then what are the correct words?
As I read in other post made by you, you are rewriting the server side code in java, have you ever ask yourself why almost all AAA games are written in C language (C,C+,C++) and not in java?
Basically what he intends to do is to create a NEW source in Java for the server. Basically the client will still connect with the same functions but, Java will be handling the data transmission instead of C++. It's all about packets and how they are controlled. There are many other games that share the same ideas as far as the server side is concerned. Basically they are more emulator based but, the theory is still sound.