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Realtime Client Server Framework for the JVM, supporting WebSockets with Cross-Browser Fallbacks
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Commercial support now available!

Thanks to the growing popularity of the framework, Commercial Support is now availaible via Want the project to stay alive? Please donate by visiting the and click on donate button!

Welcome to Atmosphere: The Asynchronous WebSocket/Comet Framework

The Atmosphere Framework contains client and server side components for building Asynchronous Web Application. The majority of popular frameworks are either supporting Atmosphere or supported natively by the framework. The Atmosphere Framework supports all majors Browsers and Servers

Follow us on Twitter or get the latest news here

Atmosphere transparently supports WebSockets, Server Side Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP.


Get started using this step by step tutorial

Official Documentation

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's Framework ships with many examples describing how to implements WebSockets, Server Side Events, Long Polling, Http Streaming and JSONP client's application. Take a look at this page to pick the best sample to starts with.

To use Atmosphere, add the following dependency:


Where atmosphere-module can be: jersey, runtime (main module), guice, jquery, redis, hazelcast, jms, jgroups or gwt. Our official release are available from Maven Central download.

IMPORTANT: Migrating 0.x to the new 1.0 API

Jump directly inside the code: WebSockets, Server Side 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!


Help this community by testing our next release




Atmosphere 1.0.15 is our official release, and our work in progress version is 2.0, targeted for end of End of July 2013

If you are interested, subscribe to our mailing list for more info! We are on under #atmosphere-comet



1.0 release: 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

0.9 release: 0.9.7 0.9.5 0.9.4 0.9.2/0.9.3 0.9.1 0.9.0

0.8 release: 0.8.6 0.8.5 0.8.4 0.8.3 0.8.2 0.8.0


Build Status

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