Resilience4j is a fault tolerance library designed for Java8 and functional programming
VAVR (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.
jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams. The JDK 8's main efforts (default methods, lambdas, and the Stream API) were focused around maintaining backwards compatibility and implementing a functional API for parallelism.
Functional patterns for Java
Functional programming in Java
java port of Underscore.js
Code, exercises and solutions from the book "Functional Programming in Java"
Generic, Null-safe, Immutable Collections and Functional Transformations for the JVM