Facebook Java Server

Hey all, have a question for you. I have a web service written in Java that handles requests from a BlackBerry App, i want this app to be able to post to FB, but i don't want the user to be prompted to go to a website on the device to log in and be verified, i wanna do something like XAuth does with Twitter, sending username and password once to get an access token and be able to use that to do petitions to Facebook. I only need to post to the wa开发者_运维知识库ll right now, any idea how i can achieve this?

You need to ask the user to give you offline access to its account, then your app can post etc to the user profile even after the user has gone offline