facebook sdk 4.0 - Getting Unknown Host Exception While using RestFb -

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i want connect data facebook using restfb throwing unknown host exception .

my code 

package com.resrfb; import com.restfb.defaultfacebookclient; import com.restfb.facebookclient; import com.restfb.types.user;  public class simplemeexample {      public static void main(string[] args) {           facebookclient facebookclient= new defaultfacebookclient("key");           user user = facebookclient.fetchobject("me", user.class);          system.out.println("user="+ user);         system.out.println("username= "+ user.getusername());         system.out.println("birthday= "+ user.getbirthday());      }  }

also wanted know how data user login web app using restfb here geeting accesstoken manually how user when logging in using facebook sdk.

stack trace

exception in thread "main" com.restfb.exception.facebooknetworkexception: network error occurred while trying communicate facebook: facebook request failed (http status code null)     @ com.restfb.defaultfacebookclient.makerequestandprocessresponse(defaultfacebookclient.java:1024)     @ com.restfb.defaultfacebookclient.makerequest(defaultfacebookclient.java:952)     @ com.restfb.defaultfacebookclient.makerequest(defaultfacebookclient.java:914)     @ com.restfb.defaultfacebookclient.fetchobject(defaultfacebookclient.java:392)     @ com.resrfb.simplemeexample.main(simplemeexample.java:14) caused by: java.net.unknownhostexception: graph.facebook.com     @ java.net.plainsocketimpl.connect(plainsocketimpl.java:195)     @ java.net.sockssocketimpl.connect(sockssocketimpl.java:366)     @ java.net.socket.connect(socket.java:529)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.connect(sslsocketimpl.java:559)     @ com.sun.net.ssl.internal.ssl.basesslsocketimpl.connect(basesslsocketimpl.java:141)     @ sun.net.networkclient.doconnect(networkclient.java:163)     @ sun.net.www.http.httpclient.openserver(httpclient.java:394)     @ sun.net.www.http.httpclient.openserver(httpclient.java:529)     @ sun.net.www.protocol.https.httpsclient.<init>(httpsclient.java:272)     @ sun.net.www.protocol.https.httpsclient.new(httpsclient.java:329)     @ sun.net.www.protocol.https.abstractdelegatehttpsurlconnection.getnewhttpclient(abstractdelegatehttpsurlconnection.java:172)     @ sun.net.www.protocol.http.httpurlconnection.plainconnect(httpurlconnection.java:911)     @ sun.net.www.protocol.https.abstractdelegatehttpsurlconnection.connect(abstractdelegatehttpsurlconnection.java:158)     @ sun.net.www.protocol.https.httpsurlconnectionimpl.connect(httpsurlconnectionimpl.java:133)     @ com.restfb.defaultwebrequestor.execute(defaultwebrequestor.java:374)     @ com.restfb.defaultwebrequestor.executeget(defaultwebrequestor.java:96)     @ com.restfb.defaultfacebookclient$3.makerequest(defaultfacebookclient.java:965)     @ com.restfb.defaultfacebookclient.makerequestandprocessresponse(defaultfacebookclient.java:1022)     ... 4 more

your machine cannot connect facebook, error on lower level , not restfb dependent. should check dns settings, hosts file , proxy settings.


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