how to connect facebook and redirect to web project.

I want to connect facebook from my project (Gameplay). My site having singin / singup details, using this I automatically create an account or signin into my Gameplay project. Here there is another option for signin i.e using facebook connect. whenever I click on facebook connect button at that time I login in facebook and using those details of facebook, I want to create an account in my Gameplay project.

I completed the task i.e how to connect facebook from Gamepaly project but I didn't know how to retrieve the facebook user account details after signin into facebook into my Gameplay project.

I am using java, jsf, hibernate technologies for this project.
Help me how to resolve this.