JAVA:java.net.BindException: Address already in use: JVM_Bind [duplicate]

I've wrote these two classes, one for client and the other for server. When I run both of them I get the following error:

java.net.BindException: Address already in use: JVM_Bind...

What is the problem? Also I use TCPview software and there were just two java.exe that use the same port. These two java.exe processes belong to the apps.

Here is the code:

Server Code

/**
*
* @author casinoroyal
*/
public class server {
    public static ServerSocket socket1;
    public static void main(String[] args)  {
        try {
            socket1 = new ServerSocket(1254);
            String request="";
            Socket mylink=socket1.accept();
            System.out.println("server feels=====");
            DataInputStream input= new DataInputStream(mylink.getInputStream());
            DataOutputStream output=new DataOutputStream(mylink.getOutputStream());
            Scanner chat=new Scanner(System.in);

            while(!request.equals("QUIT")){
                request=input.readUTF();
                output.writeUTF(chat.next());
            }

            socket1.close();
        } catch (IOException ex) {
            System.out.println(ex);
        }
    }
}

Client Code

package javaapplication9;
import java.net.*;
import java.io.*;
import java.util.*;
public class client {
    //main
    public static void main(String[] args)  {
        System.out.println("client want to be connected");   
        try {
            Socket mysock = new Socket(InetAddress.getLocalHost(),1254);               
            System.out.println("client has been connected");  
            DataInputStream input = new DataInputStream(mysock.getInputStream());
            DataOutputStream output = new DataOutputStream(mysock.getOutputStream());
            String reque="";
            Scanner scan1=new Scanner(System.in);
            String sendmsg=scan1.next();

            while(!reque.equals("QUIT")){
                output.writeUTF (sendmsg);
                reque=input.readUTF();
            }

            mysock.close();
        } catch (IOException ex) {
            System.out.println("client rejected"+ex);
        }
    }
}