When a generate my code with wsimport using a .net wsdl I've got extreme long exception classes like [servicename][operationname]FaultFaultFaultMessage.
I know how to rename each single exception but can I use a jaxb .xjb file to "template" all the exceptions at once?
You have two options:
Write a plugin for XJC.
Use XSLT or XQuery to generate an .xjb file from the WSDL. You can use more than one .xjb file per xjc invocation.
Good luck.