Hi
  This is control flow.
 ActionServlet-->Thread1-->Thread2
The thread2 is this.
public class NVTPrinter extends Thread {
    PrintWriter out;
   NVTInputStream inStream;
   int j;
   StringBuffer arr;
   public NVTPrinter(NVTInputStream in, StringBuffer arr) {
    super();
    inStream = in;
    this.arr=arr;

   }

   public void run() {
   boolean finished = false;
      try {
       do {
           int i = inStream.read();
        if (i==-1) finished = true;

        else {
             if(((byte)i)!=((byte)255))
              {
                 arr=arr.append((char)i);

              }
             yield();
            }

         }

       while (!finished);

       }
      catch (IOException ex) {
         System.out.println("NVTPrinter error");
    }
   catch(NullPointerException e)
   {
       System.out.println(""+e.toString());
   }
    }
}
Here is my Thread1
public Telnet2(String command,Socket sock,StringBuffer buf) {
    this.command=command;
    this.connection=sock;
    this.buf=buf;
    try {
       outStream = new PrintStream(connection.getOutputStream());
       inStream = new
NVTInputStream(connection.getInputStream(),outStream);
       }
    catch (IOException ex)
       {
        error ("IO error getting streams");
        }
    }

       /*
     * calls NVTPrinter for accepting the inputs
     * runs the actual thread
     */

    public void run()
    {
     printer = new NVTPrinter(inStream,buf);
     printer.start();
     yield();
     outStream.println(command);
     yield();
    }
And here is my ActionServlet
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws
Exception {

   String com2=((Pushlet2Form)form).getCom1();
   Socket sock=(Socket)request.getSession().getAttribute("id");
   StringBuffer
arrprint=(StringBuffer)request.getSession().getAttribute("str");
   try {
          Telnet2 tio=new Telnet2(com2,sock,arrprint);
       tio.start();
       Thread.sleep(1000);
       String value=arrprint.toString();
       ((Pushlet2Form)form).setValue(value);
       return mapping.findForward(FORWARD_lastpage);
       }

          catch(NullPointerException e)
       {
              return mapping.findForward(FORWARD_lastpage);
       }
    }

   }
i think this is what u mentioned.and this may help you.