Migrating your Atmosphere 0.x to 0.9 new API - Atmosphere/atmosphere Wiki

Atmosphere 0.9 API changes

Starting with Atmosphere 0.9, both client and server have backward incompatible API changes. That means an application that was written against version lower than 0.9 may not work. If you are using atmosphere-jersey, you don't need to change anything.

atmosphere-runtime

So you need to remove the generic in your AtmosphereHandler to make it work again.

jQuery.atmosphere.js

atmosphere.js has been completely rewritten and has a few backward incompatibilities with the previous version:

All samples have been re-written and can be used to understand the changes. Take a look at the PubSub Client-Server or the infamous Chat Client-Server to realize how simple Atmosphere is!