How to make relatively simple change in XML mapping

[KARR, DAVID (ATTCINW)]

I have a relatively simple prototype using the REST features of CXF, and
using JAXB out of the box to marshal a response to XML and JSON.  This
is working fine.

I'm now trying to experiment with simple changes to the structure of the
marshaled XML, using "@Xml..." annotations.  I assume that's what those
are for.  I tried asking about this on the Metro JAXB web forum, but I
got no response.  Is there another good forum for asking questions about
this?

Initially, my code looks like this:

@XmlRootElement(name = "Item")
public class Item {
  private String  id;
  private String  title;
  private String  description;
  private List<String>  features  = new ArrayList<String>();

  // ... getters/setters
        
  public void addFeature(String feature) { getFeatures().add(feature); }
}

Another class:

@GET
@Path("/item/{id}")
@Produces({"application/xml", "application/json"})
public Item getItem(@PathParam("id") String id) {
  Item item     = new Item();
  item.setId(id);
  item.setTitle("abc");
  item.setDescription("def");
  item.addFeature("123");
  item.addFeature("456");
  return item;
}

When I send a request to ".../item/1", I get back:

<Item>
 <description>def</description>
 <features>123</features>
 <features>456</features>
 <id>1</id>
 <title>abc</title>
</Item>

I'd really prefer to get:

<Item>
 <description>def</description>
 <features>
  <feature>123</feature>
  <feature>456</feature>
 </features>
 <id>1</id>
 <title>abc</title>
</Item>

I've played around with several of the "@Xml" annotations on the
"features" field, but they just give me exceptions.  For instance, I
just tried a simple case of adding '@XMLElement("feature")' just before
that field, and it gave me this exception:

WARNING: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 1
counts of IllegalAnnotationExceptions
Class has two properties of the same name "features"
        this problem is related to the following location:
                at public java.util.List
com.att.ecom.catalog.Item.getFeatures()
                at com.att.ecom.catalog.Item
        this problem is related to the following location:
                at private java.util.List
com.att.ecom.catalog.Item.features
                at com.att.ecom.catalog.Item