final Properties groupProperties = new Properties();
groupProperties.load(fis, new AsyncCallback<Boolean>()
{
public void onSuccess(Boolean b)
{
for(Object o : groupProperties.keySet())
{
Group g = new Group((String) o);
String groupRecord = (String) groupProperties.get(o);
// Display Name : memeber1,memeber2,...
String[] fields = groupRecord.split(":",2);