java - Serialized object has null values after sending via udp -

i have set udp client/server model can send string messages each other.

i've created custom class loginrequest serialized , sent server containing username , password. when getters these variables called return null values though check variables before loginrequest sent.

here code serializing , sending datagram client:

private void login(string name, char[] pass) throws sqlexception {     try {         loginrequest login = new loginrequest(name, pass);         bytearrayoutputstream baos = new bytearrayoutputstream();         objectoutputstream oos = new objectoutputstream(baos);         oos.writeobject(login);         byte[] buffer= baos.tobytearray();         oos.close();         baos.close();         datagrampacket packet =                 new datagrampacket(buffer, buffer.length, inetaddress.getbyname(server), 10110);         datagramsocket ssocket = new datagramsocket();         ssocket.send(packet);         login.getusername();      } catch (exception e) {         e.printstacktrace();     } } 

here code de-serializing loginrequest , reading username:

private void readmessage() {     try {             bytearrayinputstream bais = new bytearrayinputstream(cpacket.getdata());             objectinputstream ois = new objectinputstream(bais);             object obj = ois.readobject();             bais.close();             ois.close();             if(obj instanceof loginrequest) {                 system.out.println("login request");                 loginrequest login = (loginrequest) obj;                 login.getusername();             } else {                 system.out.println("not login request");             }         } catch (exception e) {             e.printstacktrace();         }     } 

here code loginrequest:

public class loginrequest implements serializable { /**  *   */ private static final long serialversionuid = -1379800611469143228l; private static string username; private static char[] password;  public loginrequest(string name, char[] pass) {     username = name;     password = pass; }  public string getusername() {     system.out.println("username: " + username);     return username; }  public char[] getpassword() {     string p = password.tostring();     system.out.println("password: " + p);     return password; } } 

when attempt read username or password after deserialization, nullpointerexception. extremely happy if can point me in right direction.

drop static on attribute usename , password!