New Java Libraries 2026

last commit 6 days ago pmd/pmd 5K +11

added 2 weeks ago

An extensible multilanguage static code analyzer.

Java Code Quality Tools

last commit 2 days ago alibaba/qlexpress 5K +19

added 2 weeks ago

QLExpress is an embedded Java dynamic scripting tool evolved from Alibaba’s e-commerce business rules

Java Scripting Libraries

last commit 3 weeks ago eclipse-collections/eclipse-collections 2K +7

added 2 weeks ago

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

Java Data Structures

last commit 3 days ago unicode-org/icu 3K +22

added 2 weeks ago

ICU it offers superior, standards-compliant, and up-to-date globalization features.

Java Localization Libraries C/C++ Localization Libraries

last commit 1 day ago open-telemetry/opentelemetry-java 2K +12

added 2 weeks ago

OpenTelemetry Java SDK

Java Observability Tools

last commit 8 months ago fusesource/jansi 1K +1

added 3 weeks ago

Jansi is a small java library that allows you to use ANSI escape sequences to format your console output which works even on windows.

Java CLI Libraries

last commit 1 month ago kusoroadeolu/clique 29

added 3 weeks ago

A lightweight Java framework for styling and beautifying terminal output

Java CLI Libraries

last commit 3 weeks ago softwaremill/jox 387

added 3 weeks ago

Virtual-thread based safe concurrency & streaming

Java Concurrency Libraries Kotlin Concurrency Libraries

last commit 3 weeks ago bluuewhale/hash-smith 76

added 3 weeks ago

Fast & memory efficient hash tables for Java

Java Data Structures

last commit 1 month ago mokksy/ai-mocks 33

added 4 weeks ago

AI-Mocks is a Kotlin-based mock server toolkit that brings service virtualization to both HTTP/SSE and LLM APIs — think WireMock meets local OpenAI/Anthropic/Gemini/A2A testing, but with real streaming and Server-Sent Events support.

Java Testing Libraries AI / ML Libraries Integration Testing Libraries Kotlin Testing Libraries AI / ML Libraries Integration Testing Libraries

last commit 5 days ago line/armeria 5K +4

added 1 month ago

Armeria is your go-to microservice framework for any situation. Brought to you by the creator of Netty.

Java Microservices Frameworks

last commit 9 months ago f4b6a3/uuid-creator 622 +1

added 1 month ago

UUID Creator is a Java library for generating Universally Unique Identifiers.

Java ID Generators

last commit 3 days ago spotbugs/spotbugs 3K +7

added 1 month ago

SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.

Java Code Quality Tools

last commit 1 month ago jsendnsca/jsendnsca 14

added 1 month ago

JSend NSCA is Java API for sending passive checks to the Nagios NSCA add-on.

Java Nagios Libraries

last commit 2 months ago gunnarmorling/persistasaurus 34

added 1 month ago

A minimal durable execution library for Java, based on SQLite.

Java State Machine Libraries Workflow Engines