IOexception sending an Object to a server (socket connection)

Question

This is a homework assignment just to clarify.

The problem is, I have a client and server connection however I am sending a class I made namely "Course", through to the server over a socket connection (TCP). This is where I am encountering a problem with an IOexception.

public void handleMessageFromClientUI(Object message)
  {
    try
    {
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("message.ser"));

      sendToServer(out);
    }
   catch(IOException e)
   {
      clientUI.display
        ("Could not send message" + e.getCause());
    quit();
    }
  }

I'm sending a course object that I have serialized, but I keep getting the cause of the exception as being null. For the purpose of simplicity and because I have a lot of other classes and code I've only put this snippet here, however I can add more if needed. Any help to point me in the right direction would be greatly appreciated!

I have added sendToServer() on request

final public void sendToServer(Object msg) throws IOException {

        if (clientSocket == null || output == null){

            throw new SocketException("socket does not exist");}

        output.writeObject(msg);
    }

Further testing shows that I may have the variable output as null which is why I get the exception.

output = new ObjectOutputStream(clientSocket.getOutputStream());

That's the initializing statement for output, very confused but I think I just moved a step forward.

Thanks.

I have tested whether the object is null by printing it, and I get an output for that. — Mjall2, Nov 23 '14 at 07:09
Telling us you have an `IOException` without providing a stack trace is futile. — user207421, Nov 23 '14 at 08:52

score -1 · Answer 1 · answered Nov 23 '14 at 07:42

-1

The object message received in the handlemessagefromUIclient did not need to be serialized to be sent over the connection!

answered Nov 23 '14 at 07:42

Mjall2

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Surely you mean it *did* need to be *`Serializable`*? – user207421 Nov 23 '14 at 08:52

IOexception sending an Object to a server (socket connection)

1 Answers1