How to create a simple inbox and messaging in java?

Anyone know how to create a simple message inbox for a server in java?I'm not sure where to start but I believe It would just require an inbox class and messaging class perhaps? This code would be like a java server page and the messaging only takes place on the local server (no TCP) involved. Can anyone provide some examples or at least where to begin? I've tried google and there are no code examples.|||There is the jms API. I never dug deep into it because the phone provider has to participate, from what I understand.