Hi Florian,
I am taking the generated / xml-annotated code and running it through a wsdl2java tool. It is complaining that Soap RPC can't handle xml attributes. I changed line 221 in my DomainEntityJPA2Annotation.vm from:
@XmlAttribute $!xmlElementValue
to:
@XmlElement $!xmlElementValue
I wonder if you would provide a configuration parameter what would allow that change to be selected if desired.