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Awesome Java Awesome

A curated list of awesome Java frameworks, libraries and software.

Contents

Projects

Bean Mapping

Frameworks that ease bean mapping.

  •   1700 MapStruct - Code generator that simplifies mappings between different bean types, based on a convention-over-configuration approach.
  •   1414 Dozer - Mapper that copies data from one object to another using annotations and API or XML configuration.
  •   1081 ModelMapper - Intelligent object mapping library that automatically maps objects to each other.
  •    732 Orika - JavaBean-mapping framework that recursively copies (among other capabilities) data from one object to another.
  •    177 Selma - Annotation processor-based bean mapper.
  •     26 dOOv - Provides fluent API for typesafe domain model validation and mapping. It uses annotations, code generation and a type safe DSL to make bean validation and mapping fast and easy.
  •      0 JMapper - Uses byte code manipulation for lightning-fast mapping. Supports annotations and API or XML configuration.

Build

Tools that handle the build cycle and dependencies of an application.

  •  11806 Bazel - Tool from Google that builds code quickly and reliably.
  •   8844 Gradle - Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.
  •   6657 Buck - Encourages the creation of small, reusable modules consisting of code and resources.
  •     27 Apache Maven - Declarative build and dependency management that favors convention over configuration. It might be preferable to Apache Ant, which uses a rather procedural approach and can be difficult to maintain.

Bytecode Manipulation

Libraries to manipulate bytecode programmatically.

  •  10062 bytecode-viewer - Java 8 Jar & Android APK reverse engineering suite.
  •   2766 cglib - Bytecode generation library.
  •   2732 Byte Buddy - Further simplifies bytecode generation with a fluent API.
  •    330 Byteman - Manipulate bytecode at runtime via DSL (rules); mainly for testing/troubleshooting.
  •    244 Mixin - Manipulate bytecode at runtime using real Java code.
  •      0 Javassist - Tries to simplify bytecode editing.

Caching

Libraries that provide caching facilities.

  •   5806 Caffeine - High-performance, near-optimal caching library.
  •   1288 Ehcache - Distributed general-purpose cache.
  •    339 cache2k - In-memory high performance caching library.
  •      0 Infinispan - Highly concurrent key/value datastore used for caching.

CLI

Libraries for everything related to the CLI.

  •   1260 JCommander - Command-line argument-parsing framework with custom types and validation via implementing interfaces.
  •   1200 picocli - ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.
  •   1143 Lanterna - Easy console text-GUI library, similar to curses.
  •    734 Airline - Annotation-based framework for parsing Git-like command-line arguments.
  •    641 args4j - Small library to parse command-line arguments.
  •    627 Jansi - ANSI escape codes to format console output.
  •    449 JLine - Includes features from modern shells like completion or history.
  •    179 ASCII Table - Library to draw tables in ASCII.
  •    151 Text-IO - Aids the creation of full console-based applications.
  •     56 Java ASCII Render - Graphical primitives for the console.
  •     20 jbock - Typesafe, reflection-free, annotation based command-line parser
  •      0 JOpt Simple - Fluent parser that uses the POSIX#getopt and GNU#getopt_long syntaxes.

Cluster Management

Frameworks that can dynamically manage applications inside of a cluster.

  •     96 Singularity - Mesos framework that makes deployment and operations easy. It supports web services, background workers, scheduled jobs, and one-off tasks.
  •      0 Apache Aurora - Mesos framework for long-running services and cron jobs.
  •      0 Apache Mesos - Abstracts CPU, memory, storage, and other compute resources away from machines.

Code Analysis

Tools that provide metrics and quality measurements.

  •   9731 Infer - Modern static analysis tool for verifying the correctness of code.
  •   4662 Error Prone - Catches common programming mistakes as compile-time errors.
  •   4505 Checkstyle - Static analysis of coding conventions and standards.
  •   2504 NullAway - Eliminates NullPointerExceptions with low build-time overhead.
  •   2256 PMD - Source code analysis for finding bad coding practices.
  •   1268 Spotbugs - Static analysis of bytecode to find potential bugs.
  •    725 Spoon - Library for analyzing and transforming Java source code.
  •    488 SonarJava - Static analyzer for SonarQube & SonarLint.
  •    136 jQAssistant - Static code analysis with Neo4J-based query language.
  •      0 Sourcetrail c - Visual source code navigator.

Code Coverage

Frameworks and tools that enable code coverage metrics collection for test suites.

  •      0 Clover c - Relies on source-code instrumentation instead of bytecode instrumentation.
  •      0 JaCoCo - Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation.
  •      0 Cobertura - Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics.

Code Generators

Tools that generate patterns for repetitive code in order to reduce verbosity and error-proneness.

  •  13464 JHipster - Yeoman source code generator for Spring Boot and AngularJS.
  •   7731 Auto - Generates factory, service, and value classes.
  •   7705 Lombok - Code generator that aims to reduce verbosity.
  •   6809 JavaPoet - API to generate source files.
  •   2367 Immutables - Annotation processors to generate simple, safe and consistent value objects.
  •    715 FreeBuilder - Automatically generates the Builder pattern.
  •    119 ADT4J - JSR-269 code generator for algebraic data types.
  •    118 Joda-Beans - Small framework that adds queryable properties to Java, enhancing JavaBeans.

Compiler-compiler

Frameworks that help to create parsers, interpreters or compilers.

  •   5560 ANTLR - Complex full-featured framework for top-down parsing.
  •    256 JFlex - A lexical analyzer generator.
  •      0 JavaCC - Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.

Configuration

Libraries that provide external configuration.

  •   4250 config - Configuration library for JVM languages.
  •    666 owner - Reduces boilerplate of properties.
  •    467 cfg4j - Modern configuration library for distributed apps written in Java.
  •    251 centraldogma - Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2.
  •     33 KAConf - Annotation-based configuration system for Java and Kotlin.
  •     23 dotenv - A twelve-factor configuration library for Java.
  •      0 ini4j - Provides an API for handling Windows' INI files.

Constraint Satisfaction Problem Solver

Libraries that help with implementing optimization and satisfiability problems.

  •   1229 OptaPlanner - Business planning and resource scheduling optimization solver.
  •    393 Choco - Off-the-shelf constraint satisfaction problem solver that uses constraint programming techniques.
  •    145 JaCoP - Includes an interface for the FlatZinc language, enabling it to execute MiniZinc models.

CSV

Frameworks and libraries that simplify reading/writing CSV data.

  •    626 uniVocity-parsers - One of the fastest and most feature-complete parsers. Also comes with parsers for TSV and fixed-width records.
  •    190 jackson-dataformat-csv - Jackson extension for reading and writing CSV.
  •      0 opencsv - Simple CSV parser.
  •      0 Super CSV - Powerful CSV parser with support for Dozer, Joda-Time and Java 8.

Database

Everything that simplifies interactions with the database.

  •  10418 Realm - Mobile database to run directly inside phones, tablets or wearables.
  •   9811 HikariCP - High-performance JDBC connection pool.
  •   8984 Presto - Distributed SQL query engine for big data.
  •   8940 Redisson - Allows for distributed and scalable data structures on top of a Redis server.
  •   7995 Jedis - Small client for interaction with Redis, with methods for commands.
  •   7982 druid - High-performance, column-oriented, distributed data store.
  •   4031 Flyway - Simple database migration tool.
  •   3830 OrientDB - Embeddable distributed database written on top of Hazelcast.
  •   3012 jOOQ - Generates typesafe code based on SQL schema.
  •   2793 requery - A 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.
  •   2272 Querydsl - Typesafe unified queries.
  •   1655 Speedment - Database access library that utilizes Java 8's Stream API for querying.
  •   1645 Chronicle Map - Efficient, in-memory (opt. persisted to disk), off-heap key-value store.
  •   1610 Jest - Client for the Elasticsearch REST API.
  •    854 sql2o - Thin JDBC wrapper that simplifies database access and provides simple mapping of ResultSets to POJOs.
  •    678 FlexyPool - Brings metrics and failover strategies to the most common connection pooling solutions.
  •    532 Jinq - Typesafe database queries via symbolic execution of Java 8 Lambdas (on top of JPA or jOOQ).
  •    395 MariaDB4j - Launcher for MariaDB that requires no installation or external dependencies.
  •    385 jasync-sql - Async DB driver for MySQL and PostgreSQL.
  •    349 JDBI - Convenient abstraction of JDBC.
  •    237 eXist - A NoSQL document database and application platform.
  •    132 AranoDB - ArangoDB Java driver.
  •    131 jetcd - Client library for etcd.
  •     71 Vibur DBCP - JDBC connection pool library with advanced performance monitoring capabilities.
  •     28 Liquibase - Database-independent library for tracking, managing and applying database schema changes.
  •      0 Apache Phoenix - High-performance relational database layer over HBase for low-latency applications.
  •      0 MapDB - Embedded database engine that provides concurrent collections backed on disk or in off-heap memory.
  •      0 H2 - Small SQL database notable for its in-memory functionality.
  •      0 Xodus - Highly concurrent transactional schema-less and ACID-compliant embedded database.

Data Structures

Efficient and specific data structures.

  •  33888 Protobuf - Google's data interchange format.
  •   6207 Apache Thrift - Data interchange format that originated at Facebook.
  •   2747 Wire - Clean, lightweight protocol buffers.
  •   2283 Tape - A lightning-fast, transactional, file-based FIFO.
  •   1867 SBE - Simple Binary Encoding, one of the fastest message formats around.
  •    819 Apache Parquet - Columnar storage format based on assembly algorithms from Google's paper on Dremel.
  •    557 Persistent Collection - Persistent and immutable analogue of the Java Collections Framework.
  •    335 Big Queue - A big, fast and persistent queue based on memory-mapped files.
  •     18 HyperMinHash-java - Probabilistic data structure for computing union, intersection, and set cardinality in loglog space.
  •      0 Apache Avro - Data interchange format with dynamic typing, untagged data, and absence of manually assigned IDs.
  •      0 Apache Orc - Fast and efficient columnar storage format for Hadoop-based workloads.

Date and Time

Libraries related to handling date and time.

  •    358 iCal4j - Parse and build iCalendar RFC 5545 data models.
  •    242 Time4J - Advanced date and time library.
  •    205 ThreeTen-Extra - Additional date-time classes that complement those in JDK 8.
  •     20 Almanac Converter - Simple conversion between different calendar systems.

Dependency Injection

Libraries that help to realize the Inversion of Control paradigm.

  •   8029 Guice - Lightweight and opinionated framework that completes Dagger.
  •    711 Governator - Extensions and utilities that enhance Google Guice.
  •    292 Feather - Ultra-lightweight, JSR-330-compliant dependency injection library.
  •     42 JayWire - Lightweight dependency injection framework.
  •      0 Apache DeltaSpike - CDI extension framework.
  •      0 Dagger2 - Compile-time injection framework without reflection.
  •      0 HK2 - Lightweight and dynamic dependency injection framework.

Development

Augmentation of the development process at a fundamental level.

  •   2440 JavaParser - Parse, modify and generate Java code.
  •   1251 HotswapAgent - Unlimited runtime class and resource redefinition.
  •    249 JavaSymbolSolver - A symbol solver for Java.
  •     79 NoException - Allows checked exceptions in functional interfaces and converts exceptions to Optional return.
  •     71 Faux Pas - Library that simplifies error handling by circumventing the issue that none of the functional interfaces in the Java Runtime is allowed by default to throw checked exceptions.
  •     41 SneakyThrow - Ignores checked exceptions without bytecode manipulation. Can also be used inside Java 8 stream operations.
  •      1 DCEVM - JVM modification that allows unlimited redefinition of loaded classes at runtime.
  •      0 AspectJ - Seamless aspect-oriented programming extension.
  •      0 JRebel c - Instantly reloads code and configuration changes without redeploys.

Distributed Applications

Libraries and frameworks for writing distributed and fault-tolerant applications.

  •  17172 Hystrix - Provides latency and fault tolerance.
  •   7385 Zuul - A gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
  •   3537 Quasar - Lightweight threads and actors for the JVM.
  •   3448 resilience4j - Functional fault tolerance library.
  •   3077 Hazelcast c - Highly scalable in-memory datagrid with a free open-source version.
  •   2798 Failsafe - Simple failure handling with retries and circuit breakers.
  •   1528 Apache Geode - In-memory data management system that provides reliable asynchronous event notifications and guaranteed message delivery.
  •   1372 Orbit - Virtual actors; adds another level of abstraction to traditional actors.
  •    238 ScaleCube - Embeddable Cluster-Membership library based on SWIM and gossip protocol.
  •     35 Dropwizard Circuit Breaker - Circuit breaker design pattern for Dropwizard.
  •      0 JGroups - Toolkit for reliable messaging and cluster creation.
  •      0 Apache ZooKeeper - Coordination service with distributed configuration, synchronization, and naming registry for large distributed systems.
  •      0 Apache Storm - Realtime computation system.
  •      0 Axon Framework - Framework for creating CQRS applications.
  •      0 Atomix - Fault-tolerant distributed coordination framework.

Distributed Transactions

Distributed transactions provide a mechanism for ensuring consistency of data updates in the presence of concurrent access and partial failures.

  •    331 Bitronix - A simple but complete implementation of the JTA 1.1 API.
  •      0 Atomikos - Provides transactions for REST, SOA and microservices with support for JTA and XA.
  •      0 Narayana - Provides support for traditional ACID and compensation transactions, also complies with JTA, JTS and other standards.

Distribution

Tools that handle the distribution of applications in native formats.

  •   1916 packr - Packs JARs, assets and the JVM for native distribution on Windows, Linux and Mac OS X.
  •   1618 JitPack - Easy-to-use package repository for GitHub. Builds Maven/Gradle projects on demand and publishes ready-to-use packages.
  •   1125 Capsule - Simple and powerful packaging and deployment. A fat JAR on steroids, or a "Docker for Java" that supports JVM-optimized containers.
  •     87 really-executable-jars-maven-plugin - Maven plugin for making self-executing JARs.
  •      0 Boxfuse - Deployment of JVM applications to AWS using the principles of immutable infrastructure.
  •      0 Cloudsmith c - Fully managed package management SaaS with support for Maven/Gradle/SBT.
  •      0 IzPack - Setup authoring tool for cross-platform deployments.
  •      0 Bintray c - Version control for binaries that handle publishing. Compatible with Maven or Gradle, with a free plan for open-source software as well as several business plans.
  •      0 Nexus c - Binary management with proxy and caching capabilities.
  •      0 Central Repository - Largest binary component repository available as a free service to the open-source community. Default used by Apache Maven, and available in all other build tools.

Document Processing

Libraries that assist with processing office document formats.

  •   1127 docx4j - Create and manipulate Microsoft Open XML files.
  •    213 documents4j - API for document format conversion using third-party converters such as MS Word.
  •     23 zerocell - Annotation-based API for reading data from Excel sheets into POJOs with focus on reduced overhead.
  •      0 Apache POI - Supports OOXML (XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT).

Formal Verification

Formal-methods tools: proof assistants, model checking, symbolic execution, etc.

  •     66 CATG - Concolic unit testing engine. Automatically generates unit tests using formal methods.
  •     58 OpenJML - Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers.
  •     15 Checker Framework - Pluggable type systems. Includes nullness types, physical units, immutability types and more.
  •      0 Daikon - Detects likely program invariants and generates JML specs based on those invariants.
  •      0 Java Path Finder (JPF) - JVM formal verification tool containing a model checker and more. Created by NASA.
  •      0 JMLOK 2.0 - Detects inconsistencies between code and JML specification through feedback-directed random tests generation, and suggests a likely cause for each nonconformance detected.
  •      0 KeY - Formal software development tool that aims to integrate design, implementation, formal specification, and formal verification of object-oriented software as seamlessly as possible. Uses JML for specification and symbolic execution for verification.

Functional Programming

Libraries that facilitate functional programming.

  •   3135 Vavr - Functional component library that provides persistent data types and functional control structures.
  •   1452 jOOλ - 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.
  •   1100 StreamEx - Enhances Java 8 Streams.
  •    922 cyclops-react - Monad and stream utilities, comprehensions, pattern matching, functional extensions for all JDK collections, future streams, trampolines and much more.
  •    431 derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching and morphisms.
  •    373 protonpack - Collection of stream utilities.
  •      0 Fugue - Functional extensions to Guava.
  •      0 Functional Java - Implements numerous basic and advanced programming abstractions that assist composition-oriented development.

Game Development

Frameworks that support the development of games.

  •  15294 libGDX - All-round cross-platform, high-level framework.
  •    182 jMonkeyEngine - Game engine for modern 3D development.
  •      0 LWJGL - Robust framework that abstracts libraries like OpenGL/CL/AL.
  •      0 FXGL - JavaFX Game Development Framework.

Geospatial

Libraries for working with geospatial data and algorithms.

  •   2028 GraphHopper - Road-routing engine. Used as a Java library or standalone web service.
  •    736 GeoTools - Library that provides tools for geospatial data.
  •    704 Mapsforge - Map rendering based on OpenStreetMap data.
  •    573 Spatial4j - General-purpose spatial/geospatial library.
  •    280 Geo - GeoHash utilities in Java.
  •     99 H2GIS - A spatial extension of the H2 database.
  •      0 Apache SIS - Library for developing geospatial applications.
  •      0 Geotoolkit.org - Library for developing geospatial applications. Built on top of the Apache SIS project.
  •      0 Jgeohash - Library for using the GeoHash algorithm.

GUI

Libraries to create modern graphical user interfaces.

  •      0 JavaFX - The successor of Swing.
  •      0 Scene Builder - Visual layout tool for JavaFX applications.
  •      0 SWT - The Standard Widget Toolkit, a graphical widget toolkit.

High Performance

Everything about high-performance computation, from collections to specific libraries.

  •   1885 JCTools - Concurrency tools currently missing from the JDK.
  •   1390 Agrona - Data structures and utility methods that are common in high-performance applications.
  •   1046 Eclipse Collections - Collections framework inspired by Smalltalk.
  •    818 Koloboke - Hash sets and hash maps.
  •    581 HPPC - Primitive collections.
  •      0 fastutil - Fast and compact type-specific collections.
  •      0 Disruptor - Inter-thread messaging library.

HTTP Clients

Libraries that assist with creating HTTP requests and/or binding responses.

  •   4956 Async Http Client - Asynchronous HTTP and WebSocket client library.
  •   4307 Feign - HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.
  •   2883 Ribbon - Client-side IPC library that is battle-tested in cloud.
  •    167 Play WS - Typesafe client with reactive streams and caching.
  •    112 restQL-core - Microservice query language that fetches information from multiple services.
  •     96 Riptide - Client-side response routing for Spring's RestTemplate.
  •      0 OkHttp - HTTP+SPDY client.
  •      0 Retrofit - Typesafe REST client.

Hypermedia Types

Libraries that handle serialization to hypermedia types.

  •    272 JSON-LD - JSON-LD implementation.
  •     20 Siren4J - Library for the Siren specification.

IDE

Integrated development environments that try to simplify several aspects of development.

  •   2102 Visual Studio Code - Provides Java support for lightweight projects with a simple, modern workflow by using extensions from the internal marketplace.
  •      0 Eclipse - Established open-source project with support for lots of plugins and languages.
  •      0 IntelliJ IDEA c - Supports many JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector.
  •      0 NetBeans - Provides integration for several Java SE and EE features, from database access to HTML5.

Imagery

Libraries that assist with the creation, evaluation or manipulation of graphical images.

  •  22355 ZXing - Multi-format 1D/2D barcode image processing library.
  •   2203 Thumbnailator - High-quality thumbnail generation library.
  •    959 Imgscalr - Simple, efficient and hardware-accelerated image-scaling library implemented in pure Java 2D.
  •    872 TwelveMonkeys - Collection of plugins that extend the number of supported image file formats.
  •    633 Tess4J - A JNA wrapper for Tesseract OCR API.

JSON

Libraries for serializing and deserializing JSON to and from Java objects.

  •  15451 Gson - Serializes objects to JSON and vice versa. Good performance with on-the-fly usage.
  •   5031 Moshi - Modern JSON library, less opinionated and uses built-in types like List and Map.
  •   4675 Jackson - Similar to GSON, but offers performance gains if you need to instantiate the library more often.
  •   3198 LoganSquare - JSON parsing and serializing library based on Jackson's streaming API. Outperforms GSON & Jackson's library.
  •   1096 jsoniter - Fast and flexible library with iterator and lazy parsing API.
  •    484 DSL-JSON - JSON library with advanced compile time databinding.
  •    298 HikariJSON - High-performance JSON parser, 2x faster than Jackson.
  •    236 JSON-io - Convert Java to JSON. Convert JSON to Java. Pretty print JSON. Java JSON serializer.
  •    198 jackson-modules-java8 - Set of Jackson modules for Java 8 datatypes and features.
  •    109 Yasson - Binding layer between classes and JSON documents similar to JAXB.
  •    104 Jackson-datatype-money - Open-source Jackson module to support JSON serialization and deserialization of JavaMoney data types.
  •      0 Genson - Powerful and easy-to-use Java-to-JSON conversion library.

JSON Processing

Libraries for processing data in JSON format.

  •  17588 fastjson - Very fast processor with no additional dependencies and full data binding.
  •   3698 JsonPath - Extract data from JSON using XPATH-like syntax.
  •    770 Jolt - JSON to JSON transformation tool.
  •    134 JsonSurfer - Streaming JsonPath processor dedicated to processing big and complicated JSON data.

JVM and JDK

Current implementations of the JVM/JDK.

  •   8779 Graal - Polyglot embeddable JVM.
  •   1728 OpenJ9 - High performance, enterprise-calibre, flexibly licensed, openly-governed cross-platform JVM extending and augmenting the runtime technology components from the Eclipse OMR and OpenJDK project.
  •   1153 Avian - JVM with JIT, AOT modes and iOS port.
  •    852 ParparVM - VM with non-blocking, concurrent GC for iOS.
  •     18 Adopt Open JDK - OpenJDK builds which allows to choose between HotSpot and OpenJ9.
  •      0 Corretto - No-cost, multiplatform, production-ready distribution of OpenJDK by Amazon.
  •      0 Liberica JDK - Built from OpenJDK, thoroughly tested and passed the JCK.
  •      0 Open JDK - Open JDK distributed by Oracle.
  •      0 RedHat Open JDK - RedHat's OpenJDK distribution.
  •      0 Zulu - OpenJDK builds for Windows, Linux, and Mac OS X.

Logging

Libraries that log the behavior of an application.

  •  11654 Kibana - Analyzes and visualizes log files. Some features require payment.
  •  10090 Logstash - Tool for managing log files.
  •    845 p6spy - Enables logging for all JDBC transactions without changes to the code.
  •    383 Logbook - Extensible, open-source library for HTTP request and response logging.
  •    208 tinylog - Lightweight logging framework with static logger class.
  •    107 Tracer - Call tracing and log correlation in distributed systems.
  •      0 Graylog - Open-source aggregator suited for extended role and permission management.
  •      0 Apache Log4j 2 - Complete rewrite with a powerful plugin and configuration architecture.
  •      0 SLF4J - Abstraction layer/simple logging facade.
  •      0 Logback - Robust logging library with interesting configuration options via Groovy.

Machine Learning

Tools that provide specific statistical algorithms for learning from data.

  •  10685 Deeplearning4j - Distributed and multi-threaded deep learning library.
  •   8516 Apache Flink - Fast, reliable, large-scale data processing engine.
  •   1684 DeepDive - Creates structured information from unstructured data and integrates it into an existing database.
  •   1658 Apache Mahout - Scalable algorithms focused on collaborative filtering, clustering and classification.
  •   1605 Oryx 2 - Framework for building real-time, large-scale machine learning applications. Includes end-to-end applications for collaborative filtering, classification, regression, and clustering.
  •   1024 DatumBox - Provides several algorithms and pre-trained models for natural language processing.
  •    556 JSAT - Algorithms for pre-processing, classification, regression, and clustering with support for multi-threaded execution.
  •    336 Apache Spark - Data analytics cluster-computing framework.
  •      0 H2O - Analytics engine for statistics over big data.
  •      0 Weka - Collection of algorithms for data mining tasks ranging from pre-processing to visualization.
  •      0 Smile - The Statistical Machine Intelligence and Learning Engine provides a set of machine learning algorithms and a visualization library.

Messaging

Tools that help send messages between clients to ensure protocol independency.

  •  20849 EventBus - Simple publish/subscribe event bus.
  •   7646 Apache RocketMQ - A fast, reliable, and scalable distributed messaging platform.
  •   4335 Aeron - Efficient, reliable, unicast and multicast message transport.
  •   3287 Apache Pulsar - Distributed pub/sub-messaging system.
  •   2583 Apache Camel - Glues together different transport APIs via Enterprise Integration Patterns.
  •   1923 Smack - Cross-platform XMPP client library.
  •   1678 JeroMQ - Implementation of ZeroMQ.
  •    730 RabbitMQ Java client - RabbitMQ client.
  •    481 Nakadi - Provides a RESTful API on top of Kafka.
  •    422 Hermes - Fast and reliable message broker built on top of Kafka.
  •    190 NATS client - NATS client.
  •      0 Apache Kafka - High-throughput distributed messaging system.
  •      0 Apache Qpid - Apache Qpid makes messaging tools that speak AMQP and support many languages and platforms.
  •      0 Apache ActiveMQ - Message broker that implements JMS and converts synchronous to asynchronous communication.

Miscellaneous

Everything else.

  •  47182 Design Patterns - Implementation and explanation of the most common design patterns.
  •  11516 Modern Java - A Guide to Java 8 - Popular Java 8 guide.
  •  10787 FizzBuzz Enterprise Edition - No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.
  •   6180 OpenRefine - Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.
  •   5433 J2ObjC - Java-to-Objective-C translator for porting Android libraries to iOS.
  •   3454 OctoLinker - Browser extension which allows to navigate through code on GitHub more efficiently.
  •   3289 JavaCV - Java interface to OpenCV, FFmpeg, and more.
  •   2798 Failsafe - Simple failure handling with retries and circuit breakers.
  •   1612 Jimfs - In-memory file system.
  •    998 JBot - Framework for building chatbots.
  •    963 CQEngine - Ultra-fast, SQL-like queries on Java collections.
  •    963 Maven Wrapper - Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.
  •    852 Codename One - Cross-platform solution for writing native mobile apps.
  •    757 JBake - Static website generator.
  •    634 Polyglot for Maven - Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
  •    551 FF4J - Feature Flags for Java.
  •    518 Togglz - Implementation of the Feature Toggles pattern.
  •    479 Multi-OS Engine - An open-source, cross-platform engine to develop native mobile (iOS, Android, etc.) apps.
  •    391 Joda-Money - Basic currency and money classes and algorithms not provided by the JDK.
  •    380 TypeTools - Tools for resolving generic types.
  •    280 Membrane Service Proxy - An open-source, reverse-proxy framework written in Java.
  •    246 Smooks - Extensible framework for building applications that process data which means bindings, transformations, message processing and enrichment.
  •    196 Modernizer - Detect uses of legacy Java APIs.
  •     50 XMLBeam - Processes XML by using annotations or XPath within code.
  •     48 MinimalFTP - Lightweight, small and customizable FTP server.
  •     30 JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
  •     18 PipelinR – Small utility library for using handlers and commands with pipelines.
  •      0 JavaX - Reinventing and extending Java with a focus on simplicity.
  •      0 JPad - Snippet runner.
  •      0 LightAdmin - Pluggable CRUD UI library for rapid application development.

Microservice

Tools for creating and managing microservices.

  •   7623 Eureka - REST-based service registry for resilient load balancing and failover.
  •   2157 Lagom - Framework for creating microservice-based systems.
  •    285 consul-api - Client for the Consul API: a distributed, highly available and datacenter-aware registry/discovery service.
  •    208 Helidon - Two-style approach for writing microservices: Functional-reactive and as an implementation of MicroProfile.
  •      0 Micronaut - Modern full-stack framework with focus on modularity, minimal memory footprint and startup time.
  •      0 Apollo - Libraries for writing composable microservices.

Monitoring

Tools that monitor applications in production.

  •  22569 LeakCanary - Memory leak detection.
  •  10930 zipkin - Distributed tracing system which gathers timing data needed to troubleshoot latency problems in microservice architectures.
  •   8586 Pinpoint - Open-source APM tool.
  •   1782 JavaMelody - Performance monitoring and profiling.
  •   1500 jmxtrans - Connect to multiple JVMs and query them for their attributes via JMX. Its query language is based on JSON, which allows non-Java programmers to access the JVM attributes. Supports different output writes, including Graphite, Ganglia, and StatsD.
  •   1456 Stagemonitor - Open-source performance monitoring and transaction tracing for JVM apps.
  •    885 BugSnag c - Exception and error monitoring with an integration of several third party tools for a better workflow and a free hobbyist tier.
  •    615 Jolokia - JMX over REST.
  •    595 Glowroot - Open-source Java APM.
  •    508 Automon - Combines the power of AOP with monitoring and/or logging tools.
  •    475 inspectIT - Captures detailed run-time information via hooks that can be changed on the fly. It supports tracing over multiple systems via the OpenTracing API and can correlate the data with end user monitoring.
  •    265 Jaeger client - Jaeger client.
  •    147 Sysmon - Lightweight platform monitoring tool for Java VMs.
  •    134 nudge4j - Remote developer console from the browser for Java 8 via bytecode injection.
  •     97 Datadog c - Modern monitoring & analytics.
  •     40 Failsafe Actuator - Out of the box monitoring of Failsafe Circuit Breaker in Spring-Boot environment.
  •      0 Kamon - Tool for monitoring applications running on the JVM.
  •      0 OverOps c - In-production error monitoring and debugging.
  •      0 New Relic c - Performance monitor.
  •      0 Prometheus - Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.
  •      0 SPM c - Performance monitor with distributing transaction tracing for JVM apps.
  •      0 Metrics - Expose metrics via JMX or HTTP and send them to a database.
  •      0 Instrumental c - Real-time Java application performance monitoring. A commercial service with free development accounts.
  •      0 AppDynamics c - Performance monitor.

Native

For working with platform-specific native libraries.

  •   4805 JNA - Work with native libraries without writing JNI. Also provides interfaces to common system libraries.
  •   2769 JavaCPP - Provides efficient and easy access to native C++.
  •    606 JNR - Work with native libraries without writing JNI. Also provides interfaces to common system libraries. Same goals as JNA, but faster, and serves as the basis for the upcoming Project Panama.

Natural Language Processing

Libraries that specialize in processing text.

  •   6168 CoreNLP - Provides a set of fundamental tools for tasks like tagging, named entity recognition, and sentiment analysis.
  •    337 CogCompNLP - Provides common annotators for plain text input.
  •     25 Lingua - Natural language detection library, especially suited for short paragraphs of text.
  •      0 DKPro - Collection of reusable NLP tools for linguistic pre-processing, machine learning, lexical resources, etc.
  •      0 LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.

Networking

Libraries for building network servers.

  •  26170 Dubbo - High-performance RPC framework.
  •  19024 Netty - Framework for building high-performance network applications.
  •   7058 Finagle - Extensible RPC system for constructing high-concurrency servers. It implements uniform client and server APIs for several protocols, and is protocol-agnostic to simplify implementation of new protocols.
  •   5850 gRPC - RPC framework based on protobuf and HTTP/2.
  •   2258 Undertow - Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly.
  •   1436 KryoNet - Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.
  •   1436 sshj - Programatically use SSH, SCP or SFTP.
  •    864 Nifty - Implementation of Thrift clients and servers on Netty.
  •    522 Comsat - Integrates standard Java web-related APIs with Quasar fibers and actors.
  •    221 AkkaGRPC - Support for building streaming gRPC servers and clients on top of Akka Streams.
  •     58 TLS Channel - Implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS.
  •     11 urnlib - Represent, parse and encode URNs, as in RFC 2141.
  •      0 MINA - Abstract, event-driven async I/O API for network operations over TCP/IP and UDP/IP via Java NIO.
  •      0 Grizzly - NIO framework. Used as a network layer in Glassfish.

ORM

APIs that handle the persistence of objects.

  •  10541 MyBatis - Couples objects with stored procedures or SQL statements.
  •   3786 Hibernate - Robust and widely used, with an active community.
  •    842 Ebean - Provides simple and fast data access.
  •    277 SimpleFlatMapper - Simple database and CSV mapper.
  •    172 Apache Cayenne - Provides a clean, static API for data access. Also includes a GUI Modeler for working with database mappings, and DB reverse engineering and generation.
  •      0 EclipseLink - Supports a number of persistence standards: JPA, JAXB, JCA and SDO.

PaaS

Java platform as a service.

PDF

Tools to help with PDF file creation.

Performance analysis

Tools for performance analysis, profiling and benchmarking.

  •   1679 JITWatch - Analyze the JIT compiler optimisations made by the HotSpot JVM.
  •    969 honest-profiler - A low-overhead, bias-free sampling profiler.
  •    490 jHiccup - Logs and records platform JVM stalls.
  •    350 LatencyUtils - Utilities for latency measurement and reporting.
  •    313 JMH - a Java harness for building, running, and analysing nano/micro/milli/macro benchmarks written in Java and other languages targeting the JVM.
  •      0 fastThread c - Analyze and visualize thread dumps with a free cloud-based upload interface.
  •      0 JProfiler c - Database profiling for JDBC, JPA and NoSQL, with JEE support.
  •      0 GCeasy c - Tool to analyze and visualize GC logs. It provides a free cloud-based upload interface.
  •      0 XRebel c - Real-time profiling for web applications, with an in-browser widget.
  •      0 YourKit Java Profiler c - Profiler for any application running on the JVM.

Platform

Frameworks that are suites of multiple libraries encompassing several categories.

Apache Commons

  •   7128 Compress - Defines an API for working with tar, zip and bzip2 files.
  •   1625 Lang - Provides extra functionality for classes in java.lang.
  •    347 Collections - Extends or augments the Java Collections Framework.
  •    157 Imaging - A pure-Java image library.
  •    150 CSV - Component for reading and writing comma separated value files.
  •    138 SCXML - An implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.
  •     91 BCEL - Byte Code Engineering Library - analyze, create, and manipulate Java class files.
  •     22 RDF - Common implementation of RDF 1.1 that could be implemented by systems on the JVM.
  •      0 CLI - Command-line arguments parser.
  •      0 Codec - General encoding/decoding algorithms (for example phonetic, base64, URL).
  •      0 CLI2 Redesign of Commons CLI.
  •      0 Configuration - Reading of configuration/preferences files in various formats.
  •      0 Convert - Commons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.
  •      0 ClassScan - Find Class interfaces, methods, fields, and annotations without loading.
  •      0 Daemon - Alternative invocation mechanism for unix-daemon-like java code.
  •      0 DBCP - Database connection pooling services.
  •      0 DbUtils - JDBC helper library.
  •      0 Digester - XML-to-Java-object mapping utility.
  •      0 Email - Library for sending e-mail from Java.
  •      0 Exec - API for dealing with external process execution and environment management in Java.
  •      0 FileUpload - File upload capability for your servlets and web applications.
  •      0 Chain - Chain of Responsibility pattern implementation.
  •      0 Flatfile - Java library for working with flat data structures.
  •      0 Functor - A functor is a function that can be manipulated as an object, or an object representing a single, generic function.
  •      0 Graph - A general purpose Graph APIs and algorithms.
  •      0 I18n - Adds the feature of localized message bundles that consist of one or many localized texts that belong together.
  •      0 Id - Id is a component used to generate identifiers.
  •      0 Finder - Java library inspired by the UNIX find command.
  •      0 IO - Collection of I/O utilities.
  •      0 Javaflow - Continuation implementation to capture the state of the application.
  •      0 JCI - Java Compiler Interface.
  •      0 JCS - Java Caching System.
  •      0 Jelly - XML based scripting and processing engine.
  •      0 Jexl - Expression language which extends the Expression Language of the JSTL.
  •      0 JNet - JNet allows to use dynamically register url stream handlers through the java.net API.
  •      0 JXPath - Utilities for manipulating Java Beans using the XPath syntax.
  •      0 BSF - Bean Scripting Framework - interface to scripting languages, including JSR-223.
  •      0 Logging Wrapper around a variety of logging API implementations.
  •      0 Math - Lightweight, self-contained mathematics and statistics components.
  •      0 Monitoring - Monitoring aims to provide a simple but extensible monitoring solution for Java applications.
  •      0 Nabla - Nabla provides automatic differentiation classes that can generate derivative of any function implemented in the Java language.
  •      0 Net - Collection of network utilities and protocol implementations.
  •      0 OGNL - An Object-Graph Navigation Language.
  •      0 OpenPGP - Interface to signing and verifying data using OpenPGP.
  •      0 Performance - A small framework for microbenchmark clients, with implementations for Commons DBCP and Pool.
  •      0 Pipeline - Provides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects.
  •      0 Pool - Generic object pooling component.
  •      0 Proxy - Library for creating dynamic proxies.
  •      0 BeanUtils2 - Redesign of Commons BeanUtils.
  •      0 RNG - Commons Rng provides implementations of pseudo-random numbers generators.
  •      0 BeanUtils - Easy-to-use wrappers around the Java reflection and introspection APIs.
  •      0 Validator - Framework to define validators and validation rules in an xml file.
  •      0 VFS - Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.
  •      0 Weaver - Provides an easy way to enhance (weave) compiled bytecode.

Other

  •   2250 Light-Java - A fast, lightweight and productive microservices framework with built-in security.
  •    664 CUBA Platform - High-level framework for developing enterprise applications with a rich web interface, based on Spring, EclipseLink and Vaadin.
  •     94 Orienteer - Open-source business application platform for rapid configuration/development of CRM, ERP, LMS and other applications.
  •     53 Spring - Provides many packages for dependency injection, aspect-oriented programming, security, etc.

Processes

Libraries that help the management of operating system processes.

  •    518 zt-exec - Provides a unified API to Apache Commons Exec and ProcessBuilder.
  •     76 zt-process-killer - Stops processes started from Java or the system processes via PID.
  •      9 ch.vorburger.exec - Convenient API around Apache Commons Exec.

Reactive libraries

Libraries for developing reactive applications.

  •  38740 RxJava - Allows for composing asynchronous and event-based programs using observable sequences.
  •   9811 Akka - Toolkit and runtime for building concurrent, distributed, fault-tolerant and event-driven applications.
  •   3026 Reactive Streams - Provides a standard for asynchronous stream processing with non-blocking backpressure.
  •    145 vert.x - Polyglot event-driven application framework.
  •      0 Reactor - Library for building reactive fast-data applications.

REST Frameworks

Frameworks specifically for creating RESTful services.

  •   8264 Spark - Sinatra inspired framework.
  •   2737 javalin - Javalin is just a few thousand lines of code on top of Jetty, which means its performance is almost equivalent to pure Jetty.
  •   1916 rest.li - Framework for building robust, scalable RESTful architectures using typesafe bindings and asynchronous, non-blocking IO with an end-to-end developer workflow that promotes clean practices, uniform interface design and consistent data modeling.
  •   1400 Rapidoid - A simple, secure and extremely fast framework consisting of an embedded HTTP server, GUI components and dependency injection.
  •    904 Microserver — A convenient, extensible microservices plugin system for Spring & Spring Boot. With more than 30 plugins and growing, it supports both micro-monolith and pure microservices styles.
  •    870 RestExpress - Thin wrapper on the JBoss Netty HTTP stack that provides scaling and performance.
  •    804 RESTEasy - Fully certified and portable implementation of the JAX-RS specification.
  •    598 Restlet Framework - Pioneering framework with powerful routing and filtering capabilities, and a unified client and server API.
  •    533 Elide - Opinionated framework for JSON- or GraphQL-APIs based on a JPA data model.
  •    219 Jersey - JAX-RS reference implementation.
  •     12 Crnk - Implementation of the JSON API specification to build resource-oriented REST endpoints with sorting, filtering, paging, linking, object graphs, type-safety, bulk updates, integrations and more.
  •      0 Swagger - Standard, language-agnostic interface to REST APIs.
  •      0 Dropwizard - Opinionated framework for setting up modern web applications with Jetty, Jackson, Jersey and Metrics.

Science

Libraries for scientific computing, analysis and visualization.

  •   1454 Tablesaw - Includes a data-frame, an embedded column store, and hundreds of methods to transform, summarize, or filter data.
  •   1417 JGraphT - Graph library that provides mathematical graph-theory objects and algorithms.
  •    774 XChart - A light-weight library for plotting data. Many customizable chart types are available.
  •    539 JGraphX - Library for visualizing (mainly Swing) and interacting with node-edge graphs.
  •    399 JFreeChart - 2D chart library for Swing, JavaFX and server-side applications.
  •    294 GraphStream - Library for modeling and analyzing dynamic graphs.
  •    144 Morpheus - Provides a versatile two-dimensional memory efficient tabular data structure called a DataFrame to enable efficient in-memory analytics for scientific computing on the JVM.
  •     92 Erdos - Modular, light and easy graph framework for theoretic algorithms.
  •     63 Orson-Charts - Generates a wide variety of 3D charts that can be displayed with Swing and JavaFX or exported to PDF, SVG, PNG and JPEG.
  •     24 Mines Java Toolkit - Library for geophysical scientific computation, visualization and digital signal analysis.
  •      0 DataMelt - Environment for scientific computation, data analysis and data visualization.

Search

Engines that index documents for search and analysis.

  •     28 Indexer4j - Simple and light full text indexing and searching library.
  •      0 Apache Lucene - High-performance, full-featured, cross-platform, text search engine library.
  •      0 Apache Solr - Enterprise search engine optimized for high-volume traffic.
  •      0 Elasticsearch - Distributed, multitenant-capable, full-text search engine with a RESTful web interface and schema-free JSON documents.

Security

Libraries that handle security, authentication, authorization or session management.

  •  12375 Vault - Secures, stores, and tightly controls access to tokens, passwords, certificates, API keys, and other secrets. It handles leasing, key revocation, key rolling, and auditing. Through a unified API, users can access an encrypted Key/Value store and network encryption-as-a-service, or generate AWS IAM/STS credentials, SQL/NoSQL databases, X.509 certificates, SSH credentials, and more.
  •   7573 Tink - Provides a simple and misuse-proof API for common cryptographic tasks.
  •   4701 jjwt - JSON web token for Java and Android.
  •   2969 Cryptomator - Multiplatform, transparent, client-side encryption of files in the cloud.
  •   2330 Apache Shiro - Performs authentication, authorization, cryptography and session management.
  •   2071 Keywhiz - System for distributing and managing secrets.
  •   1564 pac4j - Security engine.
  •   1095 Keyczar - Easy-to-use, safe encryption framework with key versioning.
  •    902 Bouncy Castle - All-purpose cryptographic library and JCA provider offering a wide range of functions, from basic helpers to PGP/SMIME operations.
  •    744 Themis - Multi-platform high-level cryptographic library provides easy-to-use encryption for protecting sensitive data: secure messaging with forward secrecy, secure data storage (AES256GCM); suits for building end-to-end encrypted applications.
  •    194 Kalium - Binding for the Networking and Cryptography (NaCl) library.
  •    169 Hdiv - Runtime application that repels application security risks included in the OWASP Top 10, including SQL injection, cross-site scripting, cross-site request forgery, data tampering, and brute force attacks.
  •    154 Nbvcxz - Advanced password strength estimation.
  •    100 OACC - Provides permission-based authorization services.
  •     88 PicketLink - Umbrella project for security and identity management.
  •     87 Keycloak - Integrated SSO and IDM for browser apps and RESTful web services.
  •     47 Jwks RSA - JSON Web Key Set parser.
  •     23 SecurityBuilder - Fluent Builder API for JCA and JSSE classes and especially X.509 certificates.

Serialization

Libraries that handle serialization with high efficiency.

  •  11962 FlatBuffers - Memory-efficient serialization library that can access serialized data without unpacking and parsing it.
  •   4045 Kryo - Fast and efficient object graph serialization framework.
  •   1125 FST - JDK-compatible, high-performance object graph serialization.
  •    967 MessagePack - Efficient binary serialization format.
  •      9 PHP Serializer - Serializing objects in the PHP serialization format.

Server

Servers specifically used to deploy applications.

  •   4658 nanohttpd - Tiny, easily embeddable HTTP server.
  •   2453 Jetty - Provides a Web server and javax.servlet container, plus support for HTTP/2, WebSocket, OSGi, JMX, JNDI, JAAS and many other integrations.
  •   2258 WildFly - Formerly known as JBoss and developed by Red Hat with extensive Java EE support.
  •      0 Apache Tomcat - Robust, all-round server for Servlet and JSP.
  •      0 Apache TomEE - Tomcat plus Java EE.
  •      0 WebSphere Liberty - Lightweight, modular server developed by IBM.

Template Engine

Tools that substitute expressions in a template.

  •    635 Jade4J - Implementation of Pug (formerly known as Jade).
  •    456 Rocker - Optimized, memory efficient and speedy template engine producing statically typed, plain objects.
  •    280 Jtwig - Modular, configurable and fully tested template engine.
  •      0 Pebble - Inspired by Twig and separates itself with its inheritance feature and its easy-to-read syntax. It ships with built-in autoescaping for security and it includes integrated support for internationalization.
  •      0 Thymeleaf - Aims to be a substitute for JSP and works for XML files.
  •      0 Handlebars.java - Logicless and semantic Mustache templates.

Testing

Tools that test from model to the view.

Asynchronous

Tools that simplify testing asynchronous services.

  •   3872 REST Assured - DSL for easy testing of REST/HTTP services.
  •   1619 Awaitility - DSL for synchronizing asynchronous operations.
  •    306 GreenMail - In-memory email server for integration testing. Supports SMTP, POP3 and IMAP including SSL.
  •    303 ConcurrentUnit - Toolkit for testing multi-threaded and asynchronous applications.
  •     93 Hoverfly Java - Native bindings for Hoverfly, a proxy which allows you to simulate HTTP services.

BDD

Testing for the software development process that emerged from TDD and was heavily influenced by DDD and OOAD.

  •   1903 Cucumber - Provides a way to describe features in a plain language which customers can understand.
  •    239 JGiven - Provides a fluent API which allows for simpler composition.
  •    232 Lamdba Behave - Aims to provide a fluent API to write tests in long and descriptive sentences that read like plain English.
  •     74 Cukes-REST - A collection of Gherkin steps for REST-service testing using Cucumber.
  •     46 J8Spec - Follows a Jasmine-like syntax.
  •      0 JBehave - Extensively configurable framework that describes stories.

Fixtures

Everything related to the creation and handling of random data.

  •   1186 Java Faker - A port of Ruby's fake data generator.
  •    304 Fixture Factory - Generates fake objects from a template.
  •    138 Randomized Testing - JUnit test runner and plugins for running JUnit tests with pseudo-randomness.
  •     84 Beanmother - Sets up beans from YAML fixtures.
  •     27 JFairy - Fake data generator.

Frameworks

Provide environments to run tests for a specific use case.

  •   3073 JUnit - Common testing framework.
  •   2910 Apache JMeter - Functional testing and performance measurements.
  •    827 PIT - Fast mutation-testing framework for evaluating fault-detection abilities of existing JUnit or TestNG test suites.
  •    697 ArchUnit - Test library for specifying and asserting architecture rules.
  •    638 Pact JVM - Consumer-driven contract testing.
  •    266 Citrus - Integration testing framework that focuses on both client- and server-side messaging.
  •      0 Arquillian - Integration and functional testing platform for Java EE containers.
  •      0 Gatling - Load testing tool designed for ease of use, maintainability and high performance.

Matchers

Libraries that provide custom matchers.

  •   1685 Truth - Google's assertion and proposition framework.
  •    599 JSONAssert - Simplifies testing JSON strings.
  •      0 AssertJ - Fluent assertions that improve readability.

Miscellaneous

Other stuff related to testing.

  •   2309 TestContainers - Provides throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
  •    182 Mutability Detector - Reports whether instances of a given class are immutable.
  •     69 raml-tester - Tests if a request/response matches a given RAML definition.
  •     33 pojo-tester - Automatically performs tests on basic POJO methods.

Mocking

Tools which mock collaborators to help testing single, isolated units.

  •   8717 Mockito - Mocking framework that lets you write tests with a clean and simple API.
  •   3157 WireMock - Stubs and mocks web services.
  •   2610 Moco - Concise web services for stubs and mocks.
  •   2504 PowerMock - Mocks static methods, constructors, final classes and methods, private methods, and removal of static initializers.
  •   2039 MockServer - Allows mocking of systems integrated with HTTPS.
  •    303 JMockit - Integration testing, API mocking and faking, and code coverage.

Parameterization

Simplifies the writing of parameterized tests.

  •    435 Burst - A unit testing library for varying test data.
  •    194 junit-dataprovider - A TestNG-like data provider/runner for JUnit.
  •      0 JUnitParams - Creates readable and maintainable parametrised tests.

Utility

Libraries which provide general utility functions.

  •  31393 Guava - Collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and more.
  •   3256 Gephi - Cross-platform for visualizing and manipulating large graph networks.
  •   1748 JavaVerbalExpressions - Library that helps with constructing difficult regular expressions.
  •   1110 Dex - Java/JavaFX tool capable of powerful ETL and data visualization.
  •    540 bucket4j - Rate limiting library based on token-bucket algorithm.
  •    447 cactoos - Collection of object-oriented primitives.
  •    220 Underscore-java - Port of Underscore.js functions.
  •    171 minio-java - Provides simple APIs to access any Amazon S3-compatible object storage server.
  •     10 fswatch - Micro library to watch for directory file system changes, simplifying java.nio.file.WatchService
  •      0 Embulk - Bulk data loader that helps data transfer between various databases, storages, file formats, and cloud services.
  •      0 JADE - Framework and environment for building and debugging multi-agent systems.
  •      0 JGit - A lightweight, pure Java library implementing the Git version control system.
  •      0 Protégé - Provides an ontology editor and a framework to build knowledge-based systems.
  •      0 CRaSH - Provides a shell into a JVM that's running CRaSH. Used by Spring Boot and others.

Version Managers

Utilities that help create the development shell environment and switch between different Java versions.

  •   2632 SDKMan - Java Version Manager inspired by RVM and rbenv. Supports UNIX-based platforms and Windows.
  •   2416 jenv - Java Version Manager inspired by rbenv. Can configure globally or per project. Tested on Debian and Mac OS X.
  •    850 jabba - Java Version Manager inspired by nvm. Supports Mac OS X, Linux and Windows.

Web Crawling

Libraries that analyze the content of websites.

  •   7892 webmagic - Scalable crawler with downloading, url management, content extraction and persistent.
  •   6990 jsoup - Scrapes, parses, manipulates and cleans HTML.
  •   3505 Crawler4j - Simple and lightweight web crawler.
  •    516 StormCrawler - SDK for building low-latency and scalable web crawlers.
  •      0 Apache Nutch - Highly extensible, highly scalable web crawler for production environments.

Web Frameworks

Frameworks that handle the communication between the layers of a web application.

  •   8029 Jooby - Scalable, fast and modular micro-framework that offers multiple programming models.
  •   4706 Blade - Lightweight, modular framework that aims to be elegant and simple.
  •   1833 Ninja - Full-stack web framework.
  •   1150 Bootique - Minimally opinionated framework for runnable apps.
  •    707 Pippo - Small, highly modularized, Sinatra-like framework.
  •    485 Takes - Opinionated web framework which is built around the concepts of True Object-Oriented Programming and immutability.
  •    256 Firefly - Asynchronous framework for rapid development of high-performance web application.
  •      0 Apache Tapestry - Component-oriented framework for creating dynamic, robust, highly scalable web applications.
  •      0 Grails - Groovy framework that provides a highly productive environment by favoring convention over configuration, no XML and support for mixins.
  •      0 Play - Built on Akka, it provides predictable and minimal resource consumption (CPU, memory, threads) for highly-scalable applications in Java and Scala.
  •      0 PrimeFaces - JSF framework with both free and commercial/support versions and frontend components.
  •      0 Apache Wicket - Component-based web application framework similar to Tapestry, with a stateful GUI.
  •      0 Vaadin Flow - Event-driven framework that uses standard web components. Server-side architecture with Ajax on the client side.
  •      0 Ratpack - Set of libraries that facilitate fast, efficient, evolvable and well-tested HTTP applications.

Resources

Awesome Lists

Awesome lists related to the Java & JVM ecosystem.

Communities

Active discussions.

  •      4 VirtualJUG - Virtual Java User Group.
  •      0 r/java - Subreddit for the Java community.
  •      0 stackoverflow - Question/answer platform.

Frontends

Websites that provide a frontend for this list. Please note, there won't be an official website. We don't associate with a particular website and everybody is allowed to create one.

Influential Books

Books that made a big impact and are still worth reading.

Podcasts and Screencasts

Something to look at or listen to while programming.

Twitter

Active accounts to follow. Descriptions from Twitter.

  •      0 Adam Bien - Freelance author, JavaOne Rockstar speaker, consultant, Java Champion.
  •      0 Aleksey Shipilëv - Performance geek, benchmarking czar, concurrency bug hunter.
  •      0 Antonio Goncalves - Java Champion, JUG Leader, Devoxx France, Java EE 6/7, JCP, Author.
  •      0 Arun Gupta - Java Champion, JavaOne Rockstar, JUG Leader, Devoxx4Kids-er, VP of Developer Advocacy at Couchbase.
  •      0 Brian Goetz - Java Language Architect at Oracle.
  •      0 Bruno Borges - Product Manager/Java Jock at Oracle.
  •      0 Chris Richardson - Software architect, consultant, and serial entrepreneur, Java Champion, JavaOne Rock Star, *POJOs in Action- author.
  •      0 Ed Burns - Consulting Member of the Technical Staff at Oracle.
  •      0 Eugen Paraschiv - Author of the Spring Security Course.
  •      0 Heinz Kabutz - Java Champion, speaker, author of The Java Specialists' Newsletter, concurrency performance expert.
  •      0 Holly Cummins - Technical Lead of IBM London's Bluemix Garage, Java Champion, developer, author, JavaOne rockstar.
  •      0 James Weaver - Java/JavaFX/IoT developer, author and speaker.
  •      0 Java EE - Official Java EE Twitter account.
  •      0 Java Magazine - Official Java Magazine account.
  •      0 Java - Official Java Twitter account.
  •      0 Javin Paul - Well-known Java blogger.
  •      0 Josh Long - Spring Advocate at Pivotal, author of O'Reilly's Cloud Native Java- and Building Microservices with Spring Boot, JavaOne Rock Star.
  •      0 Lukas Eder - Java Champion, speaker, JUG.ch co-leader, Founder and CEO Data Geekery (jOOQ).
  •      0 Mario Fusco - RedHatter, JUG coordinator, frequent speaker and author.
  •      0 Mark Heckler - Pivotal Principal Technologist and Developer Advocate, conference speaker, published author, and Java Champion, focusing on Internet of Things and the cloud.
  •      0 Mark Reinhold - Chief Architect, Java Platform Group, Oracle.
  •      0 Markus Eisele - Java EE evangelist, Red Hat.
  •      0 Martijn Verburg - London JUG co-leader, speaker, author, Java Champion and much more.
  •      0 Martin Thompson - Pasty faced performance gangster.
  •      0 Monica Beckwith - Performance consultant, JavaOne Rock Star.
  •      0 OpenJDK - Official OpenJDK account.
  •      0 Peter Lawrey - Peter Lawrey, Java performance expert.
  •      0 Randy Shoup - Stitch Fix VP Engineering, speaker, JavaOne Rock Star.
  •      0 Reza Rahman - Java EE/GlassFish/WebLogic evangelist, author, speaker, open source hacker.
  •      0 Sander Mak - Java Champion, author.
  •      0 Simon Maple - Java Champion, VirtualJUG founder, LJC leader, RebelLabs author.
  •      0 Stephen Colebourne - Java Champion, speaker.
  •      0 Trisha Gee - Java Champion and speaker.
  •      0 Venkat Subramaniam - Author, University of Houston professor, MicroSoft MVP award recipient, JavaOne Rock Star, Java Champion.

Websites

Sites to read.

Contributing

Contributions are very welcome!

Please have a look at the CONTRIBUTING guidelines.

@ktprezes
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ktprezes commented Dec 31, 2019

Great List!
btw - what do these numbers mean?

@kvnxiao
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kvnxiao commented Dec 31, 2019

@ktprezes See https://github.com/kvnxiao/sort-awesome-lists

This is not my list, it is from https://github.com/akullpp/awesome-java

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