JAXB: How to have my generated classes subclass some other outside class ?

Question

With my XJS and DTD, JAXB generates the following:
public class FraisMessage
    extends MarshallableRootElement
    implements RootElement
{ etc...I would like it to generate this instead:
public class FraisMessage extends MyOtherClass
    extends MarshallableRootElement
    implements RootElement
{ etc...MyOtherClass is another class outside the scope of JAXB
How do I do this ? What do I have to put in my XJS to get this ?

Answer 1

You cannot do that. TheJAVA language does not allow a class to "extend" more than one upper class.
Typically, the solution is to modify your architecture a little bit. Just use the "has a" relationship instead of "is a". That means something like that:public class MyFraisMessage
    extends MyOtherClass
    private FraisMessage message;
  etc...You write an extension "MyFraisMessage" of your upper class "MyOtherClass", which has the JAXB generated object as an attribute. This structure is often useful, when you think you would need multiple inheritance.