JAXB unmarshall to multiple pojo's

I was trying to figure out if it is possible to unmarshall an xml element to multiple pojos. for example:

for xml:

<type>
  <id>1</id>
  <cost>12</cost>
  <height>15</height>
  <width>13</width>
  <depth>77</depth>
</type>

Item class

@XmlAccessorType(XmlAccessType.PROPERTY)
@XmlRootElement(name="type")
public class Item {
  private Integer id;
  private Double cost;

  @XmlElement(name="id")
  public Integer getId(){
    return id;
  }

  @XmlElement(name="cost")
  public Double getCost(){
    return cost
  }
}

ItemDimensions Class

@XmlAccessorType(XmlAccessType.PROPERTY)
@XmlRootElement(name="type")
public class ItemDimensions {
  private Integer height;
  private Integer width;
  private Integer depth;

  @XmlElement(name="height")
  public Integer getHeight(){
    return height;
  }

  @XmlElement(name="width")
  public Integer getWidth(){
    return width;
  }

  @XmlElement(name="depth")
  public Integer getDepth(){
    return depth;
  }
}

I have tried to accomplish something similar using a number o开发者_StackOverflow中文版f JAXB mappings generated by Netbeans 6.9 and a number of test classes but have gotten nowhwere. Does anyone know if this is something that can be done without any intermediary objects?

---

You could use the @XmlPath extension in EclipseLink JAXB (MOXy) to accomplish this use case (I'm the MOXy tech lead):

Root

JAXB requires a single object to unmarshal, we will introduce a class to fulfill this role. This class will have fields corresponding to the two Objects you wish to unmarshal annotated with the self XPath: @XmlPath(".")

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;

import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement(name="type")
@XmlAccessorType(XmlAccessType.FIELD)
public class Root {

    @XmlPath(".")
    private Item item;

    @XmlPath(".")
    private ItemDimensions itemDimensions;

}

ItemDimensions

You annotate this class normally. In your example you annotate the properties, but only provide getters. This will cause JAXB to think that those are write only mappings.

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class ItemDimensions {

    private Integer height;
    private Integer width;
    private Integer depth;

}

Item

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Item {

    private Integer id;
    private Double cost;

}

Demo

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class Demo {

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

        Unmarshaller u = jc.createUnmarshaller();
        Object o = u.unmarshal(new File("input.xml"));

        Marshaller m = jc.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        m.marshal(o, System.out);
    }

}

jaxb.properties

To use MOXy as your JAXB implementation, you must provide a file named jaxb.properties in with your domain objects with the following entry:

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