This is still unfixed in 9.1 b58g-fcs. And the workaround doesn't work. The only work around available is to reload the EJB. To reproduce:
1) Load EAR file that's a webservice
2) Restart glassfish
3) Goto web services -> click on the web service you just loaded -> click on 'test' button
and you get "Cannot load class....verify class presence in bundle"
[Message sent by forum member 'pnguyen42' (pnguyen42)]
http://forums.java.net/jive/thread.jspa?messageID=277041