XStream xs = xmlConfig.getConfiguredXStream(new XStream(new DomDriver()));
WMSLayer newLayer = null;
if (formatExtension.equalsIgnoreCase("xml")) {
newLayer = (WMSLayer) xs.fromXML(is);
} else if (formatExtension.equalsIgnoreCase("json")) {
HierarchicalStreamDriver driver = new JettisonMappedXmlDriver();
HierarchicalStreamReader hsr = driver.createReader(is);
// See http://jira.codehaus.org/browse/JETTISON-48
StringWriter writer = new StringWriter();