i am trying to develop firebase admin sdk in java but unable to get data from database -


according firebase documentation trying make firebase admin sdk but unable can please guide me develop firebase admin sdk. enter code here

class firebasetest { public static void main(string[] arg) throws ioexception    {            fileinputstream serviceaccount = new fileinputstream("d:/firebase project/databaseproject-ff7ab-firebase-adminsdk-t7rdd-7950c0f27b.json");        firebaseoptions options = new firebaseoptions.builder()            .setcredential(firebasecredentials.fromcertificate(serviceaccount))            .setdatabaseurl("https://databaseproject-ff7ab.firebaseio.com/")            .build();        firebaseapp app=  firebaseapp.initializeapp(options);         task<userrecord> defaultauth = firebaseauth.getinstance(app).getuserbyemail("example@gmail.com");         firebasedatabase defaultdatabase = firebasedatabase.getinstance(app);         databasereference ref = firebasedatabase            .getinstance()            .getreference();              ref.addvalueeventlistener(new valueeventlistener() {            public void ondatachange(datasnapshot datasnapshot) { //this method call after 3 sec when execution completed                object document = datasnapshot.getvalue();            }          public void oncancelled(databaseerror arg0) {             // todo auto-generated method stub             system.out.println("cancelled");         }        });            // attach listener read data @ our posts reference             system.out.println(ref.getkey()+".....");             system.out.println(ref.getspec());              system.out.println(defaultauth.getexception());     } }


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