XStream二重下線問題の処理について

public class XStreamFactory {
    public static XStream getXStream() {
        final NameCoder nameCoder = new NoNameCoder();
        XStream xStream = new XStream(new XppDomDriver(nameCoder) {
            @Override
            public HierarchicalStreamWriter createWriter(Writer out) {
		// xml 
		//return new PrettyPrintWriter(out, nameCoder) {
		// xml ， 
                return new CompactWriter(out, nameCoder) {
                    boolean cdata = false;

                    @Override
                    public void startNode(String name, Class clazz) {
                        super.startNode(name, clazz);
                        //  CDATA 
                        cdata = "String".equals(clazz.getSimpleName());
                    }

                    @Override
                    protected void writeText(QuickWriter writer, String text) {
                        if (cdata) {
                            writer.write("<![CDATA[");
                            writer.write(text);
                            writer.write("]]>");
                        } else {
                            writer.write(text);
                        }
                    }
                };
            }
        });
        return xStream;
    }
}

XStream xStream = XStreamFactory.getStream();

// xml to java object
xStream.ignoreUnknownElements();
xStream.alias("xml", Class< java object>);
xStream.fromXML("<xml><tag>aaa</tag></xml>");

// java object to xml
xStream.toXML(java object);