Java Hibernate DAO工厂无法实例化DAO

我有一个JSF2.0/Servlet3.0 Web应用程序，它使用hibernate和GlassFish3上的连接池数据源。 我尝试使用本教程中描述的DAO模式：
我还在使用HibernateSessionRequestFilter使用OpenSessionView模式，如下所述： 我的hibernate配置的相关部分：

jta
org.hibernate.transaction.JTATransactionFactory
org.hibernate.transaction.SunONETransactionManagerLookup

DAO接口和实现似乎工作正常，但工厂无法实例化DAO。如果我在ManagedBean中手动实例化它们：

profileDao = new ProfileDAOHibernate();
profileDao.setSession(HibernateUtil.getSessionFactory().getCurrentSession());

但使用工厂：

factory = DAOFactory.instance(DAOFactory.HIBERNATE);
profileDao = factory.getProfileDAO();

失败，运行时异常：

SCHWERWIEGEND: java.lang.InstantiationException: model.dao.interfaces.ProfileDAO
at java.lang.Class.newInstance0(Class.java:340)
at java.lang.Class.newInstance(Class.java:308)
at model.dao.factory.hibernate.HibernateDAOFactory.instantiateDAO(HibernateDAOFactory.java:87)
at model.dao.factory.hibernate.HibernateDAOFactory.getProfileDAO(HibernateDAOFactory.java:62)
at controller.admin.ProfileController.<init>(ProfileController.java:73)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188)

冬眠办公室：

// getters for the DAO
@Override
public ProfileDAO getProfileDAO() {
    return (ProfileDAO)instantiateDAO(ProfileDAO.class);
}
//...
private GenericHibernateDAO instantiateDAO(Class daoClass) {
    try {
        GenericHibernateDAO dao = (GenericHibernateDAO)daoClass.newInstance();
        dao.setSession(getCurrentSession());

        return dao;
    } catch (Exception ex) {
        ex.printStackTrace();
        throw new RuntimeException("Can not instantiate DAO: " + daoClass, ex);
    }
}

// You could override this if you don't want HibernateUtil for lookup
protected Session getCurrentSession() {
    return HibernateUtil.getSessionFactory().getCurrentSession();
}

public static final Class HIBERNATE = model.dao.factory.hibernate.HibernateDAOFactory.class;

/**
 * Factory method for instantiation of concrete factories.
 */
public static DAOFactory instance(Class factory) {
    try {
        return (DAOFactory)factory.newInstance();
    } catch (Exception ex) {
        throw new RuntimeException("Couldn't create DAOFactory: " + factory);
    }
}

// DAO Interfaces
public abstract ProfileDAO getProfileDAO();

道场：

// getters for the DAO
@Override
public ProfileDAO getProfileDAO() {
    return (ProfileDAO)instantiateDAO(ProfileDAO.class);
}
//...
private GenericHibernateDAO instantiateDAO(Class daoClass) {
    try {
        GenericHibernateDAO dao = (GenericHibernateDAO)daoClass.newInstance();
        dao.setSession(getCurrentSession());

        return dao;
    } catch (Exception ex) {
        ex.printStackTrace();
        throw new RuntimeException("Can not instantiate DAO: " + daoClass, ex);
    }
}

// You could override this if you don't want HibernateUtil for lookup
protected Session getCurrentSession() {
    return HibernateUtil.getSessionFactory().getCurrentSession();
}

public static final Class HIBERNATE = model.dao.factory.hibernate.HibernateDAOFactory.class;

/**
 * Factory method for instantiation of concrete factories.
 */
public static DAOFactory instance(Class factory) {
    try {
        return (DAOFactory)factory.newInstance();
    } catch (Exception ex) {
        throw new RuntimeException("Couldn't create DAOFactory: " + factory);
    }
}

// DAO Interfaces
public abstract ProfileDAO getProfileDAO();

非常感谢您的帮助。

这里

return (ProfileDAO)instantiateDAO(ProfileDAO.class);

您正在尝试实例化一个抽象类。这和你要做的一样

profileDao = new ProfileDAO();

这是不可能的。您需要实例化一个具体的类

return (ProfileDAO)instantiateDAO(ProfileDAOHibernate.class);