What I had to do is to wrap jaxb:globalBindings
with another jaxb:bindings
.
<jaxb:bindings version="2.0"
xmlns:jaxb="http://java.sun.com/xml/ns/jaxb">
<jaxb:bindings>
<jaxb:globalBindings generateElementProperty="false"/>
</jaxb:bindings>
</jaxb:bindings>
Now everything is working, there is no JAXBElement<String>
generated anymore.