SQL语言的布局和IllegalArgumentException

和java.lang.IllegalArgumentException: org.hibernate.QueryException: JPA-style positional param was not an integral ordinal战斗了半天，汗啊！

使用jpa + strut+ hibernate 就报org.hibernate.QueryException: JPA-style positional param was not an integral ordinal

一般把hql语句写在一行，会很长，在ide中需要拖动滚动条才能查看。为了方便阅读，故改成几行：
public List<Resource> getResourceByTag(Tag tag,int start) {
        Query query = entityManager.createQuery(
                "SELECT r FROM Resource r WHERE ?1" +
                "IN (SELECT t FROM r.res_tags t)" +
                "ORDER BY r.res_update_date DESC");
        query.setParameter(1, tag);
        query.setFirstResult(start);
        query.setMaxResults(Constants.ITEMS_PER_PAGE);
        return query.getResultList();
    }

然后就报错ava.lang.IllegalArgumentException: org.hibernate.QueryException: JPA-style positional param was not an integral ordinal。
啊啊啊啊啊啊，sql中少了好几个空格，就在换行的地方

正确：
"FROM Resource r WHERE ?1 " +
                "IN (FROM r.res_tags) " +
                "ORDER BY r.res_update_date DESC");
无奈的教训！