[英]DAO class cannot be cast
我有CourseDetailsDAO和BeanDAO。 我越来越
university.BeanDAO cannot be cast to university.CourseDetailsDAO
at CourseDetailsBean.performLookup(CourseDetailsBean.java:49)
at CourseDetailsBean.CoursedetailsAction(CourseDetailsBean.java:38)
这些行是:
CourseDetailsBean.java:49
CourseDetailsDAO helper = (CourseDetailsDAO) apc.getBean("courseDetailsDao");
和
CourseDetailsBean.java:38
performLookup(cID, cName, cDuration, cEligibility, cFee);
豆豆
public List getStudent() {
List<Student> students = null;
try
{
Session session = sessionFactory.openSession();
org.hibernate.Transaction tx = session.beginTransaction();
Query q = session.createQuery("from university.Student");
students = (List<Student>)q.list();
课程详情
public List getcourseByName(String courseName) {
List<Coursedetails> courselist = null;
try
{
Session session = sessionFactory.openSession();
org.hibernate.Transaction tx = session.beginTransaction();
Criteria criteria = session.createCriteria(Coursedetails.class)
.add(Restrictions.eq("coursename", courseName));
courselist = (List<Coursedetails>) criteria.list();
tx.commit();
但我注意到服务器几乎没有警告,可能是对失败的预测。
Warning: Could not register destruction callback [org.springframework.beans.factory.support.DisposableBeanAdapter@140f0e8] for attribute 'bean' because FacesRequestAttributes does not support such callbacks`
Warning: Could not register destruction callback [org.springframework.beans.factory.support.DisposableBeanAdapter@13f8471] for attribute 'courseDetailsBean' because FacesRequestAttributes does not support such callbacks
Warning: Could not register destruction callback [org.springframework.beans.factory.support.DisposableBeanAdapter@ce983a] for attribute 'bean' because FacesRequestAttributes does not support such callbacks
Warning: Could not register destruction callback [org.springframework.beans.factory.support.DisposableBeanAdapter@16bafa6] for attribute 'courseDetailsBean' because FacesRequestAttributes does not support such callbacks
检查您的spring bean配置文件,是否通过评估id是否正确将BeanDao和CourseDetailsDao声明为bean。 您已用于获取对象引用。
CourseDetailsDAO helper = (CourseDetailsDAO) apc.getBean("courseDetailsDao");
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