test/jdk/java/beans/XMLEncoder/Test4646747.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * published by the Free Software Foundation.
 *
 * 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,
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/*
 * @test
 * @bug 4646747
 * @summary Tests that persistence delegate is correct after memory stress
 * @author Mark Davidson
 * @run main/othervm -ms16m -mx16m Test4646747
 */

import java.beans.DefaultPersistenceDelegate;
import java.beans.PersistenceDelegate;
import java.beans.XMLEncoder;

/**
 * This bug was introduced in 1.4 FCS but was working in 1.4.beta3
 */
public class Test4646747 {
    public static void main(String[] args) {
        XMLEncoder encoder = new XMLEncoder(System.out);
        encoder.setPersistenceDelegate(Test4646747.class, new MyPersistenceDelegate());
        // WARNING: This can eat up a lot of memory
        Object[] obs = new Object[10000];
        while (obs != null) {
            try {
                obs = new Object[obs.length + obs.length / 3];
            }
            catch (OutOfMemoryError error) {
                obs = null;
            }
        }
        PersistenceDelegate pd = encoder.getPersistenceDelegate(Test4646747.class);
        if (!(pd instanceof MyPersistenceDelegate))
            throw new Error("persistence delegate has been lost");
    }

    private static class MyPersistenceDelegate extends DefaultPersistenceDelegate {
    }
}