I just ran across an older link that described a proposed API for an asynchronous invocation to Axis:
A few things stood out:
1. It's very JMS.
2. There is no mention in the document about JAXM.
3. Later discussions looked like they were moving along alternative paths...
Mr. Snell appears to have already hacked something up:
Smart guys, I'm sure they'll nail it. I figure that eventually there will be a JMS api, a JAXM api and a couple more...