@XmlElementWrapper for unwrapped collections

Question

The docs state the the @XmlElementWrapper annotation can be used for 'unwrapped' or 'wrapped' collections.

http://docs.oracle.com/javaee/5/api/javax/xml/bind/annotation/XmlElementWrapper.html

How do you configure it to produce an unwrapped collection?

Answer 1

If you include @XmlElementWrapper it will add a grouping element:

@XmlElementWrapper
@XmlElement(name="foo")
public List<Foo> getFoos() {
    return foos;
}

<root>
    <foos>
        <foo/>
        <foo/>
    </foos>
</foo>

and if you omit it, then it won't.

@XmlElement(name="foo")
public List<Foo> getFoos() {
    return foos;
}

<root>
    <foo/>
    <foo/>
</foo>

For More Information

• http://blog.bdoughan.com/2012/12/jaxb-representing-null-and-empty.html