authentication for google appengine java

[Rajesh G]

Hello,

I have been using java app engine for few years now.

My app is using UserService for authentication in the servlets

Now, I am creating a new app.

I am exploring what options are available for authentication for use with java appengine.

I checked around firebase authentication.  But, did not understand the whole process.

There is a python example. I dont' know python.

Any examples of java appengine authentication using firebase or other auth techniques?

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Field Service Software on Google Cloud Platform and Mobile

[Rajesh G]

Hello All,

Any examples on how to use firebase authentication with java appengine standard.  

Documentation did not help me much and dont' know how to put the pieces together in a java servlet environment.

[Osvaldo Lopez Acuña]

Google offers multiple methods of authenticating your app's users in Cloud Platform applications. Each method has different purposes. Maybe this example can help you. In Firebase, when you see an Android example, it refers to a Java one. Also, at the end of the firebase home page you can find this example:

FirebaseAuth auth = FirebaseAuth.getInstance();

auth.signInWithEmailAndPassword(email, password)

    .addOnCompleteListener(new OnCompleteListener() {

        @Override

        public void onComplete(Task task) {

            if (task.isSuccessful()) {

                FirebaseUser user = task.getResult().getUser();

                String email = user.getEmail();

                // ...

            }

        }

    });

You can also look at this document that could be helpful.