Check out this post! It’s RMI stuff.

http://n3tg33ks.wordpress.com/2007/11/18/ketemu-masalah-lagi-di-rmi/

actually i juz want to say that it’s work, the issue has been solved by multithreading

Those 3 running server are use their own thread and image below

is result of two methods that placed on different class.