Old tcp server client game

Question

I’m using the netbeans, and the program and what is on this link: Rooster Game / Old Game with Application Level Protocol

First I run the server says : server is running then run the client: and error appears on lines 28 and 187 but does not say what kind of error is, the lines are these :

try
    {
        server = new ServerSocket(5000,2);  // <- linha 28 erro !
    }

and the other mistake is this:

public static void main( String args[] ) 
{
    JFrame.setDefaultLookAndFeelDecorated(true);
    TicTacToeServerProtocolo game = new TicTacToeServerProtocolo(); // <- erro 187 nesta linha !!
    game.execute();
}

Both errors are from the program "Tictactoeclientprotocol.java"

Correct me if I’m doing something wrong. The game in question is the "Tic-tac-toe" as it is on the link I provided from this site also, it is an equal issue but related to notepadd++ but the objective is the same namely to run the server and the client at the same time (old game).

I know this code works (Tictactoe) because I saw it work on a friend of mine who gave me this code. He also used netbeans.

In the output "Output" this message appears exactly:

run:

java.net.BindException: Address already in use: JVM_Bind
    at java.net.DualStackPlainSocketImpl.bind0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketBind(DualStackPlainSocketImpl.java:106)
    at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:382)
    at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:190)
    at java.net.ServerSocket.bind(ServerSocket.java:375)
    at java.net.ServerSocket.<init>(ServerSocket.java:237)
    at java.net.ServerSocket.<init>(ServerSocket.java:181)
    at TicTacToeServerProtocolo.<init>(TicTacToeServerProtocolo.java:28)
    at TicTacToeServerProtocolo.main(TicTacToeServerProtocolo.java:187)

Java Result: 1

BUILD SUCCESSFUL (total time: 0 seconds)

Answer 1

That mistake of Address already in use: Jvm_bind means you already have some application running on that port, you need to delete this application or change its port from 5000 to another higher value.

The higher, the lower the chance of being used.

To find who is using this door can do so:

Windows

1. Execute resmon.exe

2. Networks Tab > Listening Ports

Linux

netstat -tulpn