immutable

The most advanced ORM of JVM, for both java & kotlin

The Capsule Hash Trie Collections Library

Persian Date Time

immutable-xjc is a JAXB 4.0 XJC plugin for making schema derived classes immutable with optional builder pattern generator.

Efficient Immutable/Persistent Collections for Java

Purely functional data structures in Java

Primitive Java Immutable Collections, like Array, ArraySet, etc.

View-data binding library for Android.

Optics-based DSL for Java records and POJOs. One type for deep navigation, immutable update, bidirectional mapping, and effects across records + plain POJOs + Lombok. Optional compile-time codegen.

Execute console commands and scripts from Java easily

Read-only primitive Java arrays backed by Direct Buffers and indexed using 64-bit indexes

Lens generation for Java Records

Truly immutable collections, functional errors handling, laziness, and measurement utilities

Performant copy-on-write collections on the jvm

Strongly typed tuple library for java - immutable and mutable implementations

Sapling template multi-module application using spring boot in gradle. Has advanced configuration pre-built for development and testing.

Honeycomb cells for building regular expressions in a fluent way

An annotation processor to easily generate implementations of complex, immutable fluent apis

Immuto - Java Records-first object mapper.An annotation processor generates type-safe mapper implementations at compile time; the generated code calls each target record's canonical constructor directly - zero runtime reflection, sealed class support, full Java 21+ idioms.

Cons List: a production-grade immutable collection for use in recursive algorithms