JDK main-line development https://openjdk.org/projects/jdk

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

A high performance caching library for Java

Quarkus: Supersonic Subatomic Java.

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google.

🔎 Open source distributed and RESTful search engine.

A configuration as code language with rich validation and tooling.

Resilience4j is a fault tolerance library designed for Java8 and functional programming

A damn simple library for building production-ready RESTful web services.

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

An annotation processor for generating type-safe bean mappers

Micronaut Application Framework

Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …

A blazingly fast multi-language serialization framework powered by JIT and zero-copy.

An extremely easy way to perform background processing in Java. Backed by persistent storage. Open and free for commercial use.

Smithy is a protocol-agnostic interface definition language and set of tools for generating clients, servers, and documentation for any programming language.

The Jdbi library provides convenient, idiomatic access to relational databases in Java and other JVM technologies such as Kotlin, Clojure or Scala.

An extensible Java library for HTTP request and response logging

📦 Gradle/Maven plugin to package Java applications as native Windows, MacOS, or Linux executables and create installers for them.

Native JVM WebAssembly runtime

A Java library that implements application/problem+json

A simple expressive web framework for java. Original Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin