logon to Project Server

Hi

i'm trying to logon to Project Server via a webservices located in the PSI (LoginForms) via a java application.

i read the documentation available in: http://msdn.microsoft.com/en-us/library/office/ms455600(v=office.12).aspx

the code given is in c# / vb and i want to know how to use it in my java code.