facebook - How get token from auth facebook4j? -

i write problem in message , put link exception (#number),i trying create web application library facebook4j, want information user account facebook , post information on facebook, in code can json information user or friends, problem token, when work long time exception #1.

i'm generated param setoauthaccesstoken() in graph api explorer copy , paste in setoauthaccesstoken(). how right set , token? how create authentication in web application via facebook4j?

exception #1

facebookexception{     statuscode=400,     errortype='oauthexception',     errormessage='errorvalidatingaccesstoken: sessionhasexpiredonfriday,     25-sep-1511: 00: 00pdt.thecurrenttimeisfriday,     25-sep-1513: 55: 17pdt.',     errorcode=190,     errorsubcode=463,     version=2.3.0 } 

this code:

private final string token_value = "caacedeose0cban5jhf6qs85dccqknde3n9xxjnmye3m7g7re4vpscqn4izwxxoyeqe3qluoh0nguciwjbqfzbpfohtuza60yczczbwd4kcwd4g1qwzcyxy1ihpoivuxzcv1u9ydjnhzcknoosqiqppkzdwpfac8zbedftcvw78gzcbkzchrzfsmxpa3lzc08pza5hrqaoe1bnru1pizahjz4zaem3m";  private facebookfactory facebookfactory; private facebook facebook; private configurationbuilder configurationbuilder; private configuration configuration;  public configurationbuilder getconfigurationbuilder(){     configurationbuilder = new configurationbuilder();     configurationbuilder.setdebugenabled(true);     configurationbuilder.setoauthappid("746931638784611");     configurationbuilder.setoauthappsecret("07e2df67b4fe40e3f2051d79f40387c2");     configurationbuilder.setoauthaccesstoken(token);     configurationbuilder.setusessl(true);     configurationbuilder.setjsonstoreenabled(true);     return configurationbuilder; } public configuration getconfiguration(){     return getconfigurationbuilder().build(); } public facebookfactory getfacebookfactory(){     return new facebookfactory(getconfiguration()); }  @override public string getfriends() {     facebook = getfacebookfactory().getinstance();     try {         responselist<friend> friends = facebook.getfriends();         return friends.tostring();     }catch (facebookexception e) {         e.printstacktrace();     }     return null; }