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Welcome to Atmosphere: The Asynchronous WebSocket/AJAX Framework

The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. Atmosphere transparently supports WebSockets, Server Sent Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP.

The Atmosphere Framework Stack consists of:

Atmosphere Stack

The Atmosphere Framework Stack works on all Servlet based servers, Spring Boot and frameworks like Netty, Play! Framework and Vert.x. We support a variety of extensions like Apache Kafka, Hazelcast, RabbitMQ, Redis and many more.

Atmosphere's Java/Scala/Android Client is called wAsync.

Main development branch is atmosphere-2.4.x. Upcoming Atmosphere release is on master

Commercial support

Commercial Support is available via

To use Atmosphere, add the following dependency:

         <version> 2.4.21 | 3.0.0-beta1 </version>

atmosphere-module can be: runtime (main module), jersey, spring, kafka, guice, redis, hazelcast, jms, rabbitmq, jgroups etc. Our official releases are available from Maven Central download.


Get started using this step by step tutorial.

Official Documentation

Easiest way to learn Atmosphere is by trying a sample.

Our Wiki contains several tutorials for getting started as well as FAQ. You can also browse the framework's Javadoc for Server Components, and atmosphere.js for Client Components.

Quick Start

The Atmosphere Framework ships with many examples describing how to implement WebSockets, Server-Sent Events, Long-Polling, HTTP Streaming and JSONP client applications. Take a look at this page to pick the best sample to start with.

Jump directly inside the code: WebSockets, Server-Sent Events (SSE), Long-Polling, JSONP and HTTP Streaming!

Take a look at the PubSub Client-Server or the infamous Chat Client-Server to realize how simple Atmosphere is!


Follow us on Twitter

Roadmap to Atmosphere 3.0.0 (May 2018)


If you are interested, subscribe to our mailing list for more info!.

Top Z

Atmosphere and JDK Versions

Atmosphere 2.4.x requires JDK 1.7 or newer

Atmosphere 3.0.0 & 2.5.x (both alpha) requires JDK 1.8


2.4.x release: 2.4.19 2.4.18 2.4.17 2.4.16 2.4.13 2.4.12 2.4.11 2.4.9 2.4.8 2.4.7 2.4.6 2.4.5 2.4.4 2.4.3 2.4.2 2.4.1 2.4.0

End Of Life Versions (go to for commercial support)

2.3.x release: 2.3.8 2.3.7 2.3.6 2.3.5 2.3.4 2.3.3 2.3.2 2.3.1 2.3.0

2.2.x release: 2.2.10 2.2.9 2.2.8 2.2.7 2.2.6 2.2.5 2.2.4 2.2.3 2.2.2 2.2.1 2.2.0

2.1.x release: 2.1.12 2.1.11 2.1.10 2.1.9 2.1.8 2.1.7 2.1.6 2.1.5 2.1.4 2.1.2 2.1.1 2.1.0

2.0.x release: 2.0.10 2.0.9 2.0.8 2.0.7 2.0.6 2.0.5 2.0.4 2.0.3 [2.0.2] ( 2.0.1

1.0 release: 1.0.19 1.0.17 1.0.16 1.0.14 1.0.13 1.0.11 1.0.10 1.0.8 1.0.6 1.0.5 1.0.4 1.0.3 1.0.2 1.0.1 1.0


Build Status

Build Status


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