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Java XStream with HashMap
Map<String, String> map = new HashMap<String, String>();
map.put("first", "value1");
map.put("second", "value2");

{'first' : 'value1', 'second' : 'value2' }

XStream xstream = new XStream(new JettisonMappedXmlDriver() {
    public HierarchicalStreamWriter createWriter(Writer writer) {
        return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
    }
});

xstream.toXML(map);

[["first", "value1"], ["second", "value2"]]