Hi!
I am not familiar with Axis 1.1 or WebLogic, but I guess it is differences in the implementations that cause differences in the generated code.
For instance, check the section "Unsupported Features" at this link:
http://e-docs.bea.com/wls/docs81/webserv/overview.html
Can't you use some more recent web service stack?
JAXB has support for all XML schema features, which the XML serialization mechanism in JAX-RCP does not have.
Best wishes!