JAXB marshaller no-arg default constructor

Question

I would like to marshalling a java object from a java library.

When marshalling a java object using JAXB marschaller, I have got a problem:

class A does not have a no-arg default constructor

I used a Java Decomplier to check the class a implementation, it is like this:

public final class AImpl
  implements A

That means I can not extends class AImpl.

So How can I fix the problem with no-arg default constructor?

Answer 1

You can use XmlAdapter for this use case. For an example see:

• http://bdoughan.blogspot.com/2010/12/jaxb-and-immutable-objects.html
• http://bdoughan.blogspot.com/2010/07/xmladapter-jaxbs-secret-weapon.html

Answer 2

How do you know values that should be passed to that constructor then?

I think you will need to override Binder class to unmarshall objects by yourself.