Java Code to XML/XSD without using Annotation

Question

I need to marshall and unmarshall a Java class to XML. The class in not owned by me, that I cannot add anotations so that I can use JAXB.

Is there a good way to conv

Answer 1

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.

DOMAIN MODEL

I will use the following domain model for this answer. Note how there are no JAXB annotations on the model.

Customer

package forum11693552;

import java.util.*;

public class Customer {

    private String firstName;
    private String lastName;
    private List phoneNumbers = new ArrayList();

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public List getPhoneNumbers() {
        return phoneNumbers;
    }

    public void setPhoneNumbers(List phoneNumbers) {
        this.phoneNumbers = phoneNumbers;
    }

}

PhoneNumber

package forum11693552;

public class PhoneNumber {

    private String type;
    private String number;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

}

---

OPTION #1 - Any JAXB (JSR-222) Implementation

JAXB is configurartion by exception, this means you only need to add annotations where you want the mapping behaviour to differ from the default. Below is a link to an example demonstrating how to use any JAXB impl without annotations:

Demo

package forum11693552;

import javax.xml.bind.*;
import javax.xml.namespace.QName;

public class Demo {

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

        Customer customer = new Customer();
        customer.setFirstName("Jane");
        customer.setLastName("Doe");

        PhoneNumber workPhone = new PhoneNumber();
        workPhone.setType("work");
        workPhone.setNumber("555-1111");
        customer.getPhoneNumbers().add(workPhone);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        JAXBElement rootElement = new JAXBElement(new QName("customer"), Customer.class, customer);
        marshaller.marshal(rootElement, System.out);
    }

}

Output

    Jane
    Doe
    
        555-1111
        work
    

For More Information

• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/TheBasics

---

OPTION #2 - EclipseLink JAXB (MOXy)'s External Mapping Document

If you do want to customize the mappings, then you may be interested in MOXy's external mapping document extension. A sample mapping document looks like the following:

oxm.xml

jaxb.properties

To enable MOXy as your JAXB provider you need to include a file called jaxb.properties in the same package as your domain model with the following entry (see: http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html):

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

Demo

When using EclipseLink MOXy as your JAXB provider (see), you can leverage the external mapping document when you bootstrap your JAXBContext

package forum11693552;

import java.util.*;
import javax.xml.bind.*;
import javax.xml.namespace.QName;
import org.eclipse.persistence.jaxb.JAXBContextFactory;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map properties = new HashMap(1);
        properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, "forum11693552/oxm.xml");
        JAXBContext jc = JAXBContext.newInstance(new Class[] {Customer.class}, properties);

        Customer customer = new Customer();
        customer.setFirstName("Jane");
        customer.setLastName("Doe");

        PhoneNumber workPhone = new PhoneNumber();
        workPhone.setType("work");
        workPhone.setNumber("555-1111");
        customer.getPhoneNumbers().add(workPhone);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        JAXBElement rootElement = new JAXBElement(new QName("customer"), Customer.class, customer);
        marshaller.marshal(rootElement, System.out);
    }

}

Output

   Jane
   Doe
   555-1111

For More Information

• http://blog.bdoughan.com/2010/12/extending-jaxb-representing-annotations.html
• http://blog.bdoughan.com/2012/04/extending-jaxb-representing-metadata-as.html