code and the problem did NOT occur. I was able to reproduce the problem in a simple test case that I describe in the Steps to Reproduce.

import javax.swing.UIManager;

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Main {
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Exception e) {
			System.out.println(e);
		}
		Display display = new Display();
		Shell shell = new Shell(display);

		shell.setText("Hello, world!");

		shell.open();

		// Set up the event loop.
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				// If no more entries in event queue
				display.sleep();
			}
		}

		display.dispose();
	}
}




Reproducible: Always

Steps to Reproduce:
1. Create a new RCP application and use the Hello World template.
2. Do either 2a OR 2b.
2a. Add this code to the beginning of the Application.start method:
try {
	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
	System.out.println(e);
}
// Template code below...
	Display display....
2b. In the run configuration, add this to the VM Arguments: -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel
3. Run the Hello World application.
4. Click the X button in the corner of the window and it should be frozen now.