CODEWITHSUNDEEP
inheritancejaxb
user1877242
user1877242

Reputation: 21

JAXB unmarshalling issue

I am having issues unmarshalling XML using the jaxb2-maven-plugin(1.5). Basically I have in my XML document, an element A of type B, which is a base domain class, Class A. Type B is a domain class that extends A. Now, I can see the XML coming in with the element A with xsi:type="B". But when I unmarshall it, it still returns a Java object of type A. How can I resolve this? I need to be able to get an object of type B. As long, as the XML has the notation xsi:type, it should be able to unmarshall it, correct. Or do I still need XMLAdapters, etc?

Thanks a lot.

Upvotes: 2

Views: 306

Answers (1)

bdoughan
bdoughan

Reputation: 149047

There are a couple things to check:

  • Is your JAXBContext aware of the B class? You can include in the classes used to create the JAXBContext or add @XmlSeeAlso({B.class}) on the A class.
  • Is the name of the type corresponding to the B class B? By default it will be b. You can use the @XmlType annotation to specify a name.

A

package forum13712986;

import javax.xml.bind.annotation.XmlSeeAlso;

@XmlSeeAlso({B.class})
public class A {

}

B

package forum13712986;

import javax.xml.bind.annotation.XmlType;

@XmlType(name="B") // Default name is "b"
public class B extends A {

}

Demo

package forum13712986;

import java.io.StringReader;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(A.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        String xml = "<A xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:type='B'/>";
        StreamSource source = new StreamSource(new StringReader(xml));
        JAXBElement<A> jaxbElement = unmarshaller.unmarshal(source, A.class);

        System.out.println(jaxbElement.getValue().getClass());
    }

}

Output

class forum13712986.B

Upvotes: 2

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