Match Java to Minecraft

The runtime must match the game#

Java is the runtime that executes a Minecraft server. A Java release can be too old for a newer server, while some old mod loaders or mods do not support the newest Java. Crafty’s container may include several Java versions; choose the one required by the exact Minecraft release.

Recognize a Java error#

“Unsupported class file major version,” “compiled by a more recent version,” or a message requesting a specific Java release usually means the selected runtime is too old. Immediate crashes involving removed Java modules can mean it is too new for an old pack.

1. 1
   Stop the server in Crafty.
2. 2
   Open the server’s Config or launch settings.
3. 3
   Find the Java executable/runtime override.
4. 4
   Select the release required by that Minecraft and Fabric combination.
5. 5
   Save, start, and read the first error—not just the final “process exited” line.