Java IM with mysql driven site

I have a mysql driven site done completely in php, both the site and message board. I am about to add an instant messenger and possibly a chat room. It's a client-server instant messenger. I am installing the communications server file on my Linux server, and the client for the IM is in java. I don't want to have a seperate login, or for that matter a login at all for the instant messenger. I want the IM client to check my database for the person's user name. How can I make a server application access my database. THe IM provider will not give me the scripts unless I use thier message boards. Is it the java I need to make changes to or do I need to have something communicating between the two?