jdk-24/jdk/test/java/awt/Window/WindowsLeak/WindowsLeak.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8013563
 * @summary Tests that windows are removed from windows list
 * @modules java.desktop/sun.awt
 * @run main/othervm -Xms32M -Xmx32M WindowsLeak
*/

import java.awt.*;
import sun.awt.AppContext;

import java.lang.ref.WeakReference;

import java.util.Vector;

public class WindowsLeak {

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++)
        {
            Frame f = new Frame();
            f.pack();
            f.dispose();
        }

        Vector garbage = new Vector();
        while (true)
        {
            try
            {
                garbage.add(new byte[1000]);
            }
            catch (OutOfMemoryError e)
            {
                break;
            }
        }
        garbage = null;

        Vector<WeakReference<Window>> windowList =
                        (Vector<WeakReference<Window>>) AppContext.getAppContext().get(Window.class);

        if (windowList != null && !windowList.isEmpty()) {
            throw new RuntimeException("Test FAILED: Window list is not empty: " + windowList.size());
        }

        System.out.println("Test PASSED");
    }
}