Need suggestion for choosing Java development enviroment

Hi Evereyone,
I am new to Java Desktop Application.I need help on choosing proper Java technologies and development tool.
We have an existing CLIENT/SERVER based distributed control system, which was developed in C++(Server side) and VB(Client GUI).Now we are think of migrating the system to Java platform.
Here is the outline:
We want to create web based application that will run on windows and linux (linux on embedded PC).
The application should be able to support 10 � 100 users at once accessing/editing database.
We will also need to create a communication server that will run on web server P.C. that will communicate tcpip to field panels/log to db, as well as allow web screens to send/receive commands with field panels etc.
Could any one give me some suggestion about it?
I am thinking of Using J2SE 5.0, including RMI, JDBC and Swing for GUI. As for field panels, may choose J2ME.
Thank you very much in advance.

Thanks, zadok .
Actually, I don't have the system requirements neither. All I know is the following outline:
"We want to create web based application that will run on windows and linux (linux on embedded PC).
The application should be able to support 10 � 100 users at once accessing/editing database.
We will also need to create a communication server that will run on web server P.C. that will communicate tcpip to field panels/log to db, as well as allow web screens to send/receive commands with field panels etc."
It is a interview question, which need me to do research and give some suggestions. What I want to know is to figure out what kind of Java technology is necessary for developing this system because I want to make sure I head to right direction.
I know somehow it is hard to give suggestion based on this limited information.
One more thing I was confusing is the server-side architecture.
I need suggestion about sever side architecture:
a. write a dedicated server-side program, which act
as communication server to monitor and control field
panel, also act as server-side applicaiton by using
RMI to communicate with Client-side communication.
b. choose a general web server architecture. Put
everything in server side in Web Server, for example
Tomcat AS container, implementing the Communication
server as Web Service and the request from
Client-side go to Web Server first, then dispatch to
a proper web service.Why did you not include this information in the original question!
Why don't you just use Tomcat?
For your answer, "Why don't you just use Tomcat?", does it mean Tomcat without Web Service will be enough for this system development? Could you give me some detail about it?
Thank you very much, zadok.

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