Tüm Yabancı Kaynaklar

Java framework, paket ve yazılımları hakkında tüm yabancı kaynaklar (awesome java)


Bean Mapping

Frameworks that ease bean mapping.
  • 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.
  • Dozer - Mapper that copies data from one object to another using annotations and API or XML configuration.
  • JMapper - Uses byte code manipulation for lightning-fast mapping. Supports annotations and API or XML configuration.
  • MapStruct - Code generator that simplifies mappings between different bean types, based on a convention-over-configuration approach.
  • ModelMapper - Intelligent object mapping library that automatically maps objects to each other.
  • Orika - JavaBean-mapping framework that recursively copies (among other capabilities) data from one object to another.
  • reMap - Lambda and method handle-based mapping which requires code and not annotations if objects have different names.
  • Selma - Annotation processor-based bean mapper.


Tools that handle the build cycle and dependencies of an application.
  • 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.
  • Bazel - Tool from Google that builds code quickly and reliably.
  • Buck - Encourages the creation of small, reusable modules consisting of code and resources.
  • Gradle - Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.

Bytecode Manipulation

Libraries to manipulate bytecode programmatically.
  • ASM - All-purpose, low-level bytecode manipulation and analysis.
  • Byte Buddy - Further simplifies bytecode generation with a fluent API.
  • bytecode-viewer - Java 8 Jar & Android APK reverse engineering suite. (GPL-3.0-only)
  • Byteman - Manipulate bytecode at runtime via DSL (rules); mainly for testing/troubleshooting. (LGPL-2.1-or-later)
  • cglib - Bytecode generation library.
  • Javassist - Tries to simplify bytecode editing.
  • Mixin - Manipulate bytecode at runtime using real Java code.
  • Perses - Dynamically injects failure/latency at the bytecode level according to principles of chaos engineering.


Libraries that provide caching facilities.
  • cache2k - In-memory high performance caching library.
  • Caffeine - High-performance, near-optimal caching library.
  • Ehcache - Distributed general-purpose cache.
  • Infinispan - Highly concurrent key/value datastore used for caching.


Libraries for everything related to the CLI.
  • ASCII Table - Library to draw tables in ASCII.
  • Airline - Annotation-based framework for parsing Git-like command-line arguments.
  • args4j - Small library to parse command-line arguments.
  • Jansi - ANSI escape codes to format console output.
  • Java ASCII Render - Graphical primitives for the console.
  • JCommander - Command-line argument-parsing framework with custom types and validation via implementing interfaces.
  • jbock - Typesafe, reflection-free, annotation based command-line parser.
  • Jexer - Advanced console (and Swing) text user interface (TUI) library, with mouse-draggable windows, built-in terminal window manager, and sixel image support. Looks like Turbo Vision.
  • JLine - Includes features from modern shells like completion or history.
  • JOpt Simple - Fluent parser that uses the POSIX#getopt and GNU#getopt_long syntaxes.
  • picocli - ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.
  • Text-IO - Aids the creation of full console-based applications.
  • Lanterna - Easy console text-GUI library, similar to curses. (LGPL-3.0-only)

Cluster Management

Frameworks that can dynamically manage applications inside of a cluster.
  • Apache Aurora - Mesos framework for long-running services and cron jobs.
  • Apache Mesos - Abstracts CPU, memory, storage, and other compute resources away from machines.
  • Singularity - Mesos framework that makes deployment and operations easy. It supports web services, background workers, scheduled jobs, and one-off tasks.

Code Analysis

Tools that provide metrics and quality measurements.
  • Checkstyle - Static analysis of coding conventions and standards. (LGPL-2.1-or-later)
  • Error Prone - Catches common programming mistakes as compile-time errors.
  • Infer - Modern static analysis tool for verifying the correctness of code.
  • jQAssistant - Static code analysis with Neo4J-based query language. (GPL-3.0-only)
  • NullAway - Eliminates NullPointerExceptions with low build-time overhead.
  • PMD - Source code analysis for finding bad coding practices.
  • SonarJava - Static analyzer for SonarQube & SonarLint. (LGPL-3.0-only)
  • Sourcetrail - Visual source code navigator.
  • Spoon - Library for analyzing and transforming Java source code.
  • Spotbugs - Static analysis of bytecode to find potential bugs. (LGPL-2.1-only)

Code Coverage

Frameworks and tools that enable code coverage metrics collection for test suites.
  • Clover - Relies on source-code instrumentation instead of bytecode instrumentation.
  • Cobertura - Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics. (GPL-2.0-only)
  • JaCoCo - Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation.

Code Generators

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


Frameworks that help to create parsers, interpreters or compilers.
  • ANTLR - Complex full-featured framework for top-down parsing.
  • JavaCC - Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.
  • JFlex - A lexical analyzer generator.


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

Constraint Satisfaction Problem Solver

Libraries that help with implementing optimization and satisfiability problems.
  • Choco - Off-the-shelf constraint satisfaction problem solver that uses constraint programming techniques.
  • JaCoP - Includes an interface for the FlatZinc language, enabling it to execute MiniZinc models. (AGPL-3.0)
  • OptaPlanner - Business planning and resource scheduling optimization solver.


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


Everything that simplifies interactions with the database.
  • Apache Drill - Distributed, schema on-the-fly, ANSI SQL query engine for Big Data exploration.
  • Apache Phoenix - High-performance relational database layer over HBase for low-latency applications.
  • AranoDB - ArangoDB Java driver.
  • Chronicle Map - Efficient, in-memory (opt. persisted to disk), off-heap key-value store.
  • druid - High-performance, column-oriented, distributed data store.
  • eXist - A NoSQL document database and application platform. (LGPL-2.1-only)
  • FlexyPool - Brings metrics and failover strategies to the most common connection pooling solutions.
  • Flyway - Simple database migration tool.
  • H2 - Small SQL database notable for its in-memory functionality.
  • HikariCP - High-performance JDBC connection pool.
  • jasync-sql - Async DB driver for MySQL and PostgreSQL.
  • JDBI - Convenient abstraction of JDBC.
  • Jedis - Small client for interaction with Redis, with methods for commands.
  • Jest - Client for the Elasticsearch REST API.
  • jetcd - Client library for etcd.
  • Jinq - Typesafe database queries via symbolic execution of Java 8 Lambdas (on top of JPA or jOOQ).
  • jOOQ - Generates typesafe code based on SQL schema.
  • Liquibase - Database-independent library for tracking, managing and applying database schema changes.
  • MapDB - Embedded database engine that provides concurrent collections backed on disk or in off-heap memory.
  • MariaDB4j - Launcher for MariaDB that requires no installation or external dependencies.
  • OrientDB - Embeddable distributed database written on top of Hazelcast.
  • Presto - Distributed SQL query engine for big data.
  • Querydsl - Typesafe unified queries.
  • Realm - Mobile database to run directly inside phones, tablets or wearables.
  • Redisson - Allows for distributed and scalable data structures on top of a Redis server.
  • 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.
  • Speedment - Database access library that utilizes Java 8's Stream API for querying.
  • sql2o - Thin JDBC wrapper that simplifies database access and provides simple mapping of ResultSets to POJOs.
  • Vibur DBCP - JDBC connection pool library with advanced performance monitoring capabilities.
  • Xodus - Highly concurrent transactional schema-less and ACID-compliant embedded database.

Data Structures

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

Date and Time

Libraries related to handling date and time.
  • Almanac Converter - Simple conversion between different calendar systems.
  • iCal4j - Parse and build iCalendar RFC 5545 data models.
  • ThreeTen-Extra - Additional date-time classes that complement those in JDK 8.
  • Time4J - Advanced date and time library. (LGPL-2.1-only)

Dependency Injection

Libraries that help to realize the Inversion of Control paradigm.
  • Apache DeltaSpike - CDI extension framework.
  • Dagger2 - Compile-time injection framework without reflection.
  • Feather - Ultra-lightweight, JSR-330-compliant dependency injection library.
  • Governator - Extensions and utilities that enhance Google Guice.
  • Guice - Lightweight and opinionated framework that completes Dagger.
  • HK2 - Lightweight and dynamic dependency injection framework.
  • JayWire - Lightweight dependency injection framework. (LGPL-3.0-only)


Augmentation of the development process at a fundamental level.
  • AspectJ - Seamless aspect-oriented programming extension.
  • DCEVM - JVM modification that allows unlimited redefinition of loaded classes at runtime. (GPL-2.0-only)
  • 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.
  • HotswapAgent - Unlimited runtime class and resource redefinition. (GPL-2.0-only)
  • JavaParser - Parse, modify and generate Java code.
  • JavaSymbolSolver - A symbol solver for Java.
  • Manifold - Re-energizes Java with powerful features like type-safe metaprogramming, structural typing and extension methods.
  • NoException - Allows checked exceptions in functional interfaces and converts exceptions to Optional return.
  • SneakyThrow - Ignores checked exceptions without bytecode manipulation. Can also be used inside Java 8 stream operations.

Distributed Applications

Libraries and frameworks for writing distributed and fault-tolerant applications.
  • Apache Geode - In-memory data management system that provides reliable asynchronous event notifications and guaranteed message delivery.
  • Apache Storm - Realtime computation system.
  • Apache ZooKeeper - Coordination service with distributed configuration, synchronization, and naming registry for large distributed systems.
  • Atomix - Fault-tolerant distributed coordination framework.
  • Axon Framework - Framework for creating CQRS applications.
  • Dropwizard Circuit Breaker - Circuit breaker design pattern for Dropwizard. (GPL-2.0-only)
  • Failsafe - Simple failure handling with retries and circuit breakers.
  • Hazelcast - Highly scalable in-memory datagrid with a free open-source version.
  • JGroups - Toolkit for reliable messaging and cluster creation.
  • Orbit - Virtual actors; adds another level of abstraction to traditional actors.
  • Quasar - Lightweight threads and actors for the JVM.
  • resilience4j - Functional fault tolerance library.
  • ScaleCube - Embeddable Cluster-Membership library based on SWIM and gossip protocol.
  • Zuul - A gateway service that provides dynamic routing, monitoring, resiliency, security, and more.

Distributed Transactions

Distributed transactions provide a mechanism for ensuring consistency of data updates in the presence of concurrent access and partial failures.
  • Atomikos - Provides transactions for REST, SOA and microservices with support for JTA and XA.
  • Bitronix - A simple but complete implementation of the JTA 1.1 API.
  • Narayana - Provides support for traditional ACID and compensation transactions, also complies with JTA, JTS and other standards. (LGPL-2.1-only)


Tools that handle the distribution of applications in native formats.
  • Boxfuse
    - Deployment of JVM applications to AWS using the principles of immutable infrastructure.
  • Capsule - Simple and powerful packaging and deployment. A fat JAR on steroids, or a "Docker for Java" that supports JVM-optimized containers.
  • 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.
  • IzPack - Setup authoring tool for cross-platform deployments.
  • Nexus
    - Binary management with proxy and caching capabilities.
  • packr - Packs JARs, assets and the JVM for native distribution on Windows, Linux and Mac OS X.
  • really-executable-jars-maven-plugin - Maven plugin for making self-executing JARs.

Document Processing

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

Formal Verification

Formal-methods tools: proof assistants, model checking, symbolic execution, etc.
  • CATG - Concolic unit testing engine. Automatically generates unit tests using formal methods.
  • Checker Framework - Pluggable type systems. Includes nullness types, physical units, immutability types and more. (GPL-2.0-only WITH Classpath-exception-2.0)
  • Daikon - Detects likely program invariants and generates JML specs based on those invariants.
  • Java Path Finder (JPF) - JVM formal verification tool containing a model checker and more. Created by NASA.
  • 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. (GPL-3.0-only)
  • 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. (GPL-2.0-or-later)
  • OpenJML - Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers. (GPL-2.0-only)

Functional Programming

Libraries that facilitate functional programming.
  • cyclops-react - Monad and stream utilities, comprehensions, pattern matching, functional extensions for all JDK collections, future streams, trampolines and much more.
  • derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching and morphisms. (GPL-3.0-only)
  • Fugue - Functional extensions to Guava.
  • Functional Java - Implements numerous basic and advanced programming abstractions that assist composition-oriented development.
  • 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.
  • protonpack - Collection of stream utilities.
  • StreamEx - Enhances Java 8 Streams.
  • Vavr - Functional component library that provides persistent data types and functional control structures.

Game Development

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


Libraries for working with geospatial data and algorithms.
  • Apache SIS - Library for developing geospatial applications.
  • Geo - GeoHash utilities in Java.
  • - Library for developing geospatial applications. Built on top of the Apache SIS project. (LGPL-2.1-only)
  • GeoTools - Library that provides tools for geospatial data. (LGPL-2.1-only)
  • GraphHopper - Road-routing engine. Used as a Java library or standalone web service.
  • H2GIS - A spatial extension of the H2 database. (LGPL-3.0-only)
  • Jgeohash - Library for using the GeoHash algorithm.
  • Mapsforge - Map rendering based on OpenStreetMap data. (LGPL-3.0-only)
  • Spatial4j - General-purpose spatial/geospatial library.


Libraries to create modern graphical user interfaces.
  • JavaFX - The successor of Swing.
  • Scene Builder - Visual layout tool for JavaFX applications.
  • SWT - The Standard Widget Toolkit, a graphical widget toolkit.

High Performance

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

HTTP Clients

Libraries that assist with creating HTTP requests and/or binding responses.
  • Armeria - Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.
  • Async Http Client - Asynchronous HTTP and WebSocket client library.
  • Feign - HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.
  • OkHttp - HTTP+SPDY client.
  • Play WS - Typesafe client with reactive streams and caching.
  • restQL-core-java - Microservice query language that fetches information from multiple services.
  • Retrofit - Typesafe REST client.
  • Ribbon - Client-side IPC library that is battle-tested in cloud.
  • Riptide - Client-side response routing for Spring's RestTemplate.
  • unirest-java - Simplified, lightweight HTTP client library.

Hypermedia Types

Libraries that handle serialization to hypermedia types.
  • JSON-LD - JSON-LD implementation.
  • Siren4J - Library for the Siren specification.


Integrated development environments that try to simplify several aspects of development.
  • Eclipse - Established open-source project with support for lots of plugins and languages.
  • IntelliJ IDEA
    - Supports many JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector.
  • jGRASP - Created to provide software visualizations that work in conjunction with the debugger such as Control Structure Diagrams, UML class diagrams and Object Viewer.
  • NetBeans - Provides integration for several Java SE and EE features, from database access to HTML5.
  • Visual Studio Code - Provides Java support for lightweight projects with a simple, modern workflow by using extensions from the internal marketplace.


Libraries that assist with the creation, evaluation or manipulation of graphical images.
  • Imgscalr - Simple, efficient and hardware-accelerated image-scaling library implemented in pure Java 2D.
  • Tess4J - A JNA wrapper for Tesseract OCR API.
  • Thumbnailator - High-quality thumbnail generation library.
  • TwelveMonkeys - Collection of plugins that extend the number of supported image file formats.
  • ZXing - Multi-format 1D/2D barcode image processing library.
  • image-comparison - Compares two images with the same sizes and shows the differences visually by drawing rectangles.


Libraries that help make the Java introspection and reflection API easier and faster to use.
  • ClassGraph - ClassGraph (formerly FastClasspathScanner) is an uber-fast, ultra-lightweight, parallelized classpath scanner and module scanner for Java, Scala, Kotlin and other JVM languages.
  • jOOR - jOOR stands for jOOR Object Oriented Reflection. It is a simple wrapper for the java.lang.reflect package.
  • Mirror - Mirror was created to bring light to a simple problem, usually named ReflectionUtil, which is on almost all projects that rely on reflection to do advanced tasks.
  • Objenesis - Allows dynamic instantiation without default constructor, e.g. constructors which have required arguments, side effects or throw exceptions.
  • ReflectASM - ReflectASM is a very small Java library that provides high performance reflection by using code generation.
  • Reflections - Reflections scans your classpath, indexes the metadata, allows you to query it on runtime and may save and collect that information for many modules within your project.

Job Scheduling

Libraries for scheduling background jobs.
  • Quartz - Feature-rich, open source job scheduling library that can be integrated within virtually any Java application.
  • Sundial - Lightweight framework to simply define jobs, define triggers and start the scheduler.
  • Wisp - Simple library with minimal footprint and straightforward API.
  • db-scheduler - Persistent and cluster-friendly scheduler.


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

JSON Processing

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


Current implementations of the JVM/JDK.
  • Adopt Open JDK - Community-driven OpenJDK builds, including both HotSpot and OpenJ9.
  • Avian - JVM with JIT, AOT modes and iOS port.
  • Corretto - No-cost, multiplatform, production-ready distribution of OpenJDK by Amazon. (GPL-2.0-only WITH Classpath-exception-2.0)
  • Graal - Polyglot embeddable JVM. (GPL-2.0-only WITH Classpath-exception-2.0)
  • Liberica JDK - Built from OpenJDK, thoroughly tested and passed the JCK. (GPL-2.0-only WITH Classpath-exception-2.0)
  • 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.
  • Open JDK - Open JDK community home. (GPL-2.0-only WITH Classpath-exception-2.0)
  • ParparVM - VM with non-blocking, concurrent GC for iOS. (GPL-2.0-only WITH Classpath-exception-2.0)
  • RedHat Open JDK - RedHat's OpenJDK distribution. (GPL-2.0-only WITH Classpath-exception-2.0)
  • SAP Machine - SAP's no-cost, rigorously tested and JCK-verified OpenJDK friendly fork. (GPL-2.0-only WITH Classpath-exception-2.0)
  • Zulu - OpenJDK builds for Windows, Linux, and Mac OS X. (GPL-2.0-only WITH Classpath-exception-2.0)


Libraries that log the behavior of an application.
  • Apache Log4j 2 - Complete rewrite with a powerful plugin and configuration architecture.
  • Graylog - Open-source aggregator suited for extended role and permission management. (GPL-3.0-only)
  • Kibana - Analyzes and visualizes log files. Some features require payment.
  • Logback - Robust logging library with interesting configuration options via Groovy.
  • Logbook - Extensible, open-source library for HTTP request and response logging.
  • Logstash - Tool for managing log files.
  • p6spy - Enables logging for all JDBC transactions without changes to the code.
  • SLF4J - Abstraction layer/simple logging facade.
  • tinylog - Lightweight logging framework with static logger class.
  • Tracer - Call tracing and log correlation in distributed systems.

Machine Learning

Tools that provide specific statistical algorithms for learning from data.
  • Apache Flink - Fast, reliable, large-scale data processing engine.
  • Apache Mahout - Scalable algorithms focused on collaborative filtering, clustering and classification.
  • Apache Spark - Data analytics cluster-computing framework.
  • DatumBox - Provides several algorithms and pre-trained models for natural language processing.
  • DeepDive - Creates structured information from unstructured data and integrates it into an existing database.
  • Deeplearning4j - Distributed and multi-threaded deep learning library.
  • H2O - Analytics engine for statistics over big data.
  • JSAT - Algorithms for pre-processing, classification, regression, and clustering with support for multi-threaded execution. (GPL-3.0-only)
  • Oryx 2 - Framework for building real-time, large-scale machine learning applications. Includes end-to-end applications for collaborative filtering, classification, regression, and clustering.
  • Smile - The Statistical Machine Intelligence and Learning Engine provides a set of machine learning algorithms and a visualization library.
  • Weka - Collection of algorithms for data mining tasks ranging from pre-processing to visualization. (GPL-3.0-only)


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


Everything else.
  • Codename One - Cross-platform solution for writing native mobile apps. (GPL-2.0-only WITH Classpath-exception-2.0)
  • CQEngine - Ultra-fast, SQL-like queries on Java collections.
  • Design Patterns - Implementation and explanation of the most common design patterns.
  • Failsafe - Simple failure handling with retries and circuit breakers.
  • FF4J - Feature Flags for Java.
  • FizzBuzz Enterprise Edition - No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)
  • J2ObjC - Java-to-Objective-C translator for porting Android libraries to iOS.
  • JavaCV - Java interface to OpenCV, FFmpeg, and more.
  • JavaX - Reinventing and extending Java with a focus on simplicity. (No explicit license)
  • JBake - Static website generator.
  • JBot - Framework for building chatbots. (GPL-3.0-only)
  • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
  • Jimfs - In-memory file system.
  • Joda-Money - Basic currency and money classes and algorithms not provided by the JDK.
  • JPad - Snippet runner.
  • Maven Wrapper - Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.
  • Membrane Service Proxy - An open-source, reverse-proxy framework written in Java.
  • MinimalFTP - Lightweight, small and customizable FTP server.
  • Modern Java - A Guide to Java 8 - Popular Java 8 guide.
  • Modernizer - Detect uses of legacy Java APIs.
  • Multi-OS Engine - An open-source, cross-platform engine to develop native mobile (iOS, Android, etc.) apps.
  • OpenRefine - Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.
  • PipelinR – Small utility library for using handlers and commands with pipelines.
  • Polyglot for Maven - Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
  • Smooks - Extensible framework for building applications that process data which means bindings, transformations, message processing and enrichment. (LGPL-3.0-only)
  • Togglz - Implementation of the Feature Toggles pattern.
  • TypeTools - Tools for resolving generic types.
  • XMLBeam - Processes XML by using annotations or XPath within code.
  • OctoLinker - Browser extension which allows to navigate through code on GitHub more efficiently.


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


Tools that monitor applications in production.
  • Automon - Combines the power of AOP with monitoring and/or logging tools.
  • LeakCanary - Memory leak detection.
  • Failsafe Actuator - Out of the box monitoring of Failsafe Circuit Breaker in Spring-Boot environment.
  • Glowroot - Open-source Java APM.
  • 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.
  • Instrumental
    - Real-time Java application performance monitoring. A commercial service with free development accounts.
  • JavaMelody - Performance monitoring and profiling.
  • Jaeger client - Jaeger client.
  • 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.
  • Jolokia - JMX over REST.
  • Kamon
    - Tool for monitoring applications running on the JVM.
  • Metrics - Expose metrics via JMX or HTTP and send them to a database.
  • Datadog
    - Modern monitoring & analytics.
  • nudge4j - Remote developer console from the browser for Java 8 via bytecode injection.
  • Pinpoint - Open-source APM tool.
  • Prometheus - Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.
  • SPM
    - Performance monitor with distributing transaction tracing for JVM apps.
  • Stagemonitor - Open-source performance monitoring and transaction tracing for JVM apps.
  • Sysmon - Lightweight platform monitoring tool for Java VMs.
  • zipkin - Distributed tracing system which gathers timing data needed to troubleshoot latency problems in microservice architectures.


For working with platform-specific native libraries.
  • JavaCPP - Provides efficient and easy access to native C++.
  • JNA - Work with native libraries without writing JNI. Also provides interfaces to common system libraries.
  • 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.
  • Beagle - Stored full-text search query engine.
  • CogCompNLP - Provides common annotators for plain text input. (Research and Academic Use License)
  • CoreNLP - Provides a set of fundamental tools for tasks like tagging, named entity recognition, and sentiment analysis. (GPL-3.0-or-later)
  • DKPro - Collection of reusable NLP tools for linguistic pre-processing, machine learning, lexical resources, etc.
  • Lingua - Natural language detection library, especially suited for short paragraphs of text.
  • LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.


Libraries for building network servers.
  • AkkaGRPC - Support for building streaming gRPC servers and clients on top of Akka Streams.
  • Comsat - Integrates standard Java web-related APIs with Quasar fibers and actors.
  • Dubbo - High-performance RPC framework.
  • 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.
  • Grizzly - NIO framework. Used as a network layer in Glassfish.
  • gRPC - RPC framework based on protobuf and HTTP/2.
  • KryoNet - Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.
  • MINA - Abstract, event-driven async I/O API for network operations over TCP/IP and UDP/IP via Java NIO.
  • Netty - Framework for building high-performance network applications.
  • Nifty - Implementation of Thrift clients and servers on Netty.
  • ServiceTalk - Framework built on Netty with APIs tailored to specific protocols and support for multiple programming paradigms.
  • sshj - Programatically use SSH, SCP or SFTP.
  • TLS Channel - Implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS.
  • Undertow - Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly. (LGPL-2.1-only)
  • urnlib - Represent, parse and encode URNs, as in RFC 2141. (GPL-3.0-only)


APIs that handle the persistence of objects.
  • 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.
  • Doma 2 - Database access framework that verifies and generates source code at compile time using annotation processing as well as native SQL templates called two-way SQL.
  • Ebean - Provides simple and fast data access.
  • EclipseLink - Supports a number of persistence standards: JPA, JAXB, JCA and SDO.
  • Hibernate - Robust and widely used, with an active community. (LGPL-2.1-only)
  • MyBatis - Couples objects with stored procedures or SQL statements.
  • SimpleFlatMapper - Simple database and CSV mapper.