Jetty integration is explained in the Jetty docs available here:
Also, Atomikos TransactionsEssentials®
is used in Hightide, a versioned distribution of Jetty: http://www.webtide.com/resources/downloads.jsp
Webtide are the main developers of Jetty, the highly regarded open source Java web container and are experts in implementing scalable Web 2.0 solutions using Jetty and other Ajax technology. Webtide has also sponsored development of the JMS topic functionality in Atomikos TransactionsEssentials®.