The Atmosphere Framework has both client and server ready to use components. The majority of popular frameworks are either supporting Atmosphere or supported natively by the framework(**).
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<dependency>
<groupId>org.atmosphere</groupId>
<artifactId>atmosphere-{atmosphere-module}</artifactId>
<version>0.8.6</version>
</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.
Take a look at the PubSub ClientServer or the Chat ClientServer to realize how simple Atmosphere is!
Writing a REST over WebSocket/Comet apps using JQuery
Which Atmosphere API should I use for my project?
White Paper PDF (a little bit old)
Latest Presentation - Writing highly scalable WebSocket using the Atmosphere Framework
Browse Javadoc
To quickly see what Atmosphere can do with WebSocket and Comet, and If you want to play with Redis, Hazelcast, ActiveMQ(JMS) or XMPP(Gmail), download our JQueryPubSub sample and uncomments the appropriate technology and rebuild, or drop the atmosphere-{name}.jar under your WEB-INF/lib to enabled it automatically pom.xml
For SNAPSHOT, you'll have to add the Sonatype repo to your settings in order to be able to access the snapshot builds Browse the artifact
Several Samples are available Download the sample, rename the file without the maven version
Atmosphere 0.8.6 is our official release, and our work in progress version is 0.9, targeted for end of Mid April 2012
If you are interested, subscribe to our mailing list for more info! We are on irc.freenode.net under #atmosphere-comet
(**) The list include Jersey, GWT, Wicket, Vaadin, JSF, Scalatra, Play!, Grails and more. All JVM based languages are supported, an massive scalability in natively build in and supported by JGroups, Hazelcast, ActiveMQ, Redis and XMPP based server.