Release Java file lock in Windows

Question

I'm having some problems deleting a file in Windows with java. For some reason, java is keeping a lock on my file, and I don't know why. Here is my code:

private byte[] getFileByteArray(File file) {
    try {
        RandomAccessFile raf = new RandomAccessFile(file, "r");
        FileChannel channel = raf.getChannel();
        try {

            ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
            byte[] bt = new byte[buffer.remaining()];
            buffer.get(bt);
            channel.close();
            raf.close();
            file.delete();
            return bt;

        } catch (Exception ex) {
            //Logger.getLogger(ConnectionImpl.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println(ex.toString());
        }

    } catch (FileNotFoundException ex) {
        Logger.getLogger(ConnectionImpl.class.getName()).log(Level.SEVERE, null, ex);
    }
    return null;
}

file.delete(), as well as trying manually in Explorer refuses to delete the file as it's still in use. All seems well in Linux though.

Am I missing a close() somehwhere? I can confirm that the method which makes the file in the first place is closing the file, as I can delete the file before running the above code using file.delete()

Extra Info: The code above is part of a method called getFileByteArray(File file) and is being called like this:

public byte[] createReport(int id) {

    Report report = new Report();
    String filename = report.CreateReport(id);
    return getFileByteArray(new File(filename));
}

Thanks

Update: I managed to fix the issue by reading the file kilobyte by kilobyte into the byte array using ByteArrayOutputStream

As a poster below mentioned, there is a known bug in Java in that Windows has issues with file mapping.