Strange problem with RandomAcess FIle stream !!!!

Question

In our on going project we have a requirement of locking the files and do some processing on it.
TO achieve this we used new features of JDK 1.4 and attained the locks. We are working on xml files and at present its size is around 390KB. After doing all activity when we try to write the file back to filesystem using 'RandomAccessFile' it does not write the full file. Next time it starts generating parsing errors.
Due to this we are stuck up and donot know why this is happening. We tried doing the same with 'FileOutput'stream and it works fine. But our requirement is to do all the activity with RandomAccess only.
Any help on the above will be highly appreciated.
THanks in advance
Arvind

Answer 1

Below given is how I am reading the file
raf = new RandomAccessFile("xfiles/lkups/analyser1.xml", "rws");
     if(raf!=null)
     channel = raf.getChannel();
     lock = channel.lock(); //Lock the file
     System.out.println("Got Lock !!");
After doing the required processing on the file, the complete xml file resides in 'buffer' (stringBuffer). This is how I am writing it to the stream. (The same stuff works fine with FileOutputStream)
raf.seek(0);
ByteBuffer bBuff=ByteBuffer.wrap(buffer.toString().getBytes());
channel.write(bBuff);
channel.close();
System.out.println(" read channel closed");
raf.close();
After lot of debugging this had been found that the problem is arising at the time of writing the file. The buffer contains the right parsable xml file.