Treads in multiplayer

Hello!
I'm programming the multiplayer game. The server consist of servlets and beans, the clients are applets. The game must have many sessions(like rooms) where the players can play. I have the problem:
Client send to server some information(number of the room, name of the client and for example some changes of the coordinates, or some else information), the server must send this information for the other clients. But in the same moment the other client can send the information too(in this or another room) and this information will be lost or smth else. What can i do with this problem? I think about the threads, but i never worked with treads in java, and would i run thread for every client or for every session?
Can You give me a piece of advice?

When I do that I get "java.lang.NoClassDefFoundError: Doc4j/userThreads=true" and I get a pop up that says
"can not find main class. Program will exit"? It is necessary to use the "-D" switch to specify a VM parameter. If you omit the dash then the VM thinks that you are
specifying the application entry point (a class with a public static void main(String[]) declared). Since there is no
Doc4j.userThreads class you get a NoClassDefFoundError.
Please use '-Doc4j.userThreads="true"'.

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