What is GregLink?

GregLink is a runtime compatibility bridge that makes GregTech CEu Modern work with KubeJS 2101.7.x on NeoForge 1.21.1.

Starting from KubeJS 2101.7.0, the recipe component API was significantly restructured — class paths were relocated, field types changed, and interfaces swapped with classes. These breaking changes prevent GTCEu from launching, crashing at the world selection screen with a NullPointerException.

GregLink works as a CoreMod, dynamically patching GTCEu's bytecode at startup to resolve these incompatibilities. No GTCEu or KubeJS jar files are modified — deleting GregLink restores everything to its original state.

Features

Zero-intrusion — Does not modify GTCEu or KubeJS jars. All patching happens in memory at launch.
Plug-and-play — Drop it into your mods folder, no configuration needed.
Fully reversible — Remove GregLink.jar and everything reverts.
All core functionality preserved — Machine recipes, materials, world generation, and JEI integration all work normally.

Compatibility

Minecraft: 1.21.1
Mod Loader: NeoForge 21.1+
GTCEu Modern: 7.0.1 / 7.0.2 (7.0.x series)
KubeJS: 2101.7.x

Tested and verified on both GTCEu 7.0.1 and 7.0.2 environments — from startup through KJS script loading to normal gameplay.

Known Issues

GT Shaped Recipe Schema is disabled. The underlying KJS API methods (asPatternKey, STRICT_ITEM_STACK) were completely removed in KubeJS 2101.7.x and cannot be restored. Use KubeJS's native shaped / shapeless recipe types for worktable recipes instead.

License & Credits

GregLink is released under the MIT License.