public static final String DEF_USERS_BY_USERNAME_QUERY =
            "SELECT username,password,enabled " +
            "FROM users " +
            "WHERE username = ?";
    public static final String DEF_AUTHORITIES_BY_USERNAME_QUERY =
            "SELECT username,authority " +
            "FROM authorities " +
            "WHERE username = ?";
    public static final String DEF_GROUP_AUTHORITIES_BY_USERNAME_QUERY =
            "SELECT g.id, g.group_name, ga.authority " +
            "FROM groups g, group_members gm, group_authorities ga " +
            "WHERE gm.username = ? " +
            "AND g.id = ga.group_id " +
            "AND g.id = gm.group_id";