Realtime Client Server Framework for the JVM, supporting WebSockets with Cross-Browser Fallbacks
Switch branches/tags
default/master atmosphere-project-3.0.0-beta1 atmosphere-project-3.0.0-alpha2 atmosphere-project-3.0.0-alpha1 atmosphere-project-2.5.2 atmosphere-project-2.5.1 atmosphere-project-2.5.0 atmosphere-project-2.4.32 atmosphere-project-2.4.31 atmosphere-project-2.4.30 atmosphere-project-2.4.29 atmosphere-project-2.4.28 atmosphere-project-2.4.27 atmosphere-project-2.4.26 atmosphere-project-2.4.25 atmosphere-project-2.4.24 atmosphere-project-2.4.23 atmosphere-project-2.4.22 atmosphere-project-2.4.21 atmosphere-project-2.4.20 atmosphere-project-2.4.19 atmosphere-project-2.4.18 atmosphere-project-2.4.17 atmosphere-project-2.4.16 atmosphere-project-2.4.15 atmosphere-project-2.4.14 atmosphere-project-2.4.13 atmosphere-project-2.4.12 atmosphere-project-2.4.11 atmosphere-project-2.4.10 atmosphere-project-2.4.9 atmosphere-project-2.4.8 atmosphere-project-2.4.7 atmosphere-project-2.4.6 atmosphere-project-2.4.5 atmosphere-project-2.4.4 atmosphere-project-2.4.3 atmosphere-project-2.4.2 atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project-2.4.1 atmosphere-project- atmosphere-project- atmosphere-project- atmosphere-project-2.4.0 atmosphere-project-2.4.0-RC7 atmosphere-project-2.4.0-RC6 atmosphere-project-2.4.0-RC5 atmosphere-project-2.4.0-RC4 atmosphere-project-2.4.0-RC3 atmosphere-project-2.4.0-RC2 atmosphere-project-2.4.0-RC1 atmosphere-project-2.3.10 atmosphere-project-2.3.9 atmosphere-project-2.3.8 atmosphere-project-2.3.7 atmosphere-project-2.3.6 atmosphere-project-2.3.5 atmosphere-project-2.3.4 atmosphere-project-2.3.3 atmosphere-project-2.3.2 atmosphere-project-2.3.1 atmosphere-project-2.3.0 atmosphere-project-2.3.0-RC6 atmosphere-project-2.3.0-RC5 atmosphere-project-2.3.0-RC4 atmosphere-project-2.3.0-RC3 atmosphere-project-2.3.0-RC2 atmosphere-project-2.3.0-RC1 atmosphere-project-2.2.13 atmosphere-project-2.2.12 atmosphere-project-2.2.11 atmosphere-project-2.2.10 atmosphere-project-2.2.9 atmosphere-project-2.2.8 atmosphere-project-2.2.7 atmosphere-project-2.2.6 atmosphere-project-2.2.5 atmosphere-project-2.2.4 atmosphere-project-2.2.3 atmosphere-project-2.2.2 atmosphere-project-2.2.1 atmosphere-project-2.2.0 atmosphere-project-2.2.0-RC3 atmosphere-project-2.2.0-RC2 atmosphere-project-2.2.0-RC1 atmosphere-project-2.1.14 atmosphere-project-2.1.13 atmosphere-project-2.1.12 atmosphere-project-2.1.11 atmosphere-project-2.1.10 atmosphere-project-2.1.9 atmosphere-project-2.1.8 atmosphere-project-2.1.7
Nothing to show
Clone or download
Latest commit 4b29a26 Nov 9, 2018


Welcome to Atmosphere: The Event Driven Framework supporting WebSocket and HTTP

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 Only pull request for that branch will be accepted.


Our next major revision 4.0 is developped under Atmosph4rX.

Commercial support

Commercial Support is available via

To use Atmosphere, add the following dependency:

         <version>2.4.32 (JDK 8 and lower) | 2.5.2 (JDK 8+)</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

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

Top Z

Atmosphere and JDK Versions

Atmosphere 2.5.x requires JDK 8 or 11. Atmosphere 2.4.x requires JDK 1.7 or newer


2.5.x release: [2.5.2] ( 2.5.0

2.4.x release: [2.4.32] ( 2.4.30

End Of Life Versions (go to for commercial support)

2.4.x release: 2.4.29 2.4.27 2.4.26 2.4.24 2.4.23 2.4.22 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

2.3.x release: 2.3.10 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: 2.2.13 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: 2.1.14 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: 2.0.12 2.0.11 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: 1.0.21 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


@Copyright 2008-2018