StringBuilder builder = new StringBuilder();
for (Iterator<PasswordUser> it = users.values().iterator();
it.hasNext(); ) {
PasswordUser user = it.next();
builder.append(user.getPrincipal().getName());
String []roles = user.getRoles();
if (roles != null && roles.length > 0) {
builder.append(": ");
for (int i = 0; i < roles.length; i++) {
builder.append(roles[i]);