multithreading - Java: Socket closing after try-catch blocks -

i attempting client/server type chat box (using gui's). won't details of multi-threading used in program since believe not part of problem (i hope not) , amount of code post. anyways, both client , server create socket, , other stream classes within try block, , reason sockets close after catch blocks. ps not call socket.close() method anywhere end if early

server, ran constructor of 1 of class. breaks down into, main has server stuff on different thread, (like previous post) fix gui can load , run server stuff without 1 waiting on other. anyways, without detail, here code

    public chatappprotocol(socket sock)      {         super("chatappserver");         // has clas var of socket         this.sock = sock;          try (             printwriter output = new printwriter(this.sock.getoutputstream(), true);             bufferedreader input = new bufferedreader(new inputstreamreader(this.sock.getinputstream())) ;         )          {            // first stream of string username loging in client             string name = input.readline();            // returns false, not closed            system.out.println("closed?: " + this.sock.isclosed());          }         catch (ioexception e)          {             e.printstacktrace();         }         // problem!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!         // closed after catch blocks  before methods ends         // p.s. plan on using socket in method can't since closes         system.out.println("closed?: " +this.sock.isclosed());      } 

now client

@fxml private void login()  {         this.name = this.username.gettext().trim();         this.portnum = integer.parseint(this.port.gettext());         this.name = this.username.gettext().trim();         this.ipaddr = this.ip.gettext().trim();          try (t             socket socket = new socket(this.ipaddr, this.portnum);             printwriter output = new printwriter(socket.getoutputstream(), true);         )          {             this.sock = socket;             output.println(this.name);             // returns false, not closed             system.out.println("closed?: " +this.sock.isclosed());         }          catch (unknownhostexception e)          {             system.err.println("problem @ ip: " + this.ipaddr);             system.exit(1);         }           // problem!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!         // returns true here, closes before methods end , cant reuse         system.out.println("is closed!!!!!! " + this.sock.isclosed());     } } 

so, reason why both different class, different files, different project sockets close after try-catch blocks? can't find answer online, , been on while , stuck. found out problem after seeing on server side console

  java.net.socketexception: socket closed @ java.net.socket.getoutputstream(socket.java:943) @ chatappserver.chatappprotocol.run(chatappprotocol.java:62) 

because you're creating socket brackets of try block, automatically closed upon exiting block. instead, try creating inside block , shouldn't closed:

try {     this.sock = new socket(this.ipaddr, this.portnum);     printwriter output = new printwriter(socket.getoutputstream(), true);     output.println(this.name); } catch (unknownhostexception e) {     system.err.println("problem @ ip: " + this.ipaddr);     system.exit(1); } // this.sock should still open @ point. 

have read of java tutorial on try-with-resources more information on why you're getting current behaviour.