# Modules Axon Framework consists of a number of modules that provide specific capabilities. Depending on the exact needs of your project, you will need to include one or more of these modules. There are currently two ways of obtaining the module binaries: either download the binaries from our website or preferably configure a repository for your build system ([Maven](http://maven.apache.org/), [Gradle](https://gradle.org/)). Axon modules are available on [Maven Central](https://search.maven.org/search?q=axonframework). ## Main modules Axon 'Main Modules' are the modules that have been thoroughly tested and are robust enough to use in demanding production environments. The maven `groupId` of all these modules is `org.axonframework`. Visit [Maven Central Repository](https://search.maven.org/search?q=g:org.axonframework) to copy coordinates for the version you need. > **Note** > > The [Axon Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-spring-boot-starter) module is the quickest start in to an Axon project as it will retrieve all the required modules/dependencies transitively. Alternatively, you can manually select individual modules for a customized configuration. | Module | Artifact Id | Group Id | Maven Central | | ------------------------------------------------------------------------------------------------------- | ------------------------ | ----------------- | :-----------------------------------------------------------------------: | | [Axon Messaging](/reference-guide-feature/axon-framework/modules.md#axon-messaging) | axon-messaging | org.axonframework | [available](https://search.maven.org/search?q=a:axon-messaging) | | [Axon Modeling](/reference-guide-feature/axon-framework/modules.md#axon-modeling) | axon-modelling | org.axonframework | [available](https://search.maven.org/search?q=a:axon-modelling) | | [Axon Event Sourcing](/reference-guide-feature/axon-framework/modules.md#axon-event-sourcing) | axon-eventsourcing | org.axonframework | [available](https://search.maven.org/search?q=a:axon-eventsourcing) | | [Axon Configuration](/reference-guide-feature/axon-framework/modules.md#axon-configuration) | axon-configuration | org.axonframework | [available](https://search.maven.org/search?q=a:axon-configuration) | | [Axon Test](/reference-guide-feature/axon-framework/modules.md#axon-test) | axon-test | org.axonframework | [available](https://search.maven.org/search?q=a:axon-test) | | [Axon Server Connector](/reference-guide-feature/axon-framework/modules.md#axon-server-connector) | axon-server-connector | org.axonframework | [available](https://search.maven.org/search?q=a:axon-server-connector) | | [Axon Spring](/reference-guide-feature/axon-framework/modules.md#axon-spring) | axon-spring | org.axonframework | [available](https://search.maven.org/search?q=a:axon-spring) | | [Axon Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-spring-boot-starter) | axon-spring-boot-starter | org.axonframework | [available](https://search.maven.org/search?q=a:axon-spring-boot-starter) | | [Axon Disruptor](/reference-guide-feature/axon-framework/modules.md#axon-disruptor) | axon-disruptor | org.axonframework | [available](https://search.maven.org/search?q=a:axon-disruptor) | | [Axon Metrics](/reference-guide-feature/axon-framework/modules.md#axon-metrics) | axon-metrics | org.axonframework | [available](https://search.maven.org/search?q=a:axon-metrics) | | [Axon Micrometer](/reference-guide-feature/axon-framework/modules.md#axon-micrometer) | axon-micrometer | org.axonframework | [available](https://search.maven.org/search?q=a:axon-micrometer) | | [Axon Legacy](/reference-guide-feature/axon-framework/modules.md#axon-legacy) | axon-legacy | org.axonframework | [available](https://search.maven.org/search?q=a:axon-legacy) | ### Axon Messaging This module contains all necessary components and building blocks to support command, event and query messaging. ### Axon Modeling This module contains the necessary components to create domain models, like Aggregates and Sagas. ### Axon Event Sourcing This module contains all necessary infrastructure components to support Event Sourcing, Command and Query Models. ### Axon Test This module contains test fixtures that you can use to test Axon based components, such as your Command Handlers, Aggregates and Sagas. You typically do not need this module at runtime and will only need to be added to the classpath for running tests. ### Axon Configuration This module contains all the necessary components to configure an Axon application. ### Axon Server Connector This module provides infrastructure components that connect to Axon Server. ### Axon Spring This module allows Axon Framework components to be configured in the Spring Application context. It also provides a number of building block implementations specific to Spring Framework, such as an adapter for publishing and retrieving Axon Events on a Spring Messaging Channel. ### Axon Spring Boot Starter This module provides Spring Boot auto-configuration for your project. It is by far the easiest option to get started as it automatically configures all Axon components. It is explained in more details [here](/reference-guide-feature/axon-framework/spring-boot-integration.md). ### Axon Disruptor This module contains a specific CommandBus and Command Handling solution based on the Disruptor paradigm. ### Axon Metrics This module provides basic implementations based on Coda Hale to collect the monitoring information. ### Axon Micrometer This module provides basic implementations based on Micrometer to collect the monitoring information. [Micrometer](https://micrometer.io/) is a dimensional-first metrics collection facade whose aim is to allow you to time, count, and gauge your code with a vendor neutral API. ### Axon Legacy This module contains components that enable migration of older Axon projects to use the latest Axon version. ## Extension modules Besides main modules, there are several extension modules which complement Axon Framework. They address distribution concerns of Axon Framework towards non-Axon Server solutions. The maven `groupId` of these extensions starts with `org.axonframework.extensions.*`. Visit [Maven Central Repository](https://search.maven.org/search?q=axonframework%20extensions) to copy coordinates for the version you need. | Module | Artifact Id | Group Id | Maven Central | GitHub | | --------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------ | ---------------------------------------- | ------------------------------------------------------------------------------------- | :-----------------------------------------------------------------: | | [Axon AMQP](/reference-guide-feature/axon-framework/modules.md#axon-amqp) | axon-amqp | org.axonframework.extensions.amqp | [available](https://search.maven.org/search?q=a:axon-amqp) | [available](https://github.com/AxonFramework/extension-amqp) | | [Axon AMQP Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-amqp-spring-boot-starter) | axon-amqp-spring-boot-starter | org.axonframework.extensions.amqp | [available](https://search.maven.org/search?q=a:axon-amqp-spring-boot-starter) | [available](https://github.com/AxonFramework/extension-amqp) | | [Axon CDI](/reference-guide-feature/axon-framework/modules.md#axon-cdi) | axon-cdi | org.axonframework.extensions.cdi | [available](https://search.maven.org/search?q=a:axon-cdi) | [available](https://github.com/AxonFramework/extension-cdi) | | [Axon JGroups](/reference-guide-feature/axon-framework/modules.md#axon-jgroups) | axon-jgroups | org.axonframework.extensions.jgroups | [available](https://search.maven.org/search?q=a:axon-jgroups) | [available](https://github.com/AxonFramework/extension-jgroups) | | [Axon JGroups Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-jgroups-spring-boot-starter) | axon-jgroups-spring-boot-starter | org.axonframework.extensions.jgroups | [available](https://search.maven.org/search?q=a:axon-jgroups-spring-boot-starter) | [available](https://github.com/AxonFramework/extension-jgroups) | | [Axon Kafka](/reference-guide-feature/axon-framework/modules.md#axon-kafka) | axon-kafka | org.axonframework.extensions.kafka | [available](https://search.maven.org/search?q=a:axon-kafka) | [available](https://github.com/AxonFramework/extension-kafka) | | [Axon Kafka Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-kafka-spring-boot-starter) | axon-kafka-spring-boot-starter | org.axonframework.extensions.kafka | [available](https://search.maven.org/search?q=a:axon-kafka-spring-boot-starter) | [available](https://github.com/AxonFramework/extension-kafka) | | [Axon Kotlin](/reference-guide-feature/axon-framework/modules.md#axon-kotlin) | axon-kotlin | org.axonframework.extensions.kotlin | [available](https://search.maven.org/search?q=a:axon-kotlin) | [available](https://github.com/AxonFramework/extension-kotlin) | | [Axon Mongo](/reference-guide-feature/axon-framework/modules.md#axon-mongo) | axon-mongo | org.axonframework.extensions.mongo | [available](https://search.maven.org/search?q=a:axon-mongo) | [available](https://github.com/AxonFramework/extension-mongo) | | [Axon Reactor](/reference-guide-feature/axon-framework/modules.md#axon-reactor) | axon-reactor | org.axonframework.extensions.reactor | [available](https://search.maven.org/search?q=a:axon-reactor) | [available](https://github.com/AxonFramework/extension-reactor) | | [Axon Spring Cloud](/reference-guide-feature/axon-framework/modules.md#axon-spring-cloud) | axon-springcloud | org.axonframework.extensions.springcloud | [available](https://search.maven.org/search?q=a:axon-springcloud) | [available](https://github.com/AxonFramework/extension-springcloud) | | [Axon Spring Cloud Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-spring-cloud-spring-boot-starter) | axon-springcloud-spring-boot-starter | org.axonframework.extensions.springcloud | [available](https://search.maven.org/search?q=a:axon-springcloud-spring-boot-starter) | [available](https://github.com/AxonFramework/extension-springcloud) | | [Axon Tracing](/reference-guide-feature/axon-framework/modules.md#axon-tracing) | axon-tracing | org.axonframework.extensions.tracing | [available](https://search.maven.org/search?q=a:axon-tracing) | [available](https://github.com/AxonFramework/extension-tracing) | | [Axon Tracing Spring Boot Starter](/reference-guide-feature/axon-framework/modules.md#axon-tracing-spring-boot-starter) | axon-tracing-spring-boot-starter | org.axonframework.extensions.tracing | [available](https://search.maven.org/search?q=a:axon-tracing-spring-boot-starter) | [available](https://github.com/AxonFramework/extension-tracing) | ### Axon AMQP This module provides components that allow you leverage an AMQP-based message broker as an Event Message distribution mechanism. This allows for guaranteed-delivery, even when the Event Handler node is temporarily unavailable. ### Axon AMQP Spring Boot Starter This module provides Spring auto-configuration on top of the `axon-amqp` module. ### Axon CDI This module provides support for Contexts and Dependency Injection (CDI) for the Java EE platform. ### Axon JGroups This module provides integration with JGroups for command distribution. [JGroups](http://www.jgroups.org/) should be regarded as a reliable messaging toolkit. ### Axon JGroups Spring Boot Starter This module provides Spring auto-configuration on top of the `axon-jgroups` module ### Axon Kafka This module provides integration with Kafka for event distribution. As such it plays a similar role as the [Axon AMQP](/reference-guide-feature/axon-framework/modules.md#axon-amqp) extension and thus is **not** a replacement Event Storage mechanism. [Kafka](https://kafka.apache.org/) is a distributed message streaming platform. ### Axon Kafka Spring Boot Starter This module provides Spring auto-configuration on top of the `axon-kafka` module. ### Axon Kotlin This module provides a set of reified operations, among others, to allow a cleaner [Kotlin](https://kotlinlang.org/) coding experience when using Axon. ### Axon Reactor This module provides integration with [Project Reactor](https://projectreactor.io/). ### Axon Mongo This module provides event and saga store implementations that store event streams and sagas in a MongoDB database. [MongoDB](https://www.mongodb.com/) is a document based NoSQL database. ### Axon Spring Cloud This module provides integration with Spring Cloud for command distribution. [Spring Cloud](https://spring.io/projects/spring-cloud) provides an API for common distributed system patterns. ### Axon Spring Cloud Spring Boot Starter This module provides Spring auto-configuration on top of the `axon-springcloud` module ### Axon Tracing This module provides support for distributed tracing of Axon applications. The [Open Tracing](https://opentracing.io/) standard is used to provide the tracing capabilities. ### Axon Tracing Spring Boot Starter This module provides Spring auto-configuration on top of the `axon-tracing` module --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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