How do I rename XStream list elements?

I have a model that looks like:

@XStreamAlias("article")
class Article {
  List<String> tags;
  List<String> categories;
}

XStream serializes to XML that looks like:

<article>
  <tags>
    <string>foo</string>
  </tags>
  <categories>
    <string>bar</string>
  </categories>
</article>

My question is how can I make it so that <string>foo</string> becomes <tag>foo<tag> and <string>bar</string> becomes <category>bar</category>? I'm unable to change the structure of my model since I am using the Morphia ODM to create the Article instances (article开发者_StackOverflow社区 must contain List<String>).

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This post may be of use to you.

Nutshell version:

ClassAliasingMapper mapper = new ClassAliasingMapper(stream.getMapper());
mapper.addClassAlias("tag", String.class);
mapper.addClassAlias("category", String.class);
stream.registerLocalConverter(Article.class, "tags", new CollectionConverter(mapper));
stream.registerLocalConverter(Article.class, "categories", new CollectionConverter(mapper));

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In XStream version 1.4.5 you need to define different mapper objects for different class alias. The solution will be as following:

    ClassAliasingMapper mapper = new ClassAliasingMapper(xstream.getMapper());  

    //tag
    mapper.addClassAlias("tag", String.class);
    xstream.registerLocalConverter(
        Article.class,
        "tags",
        new CollectionConverter(mapper)
    );


    mapper = new ClassAliasingMapper(xstream.getMapper()); 
          // this is required otherwise it will override the previos mapper
    mapper.addClassAlias("category", String.class);
    xstream.registerLocalConverter(
        Article.class,
        "categories",
        new CollectionConverter(mapper)
    );

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Out of my mind:

@XStreamImplicit(itemFieldName="tag")
private List<String> categoryList;

Does it work?