question on code generation with regard to non-alphabetic character in xml element name

[Jerry Wang]

I am using xmlbean to generate code from wsdl, the issue I am facing is that
names of some xml elements have special character like "_"(for example
<first_name>).
and the getter generated is getFirstName().
can I somehow force the method generated to have exact xml tag name like
getFirst_Name()?
I really do not want to do mapping,just too much over head.
Thanks
Jerry