You should be able to talk to LDAP over JNDI. Is that what you're looking for?

you couls use DAO Pattern to implement your LDAP Modules, look at this url :

www.developer.com/java/ejb/print.php/3077421

Thanks for your reply, im an ERP Product Manager and i want to connect  two erp systems  like a business to business strategy to use look up information from a server.Still Needs much more information.