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It's definitely possible, but I haven't done it, besides manually unzipping / editing / rezipping sometimes. I think Beaming does it with normal development tho so maybe he can comment on his setup.

It is just a normal JAR with your class files + the .properties file. So whatever means you have of creating a JAR should work.

then ask beaming then

Why did you post this? It's impolite and not helpful.

i told Wolfman to ask Beaming

You can use Ant to package your jar, here is an example script (that I wrote) to do it. Since I mainly develop in eclipse I didn't want to switch over to Robocode to package my robot.

See the page Ant (tool).