Using RMI for bidirectional communication

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Hi,

I've set up SSL-secured RMI server and client. The clients are able to  
access the server without any problem, but now I want the server to be  
able to use a callback to talk to the client. This works if the client  
is reachable (meaning it is not behind a NAT or firewall), but I'd  
very much like to be able to provide the same access for firewalled  
clients. Polling seems like a bad solution, and hopefully I won't need  
to do that...

I have searched the archives and talked to a lot of people in java  
support channels on IRC, but they weren't able to say anything  
definite about the subject - many said it should just work, others  
said that callbacks can never work (which by now I know to be untrue).  
Is there a way for the server to use the already existing connection  
to the client to communicate with it (other then respond to method  
calls), and how can I do that?

Thanks for your ideas! If you need example code or more explanations,  
I'll gladly provide that.

Thanks
Sebastian
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