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Dev tools · October 18, 2015

Derive4j – Java8 support for ADTs, pattern matching, and more

Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses. - derive4j/derive4j

Derive4j – Java8 support for ADTs, pattern matching, and more launched on October 18, 2015 with 10 votes, #2,052 of 4,175 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 11 years on.

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In plain words

Derive4j is a Java 8 annotation processor that automatically generates code for algebraic data types, including constructors, pattern matching, folds, optics, and typeclasses. It targets Java developers who want functional programming patterns without manual boilerplate. The tool reduces repetitive code generation by leveraging annotations to derive common operations for data types.

written from the facts on this page · September 2026

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