test/java/nio/channels/FileChannel/Release.java

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 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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 * questions.
 */

/* @test
 * @bug 4854056
 * @summary Check release on closed channel
 */

import java.io.*;
import java.nio.channels.*;

public class Release {
    public static void main(String[] args) throws Exception {
        FileOutputStream fos = new FileOutputStream("testFile.tmp");
        fos.write(new byte[128]);
        FileChannel ch = fos.getChannel();
        FileLock fl = ch.lock();
        ch.close();
        try {
            fl.release();
            throw new RuntimeException("Expected exception not thrown");
        } catch (ClosedChannelException cce) {
            // Correct result
        }
    }
}