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The more important question is which java version is run by clients of a rumble. If your bot is compiled with newer version and the rumble client runs with older java, it will simply refuse to start a battle with your bot. So you will get your stats slower if ever.

I personally run everything with version 7 of the open jdk.

Ok, thanks, i just understand that best way to determine max possible java version is to check class version of few active bots