jaxb wrapper example for non-list elements

JaxbTest.java

package com.test.ws;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

public class JaxbTest {

  public static void main(String[] args) throws JAXBException {
    final ExampleObject obj = new ExampleObject();
    obj.setObj1(new InnerObject("id1", "code1"));
    obj.setObj2(new InnerObject("id2", "code2"));

    final Marshaller marshaller = JAXBContext.newInstance(ExampleObject.class).createMarshaller();
    marshaller.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE );
    marshaller.marshal(obj, System.out);
  }
}

@XmlRootElement
class ExampleObject{
  private InnerObject obj1;
  private InnerObject obj2;

  @XmlTransient
  public InnerObject getObj1() {
    return obj1;
  }

  public void setObj1(InnerObject obj1) {
    this.obj1 = obj1;
  }

  @XmlTransient
  public InnerObject getObj2() {
    return obj2;
  }

  public void setObj2(InnerObject obj2) {
    this.obj2 = obj2;
  }

  private static class EntityWrapper {
    @XmlElement(name = "company")
    private InnerObject entity;

    EntityWrapper() { }

    private EntityWrapper(InnerObject entity) {
      this.entity = entity;
    }

    public InnerObject getEntity() {
      return entity;
    }
  }

  @XmlElement(name = "agent")
  private void setEntity1(EntityWrapper entityWrapper) {
    obj1 = entityWrapper.getEntity();
  }

  @XmlElement(name = "office")
  private void setEntity2(EntityWrapper entityWrapper) {
    obj2 = entityWrapper.getEntity();
  }

  private EntityWrapper getEntity1(){
    return new EntityWrapper(obj1);
  }

  private EntityWrapper getEntity2(){
    return new EntityWrapper(obj2);
  }
}

@XmlAccessorType(XmlAccessType.FIELD)
class InnerObject{
  private String id;
  private String code;

  InnerObject(String id, String code) {
    this.id = id;
    this.code = code;
  }
}

result:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<exampleObject>
    <agent>
        <company>
            <id>id1</id>
            <code>code1</code>
        </company>
    </agent>
    <office>
        <company>
            <id>id2</id>
            <code>code2</code>
        </company>
    </office>
</exampleObject>