Can i use JEE server for my Android app?

Hello,
Let me introduce myself,i am Mohith K M from India,Student and beginner in JEE
I am doing a project,Which is combination of Android application,Server and Desktop app (developed in Visual C# )
I am comfortable with Android app side,
Bt, i dont have an idea About j2ee Server side?
Where should i start studying
What protocol should i use? SOAP?
Wat my project exactly do is
There are many Desktop application (devlpd in visual C#),These app will have database,and these is to be updated to Database @ server side, (MYSQL??)
and Android application will request with some query to J2ee Server;Now J2ee Server have to respond back,after applying some bussiness logic in b'wn
Please help me out,Where should i Start!
I was planing to use Glassfish server,j2ee;

You learn the same things as you would learn for any JEE application;
- learn about EJBs (3.0 standard, not the earlier iterations!)
- learn JPA (optionally, low level JDBC can also work fine)
- learn about EJB webservices (and it might not hurt to learn about SOAP in general)
You shouldn't need a web interface as this is all server side, so you don't need to go into JSF or any other web framework. For your purposes, I can recommend the book "Enterprise Javabeans 3.0" by O'Reilly. It will teach you all you need to know. If you want to learn about JPA, I can highly recommend the book "Pro EJB 3: Java Persistence API" by APress.

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