URLConnection blocked

are the two connections made in one thread?  If so, then certainly one will block the other.
Can you post the relevant part of your code so we can see whats going on.

Put every connection in a separate thread which will not block the main thread, and synchronize them if you need to. Can you post sample code from your applet ?

public class Engine extends Thread
{
  private volatile boolean shutdown;
  ...
  ...

  public void run()
  {
    while (!shutdown)
    {
      String line = getTunnelLine()
      if (!shutdown) processLine(line);
    }
     
  /**
   * Opens the connection to the proxy
   */
  private URLConnection openTunnel(String file)
  {
    URLConnection result;
   
    try
    {
      URL url = new URL("http" + (applet.secure ? "s" : "") + "://" + tunnelHost + ":" + (applet.secure ? "443" : new Integer(tunnelPort).toString().trim()) + file);
      result = url.openConnection();
    }
    catch (Exception e)
    {
      System.err.println("openTunnel:" + e);
      result = null;
    }
    return result;
  }

  /**
   * Gets a line of data from the HTTP tunnel
   * This function gets the long HTML page
   * and blocks all other openTunnel request
   * from executing. It is called from the engine
   * run().
   */
  private String getTunnelLine()
  {
    String result = "";
   
    if (getLineBuffer.size() > 0)
    {
      result = (String) getLineBuffer.firstElement();
      getLineBuffer.removeElementAt(0);
    }
    else
    {      
      URLConnection conn = openTunnel("/csd/proxy.cgi?cssesstoken=" + cssesstoken + "&unum=" + uniqueNum++ + "&csconnectionstyle=sendandclose");
      if (conn != null)
      {
        conn.setAllowUserInteraction(true);
        conn.setUseCaches(false);
        conn.setDoInput(true);
        if (connectTunnel(conn))
        {
          applet.message(applet.getResourceString("r50"));
          BufferedReader br = getBufferedReader(conn);
          if (br != null)
          {
            String lines = readBufferedReader(br);
            if (lines != null)
            {
              last_io = new Date();
              result = parseLines(lines);
              if (debugIn) System.err.println("In =" + result);
            }
            else
              error = true;  
            closeBufferedReader(br);
          }
          else
            error = true;
        }
        else
          error = true;
        closeTunnel(conn);
      }
      else
        error = true;
    }
    return result;
  }


  /**
   * The tunnel outline calls the quick
   * html page.
   * Tunnel the data sent to the server
   * so it looks like an HTTP POST request.  This
   * function is called when the user clicks buttons
   * on the applet to send data back to the server
   * however. It cant get bufferedreader after a while
   * because getTunnelLine is also blocking on get
   * buffered reader
   */
  public void tunnelOutline(String data)
  {
    PrintWriter out = null;
    BufferedReader in = null;
    boolean success;

    String postData = "cssesstoken=" + cssesstoken + "&" + "cschatinput=" + encode(data) + "&" + "csconnectionstyle=sendonly\r\n";
    if (useProxy)
    {
      URLConnection conn = openTunnel("/CSJava/CSCPROXY.CGI?cssesstoken=" + cssesstoken + "&cschatinput=" + encode(data) + "&csconnectionstyle=sendonly");
      if (conn != null)
      {
        conn.setUseCaches(false);
        conn.setDoInput(true);
        if (connectTunnel(conn))
          in = getBufferedReader(conn);
        else
          error = true;
        closeTunnel(conn);
      }
      else
        error = true;
    }
    else
    {
      Socket s = getSocket(tunnelHost, tunnelPort);
      if (s != null)
      {
        out = getPrintWriter(s, true);
        in = getBufferedReader(s);
        out.print("POST /CSJava/CSCPROXY.CGI HTTP/1.1\r\n" +
                  "Host: " + tunnelHost + ":" + tunnelPort + "\r\n" +
                  "Content-type: application/x-www-form-urlencoded\r\n" +
                  "Content-length: " + postData.length() + "\r\n\r\n");
        out.print(postData);
        out.flush();
      }
    }
    if (in != null)
    {
      try
      {
        StringBuffer buf = new StringBuffer();
        int input;
        while ((input = in.read()) > -1)
          buf.append((char)input);
        if (!useProxy) out.close();
        in.close();
      }
      catch (Exception e)
      {
        error = true;
      }  
    }
    if (error && debugOut) System.err.println(data + " may not have been sent");
  }

  private BufferedReader getBufferedReader(URLConnection conn)
  {
    BufferedReader result;
   
    try
    {
      result = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    }
    catch (Exception e)
    {
      System.err.println("getBufferedReader error: " + e.getMessage());
      result = null;
    }
    return result;
  }

}

Can't see any obvious problem in your code.
Have you checked what your server is recieving and whether it is blocking?

No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area that this question is:

- points to heyhey_

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next seven days.

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girionis
Cleanup Volunteer