test/jdk/java/nio/channels/FileChannel/MapReadOnly.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 4510489
 * @summary Verify IOUtil.java reads to buffer limits
 * @run main/othervm MapReadOnly
 */
import java.io.*;
import java.nio.*;
import java.nio.channels.*;

public class MapReadOnly {
    public static void main (String args[]) throws Exception {
        File testFile = File.createTempFile("test2", null);
        testFile.deleteOnExit();
        RandomAccessFile raf = new RandomAccessFile(testFile, "rw");
        FileChannel fc = raf.getChannel();
        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0L,
                                      (int) fc.size());
        mbb.load();
        try {
            mbb.put((byte)3);
            throw new Exception("Test failed");
        } catch (ReadOnlyBufferException robe) {
            // Correct result
        }
        fc.close();
        raf.close();
    }
}