Java APIs

Hi guys

I'm working on a simple app that sends multiple files over LAN or I-NET. The problem is that the app run seems to be non-deterministic. I keep getting this error on the client side:

java.io.UTFDataFormatException: malformed input around byte 5
        at java.io.DataInputStream.readUTF(Unknown Source)
        at java.io.DataInputStream.readUTF(Unknown Source)
        at service.DownloadManager.storeRawStream(DownloadManager.java:116)
        at service.DownloadManager.downloadFiles(DownloadManager.java:47)
        at manager.NetworkTransferClient$1.run(NetworkTransferClient.java:104)

The byte position changes every time I run a transfer. The error is caused by this line: String fileName = in.readUTF(); Here's the complete code:

Client

private void storeRawStream() {                                
        try {
            FileOutputStream fileOut;                        
            
            int fileCount = in.readInt();            
            for(int i=0; i<fileCount; i++) {  
                byte data[] = new byte[BUFFER];
                
                String fileName = in.readUTF();                
                
                fileOut = new FileOutputStream(new File(upload, fileName));  
                long fileLength = in.readLong();                                  
                for(int j=0; j<fileLength / BUFFER; j++) {
                    int totalCount = 0;
                    
                    while(totalCount < BUFFER) {                        
                        int count = in.read(data, totalCount, BUFFER - totalCount);
                        totalCount += count;                  
                    }
                    
                    fileOut.write(data, 0, totalCount);
                    fileOut.flush();
                    
                    bytesRecieved += totalCount;                                   
                }
                
                // read the remaining bytes                
                int count = in.read(data, 0, (int) (fileLength % BUFFER));                                         
                fileOut.write(data, 0, count);               
                
                fileOut.flush();
                fileOut.close();       
                
                transferLog.append("File " + fileName + " recieved successfully.\n");   
            }  

        } catch (Exception ex) {
            ex.printStackTrace();
        }
        
    }

Server

public void sendFiles(File[] files) throws Exception {
        byte data[] = new byte[BUFFER];
        
        FileInputStream fileInput;                                        
        out.writeInt(files.length);               

        for (int i=0; i<files.length; i++) {    
            // send the file name
            out.writeUTF(files.getName());

// send the file length

out.writeLong(files[i].length());



fileInput = new FileInputStream(files[i]);



int count;

while((count = fileInput.read(data, 0, BUFFER)) != -1) {

out.write(data, 0, count); 

bytesSent += count; 

} 



fileInput.close(); 

}



out.flush(); 

}
Does anybody know where's the problem? Thanx for any reply.