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How to make apps runnable on a server?

 
Greenhorn
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I modified the ChatClient/Server from the Head First Java book and would like to show it off to my friends. I set up my computer to serve as the server (no pun intended lol) and it worked for two of my computers, but when I tried to send my friend the JAR he couldn't run it because he didn't have up to date Java on his laptop....i think...so is this a perfect situation to make my first servlet? I want my friends to be able to use my chat application with me but I guess they will have to run it off my machine...how does one go about that?
 
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If you like the Head First books, perhaps give Head First Servlets and JSP a try.

Otherwise, there are lots of online resources you can find.

Be aware that running a server from your personal machine involves a great deal of attention to security issues.
 
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