Spring 3, Hibernate 4 AutoWired sessionFactory avec DAO générique

Question

utilisant Spring MVC 3 & Hibernate 4 Je reçois:

java.lang.NullPointerException 

com.daniel.rr.dao.common.DAOImpl.getSession(DAOImpl.java:22) 
com.daniel.rr.dao.common.DAOImpl.save(DAOImpl.java:27) 
com.daniel.rr.controller.HelloController.printWelcome(HelloController.java:30) 

Ceci est la configuration du ressort concerné:

<context:annotation-config /> 
<tx:annotation-driven transaction-manager="transactionManager" /> 


<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
    <property name="packagesToScan"> 
     <list> 
      <value>com.daniel.rr.model</value> 
      <value>com.daniel.rr.dao</value> 
      <value>com.daniel.rr.dao.common</value> 
      <value>com.daniel.rr.controller</value> 
     </list> 
    </property> 

    <property name="hibernateProperties"> 
     <props> 
      <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop> 
      <prop key="hibernate.show_sql">true</prop> 
      <prop key="hibernate.hbm2ddl.auto">update</prop> 
     </props> 
    </property> 

    <property name="dataSource" ref="dataSource" /> 
</bean> 


<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 

    <property name="url" value="jdbc:mysql://localhost:3306/rr" /> 
    <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
    <property name="username" value="root" /> 
    <property name="password" value="" /> 

</bean> 



<bean name="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
    <property name="sessionFactory" ref="sessionFactory" /> 
</bean> 

DAO générique:

public interface DAO<T> { 

    T save(T t); 
    void delete(T t); 
} 

@Transactional 
public abstract class DAOImpl<T> implements DAO<T> { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public void setSessionFactory(SessionFactory sessionFactory) { 
     this.sessionFactory = sessionFactory; 
    } 

    public Session getSession() { 
     return sessionFactory.getCurrentSession(); 
    } 

    @Override 
    public T save(T t) { 
     getSession().persist(t); 
     return t; 
    } 

    @Override 
    public void delete(T t) { 
     getSession().delete(t); 
    } 
} 

AccountDAO:

public class AccountDAO extends DAOImpl<Account> implements DAO<Account> { 

} 

MVC Controller:

public class HelloController { 

    @RequestMapping(method = RequestMethod.GET) 
    public String printWelcome(ModelMap model) { 

     //System.out.println("is null? " + sessionFactory); 

     AccountDAO dao = new AccountDAO(); 
     Account account = new Account(); 

     account.setUsername("hello"); 
     account.setPassword("test"); 

     dao.save(account); 

     model.addAttribute("message", "Hello world!"); 
     return "hello"; 
    } 
} 

J'ai recherché à travers StackOverflow et Google, mais je ne peux pas trouver tout ce qui aide. J'ai essayé d'utiliser une transaction sur DAOImpl.save (T t) mais le problème est toujours le même.

public T save(T t) { 
     Transaction tr = getSession().getTransaction(); 
     tr.begin(); 

     getSession().persist(t); 

     tr.commit(); 
     return t; 
    } 

Answer 1

Les annotations ne sont pas héritées. Ajoutez l'annotation transactionnelle au dao concret, et non à la classe abstraite.

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