Hi, In case you don't know, the OSGi Alliance has chosen to use the Geronimo txmanager to build the Reference Implementation of Transaction in OSGi (RFC 98). If you are interested in RFC 98, there is an early draft specification avail off the OSGi Alliance home page (go to http://www.osgi.org/Main/HomePage and search for "Other 4.2 Early Draft Specifications").
Thanks Lin