Projects

• ArchUnit - 2.0 🟢Test library for specifying and asserting architecture rules.
• jMolecules - 2.0 🟠Annotations and interfaces to express design and architecture concepts in code.
• MapStruct - over-configuration approach.
• ModelMapper - 2.0 🟠Intelligent object mapping library that automatically maps objects to each other.
• reMap - 2.0 🟢Lambda and method handle-based mapping which requires code and not annotations if objects have different names.
• Buck2 - 2.0 🟢Encourages the creation of small, reusable modules consisting of code and resources.
• bytecode-viewer - 3.0 🟢Java 8 Jar & Android APK reverse engineering suite.
• Javassist
• Maker - 2.0 🟢Provides low level bytecode generation.
• Caffeine - 2.0 🟢High-performance, near-optimal caching library.
• jbock
• JLine
• Jansi - 2.0 🟠ANSI escape codes to format console output.
• Lanterna - 3.0 🟢Easy console text-GUI library, similar to curses.
• Checkstyle - 2.1 🟢Static analysis of coding conventions and standards.
• Error Prone - 2.0 🟢Catches common programming mistakes as compile-time errors.
• Error Prone Support
• Infer
• NullAway - time overhead.
• PMD
• SonarJava - 3.0-only)
• Spoon
• Spotbugs - 2.1 🟢Static analysis of bytecode to find potential bugs.
• Auto - 2.0 🟢Generates factory, service, and value classes.
• Geci - 2.0 🟠Discovers files that need generated code, updates automatically and writes to the source with a convenient API.
• JHipster - 2.0 🟢Yeoman source code generator for Spring Boot and AngularJS.
• Record-Builder - 2.0 🟢Companion builder class, withers and templates for Java records.
• JavaCV
• centraldogma - 2.0 🟢Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2.
• config
• Configurate - 2.0 🟢Configuration library with support for various configuration formats and transformations.
• dotenv - factor configuration library which uses environment-specific files.
• Externalized Properties - 2.0 🟢Simple, lightweight, yet powerful configuration library which supports resolution of properties from external sources such as files, databases, git repositories, and any custom sources, plus an extensible post-processing/conversion mechanism.
• Gestalt - 2.0 🟢Gestalt offers a comprehensive solution to the challenges of configuration management. It allows you to source configuration data from multiple inputs, merge them intelligently, and present them in a structured, type-safe manner.
• LangChain4j - 2.0 🟢Simplifies integration of LLMs with unified APIs and a comprehensive toolbox.
• MCP Java SDK
• Google Cloud Client Libraries - 2.0 🟢Client libraries for accessing Google Cloud services from Java applications.
• simple-openai
• EasyEntityToDTO
• JSpecify Package-Info Generator - 2.0 🟠Maven plugin that automatically generates package-info.java files with JSpecify annotations (@NullMarked and @NullUnmarked), helping you manage nullness boundaries in your Java projects without manual boilerplate.
• RefactorFirst - 2.0 🟢Identifies and prioritizes God Classes and Highly Coupled classes.
• KAConf - 2.0 🔴Annotation-based configuration system for Java and Kotlin.
• JaCoP - 3.0)
• FastCSV - optimized, dependency-free and RFC 4180 compliant.
• Persistent Collection
• Protobuf
• RoaringBitmap - 2.0 🟢Fast and efficient compressed bitmap.
• Wire - 2.0 🟢Clean, lightweight protocol buffers.
• ArangoDB - 2.0 🟢ArangoDB Java driver.
• Chronicle Map - 2.0 🟢Efficient, in-memory (opt. persisted to disk), off-heap key-value store.
• eXist - 2.1 🟢NoSQL document database and application platform.
• FlexyPool - 2.0 🟠Brings metrics and failover strategies to the most common connection pooling solutions.
• HikariCP - 2.0 🟠High-performance JDBC connection pool.
• Jinq
• MariaDB4j - 2.0 🟢Launcher for MariaDB that requires no installation or external dependencies.
• Modality - 2.0 🟢Lightweight ORM with database reverse engineering features.
• OpenDJ
• QueryStream - 2.0 🔴Build JPA Criteria queries using a Stream-like API.
• QuestDB - 2.0 🟢High-performance SQL database for time series. Supports InfluxDB line protocol, PostgreSQL wire protocol, and REST.
• Realm - 2.0 🔴Mobile database to run directly inside phones, tablets or wearables.
• Redisson - 2.0 🟢Allows for distributed and scalable data structures on top of a Redis server.
• requery - 2.0 🟠Modern, lightweight but powerful object mapping and SQL generator. Easily map to or create databases, or perform queries and updates from any Java-using platform.
• Spring Data JPA MongoDB Expressions - 2.0 🟠Allows you to use MongoDB query language to query your relational database.
• Xodus - 2.0 🟢Highly concurrent transactional schema-less and ACID-compliant embedded database.
• CosId - 2.0 🟢Universal, flexible, high-performance distributed ID generator.
• Apache ShardingSphere - 2.0 🟢Distributed SQL transaction & query engine that allows for data sharding, scaling, encryption, and more on any database.
• iCal4j - 3-Clause 🟢Parse and build iCalendar 🌎 RFC 5545 data models.
• ThreeTen-Extra - 3-Clause 🟢Additional date-time classes that complement those in JDK 8.
• Time4J - 2.1 🔴Advanced date and time library.
• java-tron - 3.0 🟢Implementation of the Tron Protocol, whic utilizes blockchains to develop decentralized applications.
• Governator - 2.0 🟠Extensions and utilities that enhance Google Guice.
• Guice - 2.0 🟢Lightweight and opinionated framework that completes Dagger.
• Faux Pas
• HotswapAgent - 2.0 🟢Unlimited runtime class and resource redefinition.
• JavaParser
• Manifold - 2.0 🟢Re-energizes Java with powerful features like type-safe metaprogramming, structural typing and extension methods.
• SneakyThrow
• Dropwizard Circuit Breaker - 2.0 🟠Circuit breaker design pattern for Dropwizard.
• Hazelcast - memory datagrid with a free open-source version.
• resilience4j - 2.0 🟢Functional fault tolerance library.
• OpenIG - performance reverse proxy server with specialized session management and credential replay functionality.
• ScaleCube Services - 2.0 🟢Embeddable Cluster-Membership library based on SWIM and gossip protocol.
• Zuul - 2.0 🟢Gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
• Artipie
• Getdown - user computers and keeping them up to date. Developed as an alternative to Java Web Start.
• JavaPackager - 3.0 🟠Maven and Gradle plugin which provides an easy way to package Java applications in native Windows, macOS or GNU/Linux executables, and generate installers for them.
• jlink.online - 2.0 🟢Builds optimized runtimes over HTTP.
• packr - 2.0 🔴Packs JARs, assets and the JVM for native distribution on Windows, Linux and macOS.
• really-executable-jars-maven-plugin - 2.0 🟠Maven plugin for making self-executing JARs.
• fastexcel
• zerocell - 2.0 🔴Annotation-based API for reading data from Excel sheets into POJOs with focus on reduced overhead.
• Cassandre - 3.0 🔴Trading bot framework.
• Philadelphia - 2.0 🟢Low-latency financial information exchange.
• Stripe
• ta4j
• Java Path Finder (JPF)
• jOOλ - 2.0 🔴Extension to Java 8 that aims to fix gaps in lambda by providing numerous missing types and a rich set of sequential Stream API additions.
• Packrat - 2.0 🟢Gatherers library for Java Stream API. Gatherers can enhance streams with custom intermediate operations.
• protonpack
• StreamEx - 2.0 🟢Enhances Java 8 Streams.
• vulkan4j - 3-Clause 🔴Vulkan, OpenGL ES2 and GLFW Memory Allocator bindings.
• Geo - 2.0 🟢GeoHash utilities in Java.
• GraphHopper - 2.0 🟢Road-routing engine. Used as a Java library or standalone web service.
• Mapsforge - 3.0 🟢Map rendering based on OpenStreetMap data.
• Spatial4j - purpose spatial/geospatial library.
• SnapKit
• JCTools - 2.0 🟢Concurrency tools currently missing from the JDK.
• Async Http Client - 2.0 🟢Asynchronous HTTP and WebSocket client library.
• Feign - 2.0 🟢HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.
• Google HTTP Client - 2.0 🟢Pluggable HTTP transport abstraction with support for java.net.HttpURLConnection, Apache HTTP Client, Android, Google App Engine, XML, Gson, Jackson and Protobuf.
• methanol
• Ribbon - 2.0 🟠Client-side IPC library that is battle-tested in the cloud.
• Riptide - side response routing for Spring's RestTemplate.
• unirest-java
• hate - friendly objects according to HAL specification.
• Spring HATEOAS - 2.0 🟢Standalone and Spring support for building hypermedia-based APIs using HAL, HAL FORMS, Collection+JSON, ALPS and UBER.
• Barcode-Lib4J - 2.0 🟢Generates QR Code, DataMatrix, and other 1D/2D barcodes as vector (PDF, EPS, SVG) and raster (PNG, BMP, JPG) images with DPI awareness, high precision, and CMYK color model support.
• Imgscalr - 2.0 🔴Simple, efficient and hardware-accelerated image-scaling library implemented in pure Java 2D.
• Tess4J - 2.0 🟢JNA wrapper for Tesseract OCR API.
• Thumbnailator - quality thumbnail generation library.
• TwelveMonkeys - 3-Clause 🟢Collection of plugins that extend the number of supported image file formats.
• ZXing - 2.0 🟢Multi-format 1D/2D barcode image processing library.
• image-comparison - 2.0 🟢Library that compares 2 images with the same sizes and shows the differences visually by drawing rectangles. Some parts of the image can be excluded from the comparison.
• vips-ffm - 2.0 🟢Comprehensive bindings for libvips, using Java's "Foreign Function & Memory" API.
• ClassGraph - fast, ultra-lightweight, parallelized classpath scanner and module scanner for Java, Scala, Kotlin and other JVM languages.
• jOOR - 2.0 🔴jOOR stands for jOOR Object Oriented Reflection. It is a simple wrapper for the java.lang.reflect package.
• ReflectASM - 3-Clause 🔴ReflectASM is a very small Java library that provides high performance reflection by using code generation.
• JobRunr - and-forget, delayed and recurring jobs. Guarantees execution by single scheduler instance using optimistic locking. Has features for persistence, minimal dependencies and is embeddable.
• Quartz - 2.0 🟢Feature-rich, open source job scheduling library that can be integrated within virtually any Java application.
• Sundial - 2.0 🟠Lightweight framework to simply define jobs, define triggers and start the scheduler.
• Wisp - 2.0 🟠Simple library with minimal footprint and straightforward API.
• db-scheduler - 2.0 🟢Persistent and cluster-friendly scheduler.
• easy-batch
• shedlock - 2.0 🟢Makes sure that your scheduled tasks are executed at most once at the same time. If a task is being executed on one node, it acquires a lock which prevents execution of the same task from another node or thread.
• DSL-JSON - 3-Clause 🟢JSON library with advanced compile time databinding.
• Gson - 2.0 🟢Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.
• jackson-modules-java8 - 2.0 🟢Set of Jackson modules for Java 8 datatypes and features.
• Jackson
• JSON-io - 2.0 🟢Convert Java to JSON/TOON and back. Supports complex object graphs, cyclic references, and TOON format for 40-50% LLM token savings.
• Moshi - 2.0 🟢Modern JSON library, less opinionated and uses built-in types like List and Map.
• Yasson
• Jolt - 2.0 🟢JSON to JSON transformation tool.
• JsonPath - 2.0 🟠Extract data from JSON using XPATH-like syntax.
• Graal - 2.0-only WITH Classpath-exception-2.0)
• Microsoft JDK
• Echopraxia - free, meaning it can be implemented with any logging API.
• Logbook - source library for HTTP request and response logging.
• JSAT - 3.0 🔴Algorithms for pre-processing, classification, regression, and clustering with support for multi-threaded execution.
• Neureka - array/tensor library.
• Siddhi - 2.0 🟠Cloud native streaming and complex event processing engine.
• Smile
• JeroMQ - 2.0 🟠Implementation of ZeroMQ.
• RabbitMQ Java client
• Smack - 2.0 🟢Cross-platform XMPP client library.
• NATS client - 2.0 🟢NATS client.
• Armeria - 2.0 🟢Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.
• Eureka - 2.0 🟢REST-based service registry for resilient load balancing and failover.
• kubernetes-client - 2.0 🟢Client provides access to the full Kubernetes & OpenShift REST APIs via a fluent DSL.
• Sentinel - 2.0 🟠Flow control component enabling reliability, resilience and monitoring for microservices.
• FF4J - 2.0 🟢Feature Flags for Java.
• IP2Location.io Java SDK
• ISBN core - 10 and ISBN-13 and tools to parse, validate and format one.
• J2ObjC - to-Objective-C translator for porting Android libraries to iOS.
• JBot - 3.0 🟠Framework for building chatbots.
• JEmoji - 2.0 🟢An auto-generated emoji library that provides type-safe direct access to emojis and alias support for Discord, Slack, GitHub and many more features.
• Jimfs - 2.0 🟢In-memory file system.
• MinimalFTP - 2.0 🔴Lightweight, small and customizable FTP server.
• Modernizer - 2.0 🟢Detect uses of legacy Java APIs.
• PipelinR
• Polyglot for Maven - 1.0 🟢Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
• RR4J - 3.0 🔴RR4J is a tool that records java bytecode execution and later allows developers to replay locally.
• Simple Java Mail - 2.0 🟢Mailing with a clean and fluent API.
• Smooks - based message processing. (Apache-2.0 OR LGPL-3.0-or-later)
• Svix
• TypeTools - 2.0 🔴Tools for resolving generic types.
• webcam-capture - in and external webcams directly in Java.
• XMLBeam - 2.0 🔴Processes XML by using annotations or XPath within code.
• yGuard
• Apitally - focused API monitoring, analytics and request logging for Spring Boot apps.
• Automon - 2.0 🔴Combines the power of AOP with monitoring and/or logging tools.
• Datadog - 2.0 🟢Modern monitoring & analytics.
• Dropwizard Metrics - 2.0 🟢Expose metrics via JMX or HTTP and send them to a database.
• HertzBeat - 2.0 🟢Real-time monitoring system with custom-monitor and agentless.
• hippo4j - 2.0 🟠Dynamic and observable thread pool framework.
• JavaMelody - 2.0 🟢Performance monitoring and profiling.
• Micrometer - 2.0 🟢Vendor-neutral metrics/observability facade for the most popular metrics/observability libraries.
• Micrometer Tracing - 2.0 🟢Vendor-neutral distributed tracing facade for the most popular tracer libraries.
• OpenTelemetry - 2.0 🟢Instrument, generate, collect, and export telemetry data to help you analyze your software’s performance and behavior.
• Prometheus - 2.0 🟢Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.
• Sentry
• SPM - 2.0 🟢Performance monitor with distributing transaction tracing for JVM apps.
• JavaCPP
• JNA
• JNR
• native-lib-loader
• Hypherator - like interface. Can be used out-of-the box - dictionaries for multiple languages are bundled in.
• Commons-networking - 2.0 🔴Client for server-sent events (SSE).
• Dubbo - 2.0 🟢High-performance RPC framework.
• gRPC-java - 2.0 🟢RPC framework based on protobuf and HTTP/2.
• Drift - 2.0 🟢Easy-to-use, annotation-based library for creating Thrift clients and serializable types.