try {
Preferences pref = pref_root.node(getPrefNode());
for (String u : pref.childrenNames()) {
Preferences pref_u = pref.node(u);
if (pref_u.get("ConnectRole", "").compareTo("") != 0) {
OUser os = new OUser(this, pref_u.get("UserName", ""), pref_u.get("Password", ""),
pref_u.getBoolean("SavePassword", false),
RoleTypes.valueOf(pref_u.get("ConnectRole", "")),
ObjectAccessed.valueOf(pref_u.get("Access", "User")));
Users.add(os);
}