NullPointException with Hibernate 4 and Spring 3.0.5 Intergration

Question

I tried to create a Java program using Hibernate 4.1.6 and Spring 3.0.5. When i ran my app throwing NULLPOINT EXCEPTION. Anyone help me, please,

1. SpringBeans.xml:

   http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

   <!-- Database Configuration -->
   <import resource="config/spring/DataSource.xml"/>
   <import resource="config/spring/HibernateSessionFactory.xml"/>
   
   <!-- Beans Declaration -->
   <import resource="config/spring/UserBeans.xml"/>
   

   2. HibernateSessionFactory.xml
   

   <property name="dataSource">
     <ref bean="dataSource"/>
   </property>
   
   <property name="hibernateProperties">
      <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
        <prop key="hibernate.show_sql">true</prop>
      </props>
   </property>
   
   <property name="mappingResources">
       <list>
         <value>com/model/TblUser.hbm.xml</value>
       </list>
   </property> 
   

2. DataSource.xml

   WEB-INF/classes/config/database/properties/database.properties

3. database.properties

   jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql:localhost:3306/auction_nms jdbc.username=root jdbc.password=root

4. UserBeans.xml

   <!-- User business object -->
   

5. UserDaoImpl .java

   public class UserDaoImpl implements UserDao { @Autowired SessionFactory sessionFactory;

   /*
    * @see com.dao.UserDao#save(com.model.TblUser)
    */
   @Override
   public void save(TblUser user) {
       sessionFactory.getCurrentSession().save(user);
   }
   

7.App.java

public class App {

    // get log4j handler
    private static final Logger logger = Logger.getLogger(App.class);

    static TblUser              user   = new TblUser(2, "2", "2");

    public static void main(String[] args) {
        try {
            UserDao userDao = new UserDaoImpl();
            userDao.save(user);
        } catch (Exception e) {
            System.err.`enter code here`println(e);
        } finally {
            if (logger.isDebugEnabled()) {
                logger.debug(user);
            }
        }
    }
}

Thank you very much!!!

Answer 1

You are creating the UserDAO object by using the new keyword. You should start the spring container by loading the appContext, in your case SpringBeans.xml. If you use the new keyword Spring doesnt manage your dependencies, hence, your sessionFactory is never injected into the DAO instance.

This should be the contents of you main() instead of the current ones.

ApplicationContext appContext = new ClassPathXmlApplicationContext(new String[] {
        "classpath*:/META-INF/SpringBeans.xml"
        });
appContext.getBean("userDao");

.. call your save on it.