User registration / registration in the GWT application

I have a GWT-based Java application that does some things.

Now I want to implement users and their registration, for example, "forgot password", enter and exit.

My problem is the thing that almost everyone does in their application, but there are many things that need to be done incorrectly (hashing passwords, someone falsifies a “forgot password”, etc.), so there should be some general solution or library .

And I mean, this is like some GUI widget on the client side, and something for the server side, which will process user logins and save their passwords.

Is there something similar?