java - Address already in use: JVM_Bind. Sockets Chat -

i have program chat sockets, 1 multicast , unicast other, when trying run both following error:

java.net.bindexception: address in use: jvm_bind @ java.net.dualstackplainsocketimpl.bind0(native method) @ java.net.dualstackplainsocketimpl.socketbind(dualstackplainsocketimpl.java:96) @ java.net.abstractplainsocketimpl.bind(abstractplainsocketimpl.java:376) @ java.net.plainsocketimpl.bind(plainsocketimpl.java:175) @ java.net.serversocket.bind(serversocket.java:376) @ java.net.serversocket.<init>(serversocket.java:237) @ java.net.serversocket.<init>(serversocket.java:128) @ chat.chatprivado_servidor$hilo.run(chatprivado_servidor.java:47) 

apparently error in chatprivado_servidor class thread, put them code me please. excuse bad english

class chatprivado_servidor

class hilo extends thread {     string msgin = "";     public void run() {         try{          ss = new serversocket(1500);          s = ss.accept();           din = new datainputstream(s.getinputstream());          dout = new dataoutputstream(s.getoutputstream());          while(!msgin.equals("exit")){             msgin = din.readutf();             textarea.settext(textarea.gettext().trim()+"\n   "+msgin);          }      }catch(exception e){         e.printstacktrace();     }     } } 

class chatmulticast

private void send(string mensaje) throws ioexception {     string mensaje2 = nombre + ": " + mensaje;     byte[] buffer_e = mensaje2.getbytes();     datagrampacket paquete_enviado = new datagrampacket(buffer_e, 0, buffer_e.length, direccion, 4321);     socket.send(paquete_enviado); }  class reader extends thread {     public void run() {         byte[] buffer_r = new byte[512];         datagrampacket paquete_recibido = null;          while (true) {             try {                 paquete_recibido = new datagrampacket(buffer_r, buffer_r.length);                 socket.receive(paquete_recibido);             } catch (ioexception e) {                 e.printstacktrace();             }             string linea = new string(paquete_recibido.getdata(), 0, paquete_recibido.getlength());         }     } }  chatmulticast(string n) {     nombre = n;     try {         direccion = inetaddress.getbyname("228.5.6.7");         socket = new multicastsocket(4321);         socket.joingroup(direccion);     } catch (exception e) {         e.printstacktrace();         system.exit(1);     } 

}

i have placed ports , accepts me none

it looks you're trying create multiple serversockets on same port.

your code structure incorrect.

you should create single serversocket, have loop accepts connections , spawns thread each accepted socket, , class provides runnable threads, 1 instance per thread, run() method contains loop reading requests , responding them until end of stream detected.

i suggest read custom networking section of oracle java tutorial.