Practical Free monads in Java
higher-kinded-j shows you how to:
• Build composable DSLs
• Transformations as interpreters
• Stack-safe (10k+ ops verified)
• Test effectful code purely
Complete guide:
https://higher-kinded-j.github.io/monads/free_monad.html

Introduction to Higher-Kinded-J - Higher-Kinded-J: Composable Effects and Advanced Optics for Java
The most comprehensive functional programming library for Java. Unify error handling, optional values, and immutable data navigation with the Effect Path API and Focus DSL. Features advanced optics with code generation for Java records, filtered traversals, indexed optics, and seamless Spring Boot integration.

