MTOM support has been there since JAX-WS 2.0 EA2 release.
There are 2 ways you can try it - join the
jax-ws project on
java.net and get the jaxws
distribution or you can install
JWSDP 2.0.
By default MTOM encoding is disabled. To enable MTOM on a service all you need to do is to add enable-mtom attribute on the endpoint descriptor element.
Here is a sample descriptor from the mtom...
