RainAPI

RainJava API

Advanced Runtime Class Transformation Framework

A foundational library providing Mixin and Coremod interoperability layers, powered by enterprise-grade bytecode and compilation tools.

Overview

RainJava API establishes the critical infrastructure for runtime class transformation pipelines. It serves as a middleware bridge between dynamic compilation workflows and Minecraft’s standard modification systems (Mixin & Coremod), ensuring bytecode-level compatibility without compromising game stability.

While designed as the prerequisite foundation for the upcoming RainJava ecosystem, this API functions independently as a robust toolkit for developers requiring deep class manipulation capabilities.

Embedded Libraries

This mod ships with zero-external-dependency versions of industry-standard tools:

• Javassist — High-level bytecode manipulation library for runtime class engineering

• ECJ (Eclipse Compiler for Java) — Full-featured Java compiler capable of runtime source-to-bytecode transformation

• JavaParser — Abstract Syntax Tree (AST) analysis and code generation framework

These libraries are shaded and isolated to prevent conflicts with other mods.

Technical Scope

• Transformation Bridge — Facilitates communication between runtime-generated class definitions and established bytecode modification frameworks

• Mixin Compatibility Layer — Enables standardized injection patterns to recognize and process dynamically provisioned classes  

• Coremod Integration — Provides stable hooks for runtime class definitions to participate in Forge’s transformation chain

• Sandboxed Execution — Implements security boundaries for runtime code evaluation environments

For Modders

Install this API if you:

• Plan to develop for or use the upcoming RainJava framework

• Require embedded Javassist/ECJ/JavaParser without bundling them yourself

• Need stable Mixin/Coremod interoperability for advanced bytecode operations