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I finally figured it out!

I had been copying the .jar files directly into the robots folder, when I should have been using the Import Downloaded Robot tool. I guess the tool tells Robocode to treat bots differently from just .jar files.

Would this be something of interest to fnl or any of the other Robocode developers?

Nice! If you can reproduce it, I'd definitely report it. I can't imagine it's intentional those two operations would take different code paths. I've only ever copied JARs into the robots directory.

Oh, I thought this was some other option to add the robot to the repository/cache, but that's actually just the option for extracting the JAR to source files. So you have to extract every JAR for every robot to not get these errors?

I think you are confusing the Import downloaded robot tool with the Extract downloaded robot for editing tool.

Anyway, yeah, it seems I'll have to import each robot individually from now on.

Ahh, you're right of course. I thought those were both options, but I launched Robocode and only saw the one and thought it had just been renamed. But "Extract..." is only offered in the Editor.

Is it giving you trouble with the compiler when you just copy in the .jars? Because if so, that is very strange...

I've always just copied the .jars, but then I don't use the built in editor, I use jGrasp.

Actually, I don't think it has anything to do with the compiler. That was just an early hypothesis I had because every time I compiled, it said it was "Updating classpath: [...]\robots," and it got all the errors.