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我使用下面的架构开发的Hibernate的DAO在Spring应用程序：Spring + Hibernate的不自动打开会话
我有，我宣布，我要的CRUD方法，然后一个的PersonDAO接口I创建一个具体类PersonDAOImpl实现此接口，这一个：
package org.andrea.myexample.HibernateOnSpring.dao;
import org.andrea.myexample.HibernateOnSpring.entity.Person;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
@Repository
@Transactional
public class PersonDAOImpl2 {
// Factory per la creazione delle sessioni di Hibernate:
private static SessionFactory sessionFactory;
// Metodo Setter per l'iniezione della dipendenza della SessionFactory:
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
System.out.println("Ho iniettato la SessionFactory: " + sessionFactory);
}
/** CREATE CRUD Operation:
* Aggiunge un nuovo record rappresentato nella tabella rappresentato
* da un oggetto Person
*/
@Transactional(readOnly = false)
public Integer addPerson(Person p) {
System.out.println("Inside addPerson()");
System.out.println("Connessione aperta: " + sessionFactory.getCurrentSession().isOpen());
System.out.println("E' connesa:" + sessionFactory.getCurrentSession().isConnected());
Integer personID = personID = (Integer) sessionFactory.getCurrentSession().save(p);
return personID;
}
}
然后，我已创建一个MainApp类conteining的main（）方法来测试它是如何工作的。
的问题是，当我执行MainApp当我尝试插入我得到的堆栈跟踪以下错误信息数据库的新纪录：
INFO: Using DataSource [[email protected]] of Hibernate SessionFactory for HibernateTransactionManager
Ho iniettato la SessionFactory: [email protected]
Contesto recuperato: org[email protected]70501e4e: startup date [Sat Mar 09 10:02:37 CET 2013]; root of context hierarchy
Creato persona1: [email protected]
Exception in thread "main" java.lang.ClassCastException: org.andrea.myexample.HibernateOnSpring.dao.PersonDAOImpl2$$EnhancerByCGLIB$$d0c4a932 cannot be cast to org.andrea.myexample.HibernateOnSpring.dao.PersonDAO
at org.andrea.myexample.HibernateOnSpring.MainApp.main(MainApp.java:26)
好像也没有找到会议对象，现在我有一个疑问：我知道Spring为每个@Transactional方法自动打开和关闭会话，但它似乎不工作！
相反，如果我明确地打开一个新的会话时，我调用该方法，它工作得很好......这样：
@Transactional(readOnly = false)
public Integer addPerson(Person p) {
System.out.println("Inside addPerson()");
Session session = sessionFactory.openSession();
Transaction tx = null;
Integer personID = null;
try {
tx = session.beginTransaction();
personID = (Integer) session.save(p);
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
return personID;
}
但我认为，我可以说春天来自动打开会话时在输入方法，并关闭它，当退出
这是我的XML配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/SpringTestDb" />
<property name="username" value="root" />
<property name="password" value="MY_DB_PSWD" />
<property name="initialSize" value="2" />
<property name="maxActive" value="5" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="org.andrea.myexample.HibernateOnSpring.entity" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">false</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="personDAOImpl" class="org.andrea.myexample.HibernateOnSpring.dao.PersonDAOImpl2" >
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<!-- Register @Autowired annotation -->
<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />
</beans>
有人能帮助我吗？
TNX
安德烈
如何使用PersonDAOImpl2 – 2013-03-09 10:40:03