Issues upgrading from Java 8 (Upgrade loop) - MegaMek/megamek GitHub Wiki

Imagine you're prepped for an epic showdown, primed to conquer in the latest Dev or Milestone release of your favorite game. You're all set, engines roaring, but Java 8 throws a wrench in the works – it demands Java 11 and nudges you towards an update.

Here comes the twist: You upgrade, press 'run', and... whoosh, it's déjà vu! The same update prompt pops up again. The culprit isn't the game; it's Java 8 playing tricks. When Oracle open-sourced Java, they halted updates for their JRE version, trapping you in a loop that keeps circling back to Java 8. It's like a Locust in a NASCAR race – round and round with no finish line in sight.

But there's a ray of hope: the MegaMek team has crafted an easy-to-follow guide for transitioning to an open-source Java version. Follow our instructions, and soon you'll be back in the game, ready to show your friends who's the real boss.

https://github.com/MegaMek/megamek/wiki/Updating-to-Adoptium