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

Question

Server Program:

 import java.io.*;
 import java.net.*;
 class Server{
   public static void main(String args[]){
    try{
        ServerSocket ss = new ServerSocket(8080);
        Socket s = ss.accept();
        DataInputStream dis = new DataInputStream(s.getInputStream());
        String str = (String)dis.readUTF();
        System.out.println("Message : "+str);
        ss.close();
    }catch(Exception e){
        System.out.println(e);
    }
  }
}

Client Program:

import java.io.*;
import java.net.*;
class client{
  public static void main(String args[]){
    try{
        Socket s = new Socket("localhost",8080);
        DataOutputStream dos = new DataOutputStream(s.getOutputStream());
        dos.writeUTF("Hello friend ");
        dos.flush();
        dos.close();
        s.close();
    }catch(Exception e){
        e.printStackTrace();
      }
    }
 }

When I execute this program. I got an error like this "java.net.BindException: Address already in use: JVM_Bind" But before it works fine. Please anyone help me with this issue?

Perhaps two instances of the same process running at the same time, trying to bind to the same port twice? — Fermin Silva
– Fermin Silva, Commented Aug 6, 2015 at 19:47

dbush · Accepted Answer · 2015-08-06 19:48:15Z

6

If you're restarting the server side of your program multiple times, there may be sockets in TIME_WAIT hanging around that prevent you from listening on port 8080 again.

You need to set the enable the reuse option (socket option SO_REUSEADDR) as follows:

ServerSocket ss = new ServerSocket();
ss.setReuseAddress(true);
ss.bind(new InetSockAddress(8080));

answered Aug 6, 2015 at 19:48

dbush

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