How do I establish a connection to another Java program on the net?

Hi all,
I have been reading the java tutorial to find a solution to my problem but I havent really found what Im looking for.
I want to establish a connection that allows a client to get a copy of an object from a running java-application on a server on the internet.
I have read about the Socket-class but the tutoral advices only to use it on a locale network. I know IDL and RMI only by name - is this what I should be reading about?
If one of you guys have a source-code example on how to make java programs communicate over the net, please post it!
Regards Albert

Assuming this is "wide area" stuff, not just on a local area network, your best bet is to stick to http connections. You need a web server, probably Tomcat.
Your client can connect using URL.openConnection().
As to protocols you could use SOAP. It has the advantage that you can get the code for it for free, but it can be pretty complicated to configure. In particular it only knows how to transmit a limited set of object types and if you want to go beyond them you have to write converters. SOAP servers typically run under an web server anyway. SOAP converts all the data to XML for transmission.
However it may be simpler to use Java's built in serialisation facility and send your data as an ObjectStream.
In the set up you're talking about the message going to the server seems a lot simpler than the response. It may make sense to send your data as normal keyword parameters of a POST transaction but to have the server respond with an Object stream. That's well within the normal operation of a web server.

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