Jaxb: How to replace a class/binding in given object tree while unmarshalling

Question

I have a given set of classes to unmarshall a xml into an object tree. Now I get a extended xml and want to replace one class in the object tree with an extended version.

Answer 1

A similar topic is discussed here: JAXB inheritance, unmarshal to subclass of marshaled class

With jackson 2.8.6 you can just write something like

@Test
public void readXmlToSelfDefinedPojo2() throws Exception {

    ObjectMapper mapper = new XmlMapper();
    ExtAdress pojo = mapper.readValue(
                    Thread.currentThread().getContextClassLoader().getResourceAsStream("52109685.xml"),
                    ExtAdress.class);
    System.out.println(toString(pojo));
}

public String toString(Object obj) throws JsonGenerationException, JsonMappingException, IOException{
    StringWriter w = new StringWriter();
    new ObjectMapper().configure(SerializationFeature.INDENT_OUTPUT, true).writeValue(w, obj);
    return w.toString();
}

It will print

{
  "systemId" : "on the 4",
  "type" : "test"
}

for

  
on the 4
give me some more
test

    James
    Brown
    

        Funky
        Town
        HOME 
    

and

@JsonIgnoreProperties(ignoreUnknown = true)
public class ExtAdress extends Adress {
    public String type;
    public ExtAdress() {
    }
}

and

@JsonIgnoreProperties(ignoreUnknown = true)
public class Adress {
    public String systemId;

    public Adress() {
    }
}