Javassist

Allows editing class files using Java language vocabulary, making bytecode manipulation accessible without learning bytecode specifications, as highlighted in the README.

Provides both source-level and bytecode-level APIs, catering to different expertise levels and enabling fine-grained control when needed, per the project's philosophy.

Enables runtime definition of new classes, essential for implementing aspect-oriented programming (AOP) and dynamic proxies, as stated in the key features.

Compiles source text to bytecode dynamically, simplifying code injection and modification without manual bytecode editing, as described in the README.