java - FXML controller and Threads -

so, i'm coding college assignment , got stuck in part have build thread socketserver open new threads each client connection. here's java code:

this method linked setonaction of button:

 void openserver(){     new serverthread().startthread(); } 

this method called method above:

public class serverthread implements runnable{    private serversocket serv;   @override   public void run(){         try {             serv = new serversocket(1234);             while(true){                 socket sc = serv.accept();                 system.out.println("someone connected!");                 thread t = new thread(new clientthread(sc));                 t.start();             }         } catch (ioexception e) {             system.out.println("erro no servidor");         }    }     void startthread(){        thread t = new thread(new serverthread());        t.run();    }  } 

this thread called code above:

public class clientthread implements runnable{     private socket sock;     @override    public void run() {        try {            bufferedreader in = new bufferedreader(new inputstreamreader(sock.getinputstream()));              while(true){                 int cmd = in.read();                 if(cmd == 1){                     //register                 } else if (cmd == 2){                     //login                 }             }         } catch (ioexception e) {              system.out.println("erro no socket");         }      }     public clientthread(socket s){         this.sock = s;     } } 

the problem is: when button clicked, application stop responding, if application , socketserver running @ same thread, want know happening , fix it.

the mistake @ startthread() method, call thread should t.start() wrote t.run(). yes dumb, @james_d in comments.