Description Blaise Doughan 2010-07-29 10:44:24 EDT

The following code produces:

<zoo><Dog/><Cat/></zoo>

but should produce:

<zoo><dog/><cat/></zoo>


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

@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);
        System.out.println(jc);
        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 {
    }
}