Eaglercraft runs on a JavaScript (or experimental WebAssembly ) runtime rather than the standard Java Virtual Machine. Because of this architectural difference, mods must be written in to interact with the game's internal API.
If you are getting a black screen or the mod isn't loading, check these common errors: eaglercraft 18 mods work
: This is a dedicated mod loader and fork of Eaglercraft specifically designed to support JavaScript-based mods. eaglercraft 18 mods work
Bukkit/Spigot-like plugins (proxy approach) eaglercraft 18 mods work
Resource & behavior syncing