Tag tag = userTag.getTag();
fillId(userDao, user);
fillId(tagDao, tag);
UserTag obj = getUserTag(tagDao, user, tag);
if (obj == null) {
throw new NoSuchUserTagException("no such userTag: user="
+ user.getUsername() + ",tag=" + tag.getLabel());
}
userTag.setId(obj.getId());
}
}