[英]Hibernate 4 : org.hibernate.HibernateException: No Session found for current thread
[英]Problems in Spring + Hibernate application: org.hibernate.HibernateException: No Session found for current thread
我正在研究如何將Spring Framework與Hibernate集成以創建我的DAO對象
我在從CRUD操作集執行讀取操作時遇到一些問題。
我有這個實現我的DAO對象的類:
package org.andrea.myexample.HibernateOnSpring.dao;
import org.andrea.myexample.HibernateOnSpring.entity.Person;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.transaction.annotation.Transactional;
public class PersonDAOImpl implements PersonDAO{
private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
// Metodo che inserisce un nuovo record nella tabella person
@Transactional(readOnly=false)
public void addPerson(Person p) {
Session session = sessionFactory.openSession();
session.save(p);
session.close();
}
/* Metodo che recupera un record, rappresentante uno studente, avente uno
* specifico id dalla tabella.
*
* @param L'id dello studente
* @see org.andrea.myexample.myJdbcSpringExample.StudentDAO#getStudent(java.lang.Integer)
*/
public Person getById(int id){
Session session = sessionFactory.openSession();
return (Person) sessionFactory.getCurrentSession().get(Person.class, id);
}
}
我有以下用於廣告測試類的主要類:
package org.andrea.myexample.HibernateOnSpring;
import org.andrea.myexample.HibernateOnSpring.dao.PersonDAO;
import org.andrea.myexample.HibernateOnSpring.dao.PersonDAOImpl;
import org.andrea.myexample.HibernateOnSpring.entity.Person;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
public static void main( String[] args ){
ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
System.out.println("Contesto recuperato: " + context);
Person persona1 = new Person();
persona1.setFirstname("Pippo");
persona1.setLastname("Blabla");
//persona1.setPid(1);
System.out.println("Creato persona1: " + persona1);
PersonDAO dao = (PersonDAO) context.getBean("personDAOImpl");
System.out.println("Creato dao object: " + dao);
dao.addPerson(persona1);
System.out.println("persona1 salvata nel database");
Person personaEstratta = dao.getById(persona1.getPid());
System.out.println("Persona con id: " + personaEstratta.getPid() + " estratta dal DB");
System.out.println("Dati persona estratta:");
System.out.println("Nome: " + personaEstratta.getFirstname());
System.out.println("Cognome: " + personaEstratta.getLastname());
}
}
這個測試類首先在我的數據庫表中插入一條新記錄,好吧......這個工作得很好(新行正確地插入到表中)
嘗試提取具有特定ID的行。 這里我遇到了一些問題,因為在嘗試獲取對象時會拋出以下異常:
Contesto recuperato: org.springframework.context.support.ClassPathXmlApplicationContext@11ba3c1f: startup date [Sat Feb 23 19:07:42 CET 2013]; root of context hierarchy
Creato persona1: org.andrea.myexample.HibernateOnSpring.entity.Person@777dcf23
Creato dao object: org.andrea.myexample.HibernateOnSpring.dao.PersonDAOImpl@3f12ccc4
persona1 salvata nel database
**
Exception in thread "main" org.hibernate.HibernateException: No Session found for current thread
at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:97)
at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:978)
at org.andrea.myexample.HibernateOnSpring.dao.PersonDAOImpl.getById(PersonDAOImpl.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)
at sun.proxy.$Proxy11.getById(Unknown Source)
at org.andrea.myexample.HibernateOnSpring.App.main(App.java:33)**
問題是什么? 讓對象正確的是我的策略嗎?
TNX
安德里亞
你的問題在這里:
public Person getById(int id){
Session session = sessionFactory.openSession();
return (Person) sessionFactory.getCurrentSession().get(Person.class, id);
}
方法getCurrentSession()
返回綁定到當前上下文的會話。 您無法在設置中使用此方法,您需要在addPerson
方法中使用openSession()
。 所以你需要這樣做:
public Person getById(int id){
Session session = sessionFactory.openSession();
try {
return (Person) session.get(Person.class, id);
} finally {
session.close();
}
}
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