Support for WS-AT 1.0 is provided by the JBoss Transactions project. It also supports WS-BA 1.0. See the JBossTS Project page for details:
http://labs.jboss.com/jbosstm/
Follow: the web services link for an overview of Web Services Transactions; and the documentation link for the Web Services (XTS) Programmers Guide.
I just ran theJBossTS XTS demo application in JBossAS 5.0.0.Beta4 using the the JBossWS-Metro release. The demo employs JaxWS to invoke 3 different web services within the scope of either an atomic transaction or a business activity. Both protocols worked fine.
