Hello,
I am working through the example for mapping interfaces with
annotations located here:
https://jaxb.dev.java.net/guide/Mapping_interfaces.html
But I have found that it does not work. When I have a field such as:
@XmlAnyElement
private List<Animal> animals;
Every thing works correctly. But when I add a wrapper element, such as:
@XmlElementWrapper
@XmlAnyElement
private List<Animal> animals;
I find that the Java object marshals correctly, but when I unmarshal
the document created by marshaling, my list is empty. I have posted
below the code to demonstrate this problem.
Am I doing something wrong, or is this a bug? I have tried it will
version 2.1.12 and 2.2-ea with the same result.
-- Joe
@XmlRootElement
class Zoo {
@XmlElementWrapper
@XmlAnyElement(lax = true)
private List<Animal> animals;
public static void main(String[] args) throws Exception {
Zoo zoo = new Zoo();
zoo.animals = new ArrayList<Animal>();
zoo.animals.add(new Dog());
zoo.animals.add(new Cat());
JAXBContext jc = JAXBContext.newInstance(Zoo.class, Dog.class, Cat.class);
Marshaller marshaller = jc.createMarshaller();
ByteArrayOutputStream os = new ByteArrayOutputStream();
marshaller.marshal(zoo, os);
System.out.println(os.toString());
Unmarshaller unmarshaller = jc.createUnmarshaller();
Zoo unmarshalledZoo = (Zoo) unmarshaller.unmarshal(new
ByteArrayInputStream(os.toByteArray()));
if (unmarshalledZoo.animals == null) {
System.out.println("animals was null");
} else if (unmarshalledZoo.animals.size() == 2) {
System.out.println("it worked");
} else {
System.out.println("failed!");
}
}
public interface Animal {}
@XmlRootElement
public static class Dog implements Animal {}
@XmlRootElement
public static class Cat implements Animal {}
}