HTTP download stops without any reason.

Question

Hi,
I wrote the following code to download different parts of the same URL in different threads. The object manager is a custom class which manages the various threads in each download.
public void run() {
          try {
               byte [] buffer = new byte[1024];
               URLConnection conn;
               if(proxyAddr != null)
                    conn = src.openConnection(new Proxy(Proxy.Type.HTTP, proxyAddr));
               else
                    conn = src.openConnection();
               conn.setRequestProperty("Range", "bytes=" + (start + completed) + "-" + end);
               int response = ((HttpURLConnection)conn).getResponseCode();
               if(response != 200 && response != 206)
                    manager.failConnection();
               BufferedInputStream bin = new BufferedInputStream(conn.getInputStream());
               byte [] data = new byte[1024];
               int readLen;
               manager.addConnected();
               if(start == 0) {
                    System.out.println("Jing: " + end);
                    conn.setReadTimeout(5000);
                    System.out.println(conn.getReadTimeout());
               int cnt = 0;
               while((readLen = bin.read(data)) != -1
                     && canContinue) {
                    synchronized(dest) {
                         dest.seek(start+completed);
                         dest.write(data, 0, readLen);
                    synchronized(this) {
                         completed += readLen;
                         if(start == 0) {
                              System.out.println("hi" + cnt++);
                              System.out.println(completed);
               if(start == 0)
                    System.out.println("Read: " + readLen + "\t" + start + "\t" + end);
               manager.addFinished();
               bin.close();
          } catch(IOException e) {
               manager.failConnection();
               e.printStackTrace();
     }For some URLs, the thread which downloads the first part of the file begins the download and runs along with other threads but at some unpredictable point waits to read data infinitely, in spite of the fact that I've set the timeout to 5 secs. But, the other threads which download remaining parts of the file finish their downloads successfully.

Answer 1

I've set the timeout before opening the InputStream.
The download still stops at random places. However, by catching the SocketTimeoutException, I'm able to re-establish the connection and download the remaining content.
Thanx for ur help