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Non uniform output when serializing lists in com.thoughtworks.xstream Jettison JSON convertor
@Test
public void test() throws JsonParseException {

    List<String> list1 = new ArrayList<String>();
    list1.add("1");

    List<String> list2 = new ArrayList<String>();
    list2.add("1");
    list2.add("2");

    XStream xstream = new XStream(new JettisonMappedXmlDriver());
    xstream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);

    String list1String = xstream.toXML(l1);
    String list2String = xstream.toXML(l2);

}

list1 = {"list":[{"string":**1**}]},
list2 = {"list":[{"string":**[1,2]**}]}.

list1 = {"list":[{"string":**[1]**}]},
list2 = {"list":[{"string":**[1,2]**}]}