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Thread: Problems with connecting two sockets on the same application.

  1. #1
    Junior Member
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    Nov 2009
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    Default Problems with connecting two sockets on the same application.

    I have two applications running on the same computer. They are to converse with each other via TCP/IP sockets.

    Application 1 is a second party application and I have no control over how it handles IO. It has two connections 1 is a write port and the other a listen port and when it is connecting to applications on the same computer then the ports cannot be the same.

    Application 2 is my Java application that is to receive data from and pass data to Application 1. It accepts the connection of Application 1 by using a ServerSocket.accept() method. However there is a problem when I attempt to create a Socket that connects to the listen port of Application 1. When I attempt to create the second socket the socket that is created from the ServerSocket.accept() closes or stops the InputStream.

    I need to have way for Application 2 to listen to the port that Application 1 writes to and write to the port that Application 1 listens to and they must be able to handle this at the same time.

    Does anyone know what I could be doing wrong? Here's an example of what I'm seeing:

    ServerSocket receiver = null;
    Socket socket1 = null;
    Socket socket2 = null;

    receiver = new ServerSocket(6001);
    socket1 = receiver.accept();
    // here I would start handling socket1.getInputStream();
    socket2 = new Socket("", 6002);
    // the line above breaks the InputStream from socket1
    catch(Exception e)


  2. #2
    Super Moderator Json's Avatar
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    Jul 2009
    Warrington, United Kingdom
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    Default Re: Problems with connecting two sockets on the same application.

    Why use two different ports for reading and writing?

    Why not just open one socket and read/write on it?

    // Json

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