java.net. SocketException: Descriptor not a Socket

What in god's name does this mean?  I'm passing a socket to the constructor of a Thread subclass.  This class consists of ONLY this constructor and a run() method that prints to the output stream of the socket. When I call the run() explicitly it WORKS. But, when I call start() on the object (which call the run() method) it gives me the message in the title.  WHY?

e.g. (note I'm leaving out code for simplicity, including the try & catch block where I caught the error, but it occurs when I flush the BufferedStreamWriter)

import java.net.Socket;
import java.io.*;
public class a extends Thread{
    Socket moSocket = null;
    public a(Socket poSocket){
      moSocket = poSocket;
    }
    public void run(){
      //Assume that I defined a BufferedStreamWriter with       //the socket already.
      bsw.write("Testing");
      bsw.flush();
    }
}

 
ho174Asked:
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ho174Author Commented:
Forgive me for my forgetfulness.  There is no BufferedStreamWriter, rather it was a BufferedWriter that encapsulated the OutputStreamWriter, which encapsulated the Socket.getOutputStream().  This note was just for clarification, I still have that error.  Thanks for the help
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aleshkaCommented:
It look like you do something "bad" with this socket in method which calls a's start(), directly after this call. (for example: simple close the socket). So, if you call run method, which doesn't returns immediately - its ok, but when you try to call start, which will run the new thread and return at the same time, you have time to kill the socket before it will start to work.
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