MappedByteBuffer and UTF-8

ykon <>
Tue, 26 Aug 2008 16:22:28 -0700 (PDT)
Hello java ppl,

For some hours now I am experimenting with MappedByteBuffer, and I
have the following issue:
Firstly I write 10 integers, followed by a String encoded in UTF-8.
Next when I try to read it back, but the String is garbage formated.
Here is the (messy)code:

public class MemoryMappingRW {

    MappedByteBuffer mbb;

    public MemoryMappingRW(String fileName) throws, {
        File myFile = new File(fileName);
        if (myFile.exists()) {
        mbb = new RandomAccessFile(myFile, "rw").getChannel().map(
                FileChannel.MapMode.READ_WRITE, 0, 0x8FFFFFF);

    public static void main(String[] args) throws Exception {

        MemoryMappingRW mm = new MemoryMappingRW("test.dat");
        for (int i = 0; i < 10; i++) {

        mm.mbb.put(ByteBuffer.wrap("test =E4=EF=EA=E9=EC=E7".getBytes()));
        int strLength = Charset.forName("UTF-8").encode("test


        for (int i = 0; i < 10; i++) {
            System.out.print(mm.mbb.getInt() + " ");

        char[] chArray = new char[strLength];

        String anStr = new String(chArray);
        System.out.println("\n" +


// END

I am running it on Linux and my environment is configured as follows:

Also by running "cat path_to/test.dat", I can see that the String is
encoded correctly.
Any help would be appreciated


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