连接池配少了吧

解决了,将代码改成如下即可

public UserEntity queryByMainKey(long phone) {
        int retry = 0;
        entity = new UserEntity();
        Session session = factory.getCurrentSession();
        Transaction transaction = session.beginTransaction();
        while (retry++ < 3) {
            try {
                //if(!session.isOpen()) session.beginTransaction();
                Query q = session.createQuery("from UserEntity where phone=?");
                q.setLong(0, phone);

                if (q.list() == null || q.list().size() == 0) {
                    return null;
                }
                entity.Clone((UserEntity) q.list().get(0));

                return entity;
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }
        }
        return null;
    }