AEKey Legacy

1.20.1 Applied Energistics 2's AEKey API port, adapted as much as possible to the 1.12.2 environment.

49 Downloads

forge

About this Mod

AEKey Legacy is a library mod for Minecraft 1.12.2 that backports the AEKey API from AE2 version 1.20.1. This mod does not add any game content itself and serves only as a prerequisite for the development and use of other mods.

The following are the main adaptations made during this backporting process:

Adjusted the isTagged method of AEKey to change its parameter from TagKey<?> to String, and modified the overridden methods to be compatible with the Ore Dictionary system.
Changed the return type of AEKeyType.getTagNames from Stream<TagKey<?>> to Stream<String> to also adapt to the Ore Dictionary system.
In AEItemKey, the original cachedDamage field was renamed to metadata. Methods to retrieve the metadata and to check if a variant exists based on metadata were added.
The creation, comparison, and serialization processes for AEItemKey now all support metadata.

Available Versions

AEKey Legacy 1.0.5release

MC 1.12.2forge

March 25, 2026

How to Install AEKey Legacy on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set forge Loader

In the panel under "Egg", select the forge loader and matching Minecraft version (1.12.2).

Install Mod

Open the mod browser in the dashboard and search for "AEKey Legacy". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forge

Minecraft Versions

1.12.2

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

AEKey Legacy server crashes on startup – what to do?

Most common cause: wrong forge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.12.2). You can switch loaders with one click in the panel.

Is AEKey Legacy compatible with forge?

AEKey Legacy officially supports forge for Minecraft 1.12.2. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with AEKey Legacy – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if AEKey Legacy consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.