if (unmarshaller == null) {
unmarshaller = getXmlContext().createUnmarshaller();
unmarshaller.getProperties().put(SDOConstants.SDO_HELPER_CONTEXT, aHelperContext);
unmarshaller.setUnmappedContentHandlerClass(SDOUnmappedContentHandler.class);
unmarshaller.setUnmarshalListener(new SDOUnmarshalListener(aHelperContext));
unmarshaller.setResultAlwaysXMLRoot(true);
xmlUnmarshallerMap.put(Thread.currentThread(), unmarshaller);
}
XMLContext context = getXmlContext();