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I've tried to start jackpot session, but it failed with attached NPE.
Created attachment 26906 [details] Netbeans log
Appears to be a problem with path conversion on Windows systems, will confirm as soon as I can set such a system up.
jackpot was including source files found in jar files (some of core's unit tests have them), and javac couldn't handle jar URLs. I've turned off jar expansion in jackpot.