java.lang.Integer cannot be cast to

Question

public List<Materials> findAllMaterialsByAppid(Integer appid) {
    String hql1 = "select medid from Materials where appid = ? and pid = 0";
    List<Materials> list = this.hibernateTemplate.find(hql1, appid);
    if (list != null && list.size() > 0) {
        if(list.get(0).getMedid() != null){
            Integer medid = (Integer)list.get(0).getMedid();
            String hql2 = "from Materials where appid = ? and pid = ?";
            return this.hibernateTemplate.find(hql2, appid, medid);
        }

请教一下大家

Answer 1

String hql1 = "from Materials where appid = ? and pid = 0";