Oracle promotes to invoke this web service using the test end point available at http://<your-server>:<your-port>/soa-infra/ This cause a little bit of frustration to me since this end point did not show the web service payload attributes unless I knew I implemented them.
Checking forth and back, reimplementing the web service again and again, I finally had the idea to check in Enterprise Manager ... and voila: everything there!
I don't really know why the test end point at soa-infra doesn't do the job any more or even if others faced the problem. But if ever, you run into it, you'll at least have a workaround by now.
