Caused by: java.lang.NullPointerException at org.o7planning.impl.EmployeDAOImpl.(EmployeDAOImpl.java:34)

Question

this is my file.XML where I try to instantiate my beans: applicationDaoContext.XML

`
 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">

 <bean id="EmployeDAO" class="org.o7planning.impl.EmployeDAOImpl">
     <property name="sessionFactory" ref="SessionFactory" />
 </bean>
</beans>  `

this is my Class EmployeDaooImpl that failed to be instantiated: ( hibernate spring maven tomcat server ) with eclipse

package org.o7planning.impl;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.o7planning.dao.EmployeDao;
import org.o7planning.Entity.Employe;
import org.hibernate.Query;

import org.hibernate.cfg.Configuration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;

@Transactional
public class EmployeDAOImpl implements EmployeDao {

    public EmployeDAOImpl() {
        super();


    }

        public void init(){
            new EmployeDAOImpl();
            System.out.println(" mossab method initi de la classe employimpldao");
        }
    private SessionFactory sessionFactory;

    Session session = sessionFactory.getCurrentSession();

            // methode implementer par l'interface
            @SuppressWarnings("unchecked")
            public List<Employe> getAllEmploye() {

                Session session = this.sessionFactory.getCurrentSession();

                List<Employe> list = session.createQuery("from EMPLOYEES").getResultList()  ;
                session.close();
                return list;
}
                // method implementer par l'interface   
            public Integer getMaxEmployeByID() {
                Session session = this.sessionFactory.getCurrentSession();
                String sql = "Select max(E.EMPLOYEE_ID) from EMPLOYEES E ";
                Query query = session.createQuery(sql);
                Integer maxEmployId = (Integer) query.uniqueResult();
                  if (maxEmployId == null) {
                      return 0;
                  }

                  return maxEmployId;
            }

                // methode implementer par l'interface
            public void createEmploy(String nom, String prenom) {

          Integer employId = getMaxEmployeByID() + 1;
          Employe employ = new Employe();
          employ.setId_Employe(employId);
          employ.setNom(nom);
          employ.setPrenom(prenom);
          Session session = this.sessionFactory.getCurrentSession();
          session.persist(employ);

    }

            public SessionFactory getSessionFactory() {
                return sessionFactory;
            }

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

}

Possible duplicate of [What is a NullPointerException, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Paul Abbott, Feb 10 '17 at 19:20
But I use an init-method in my Beans. And I create this method in my java class but the same exception still persists — Mossab Rahhmouni, Feb 10 '17 at 19:46
Your `#init()` method is not clear what you're trying to accomplish. Please reformat the code so we can help. Additionally, why are you creating a new instance of the class inside `#init()` to start with? — Naros, Feb 10 '17 at 21:00
/ @Bean(initMethod="init") public EmployeDAOImpl creerInstance(){ return new EmployeDAOImpl(); } — Mossab Rahhmouni, Feb 12 '17 at 18:52

score 0 · Answer 1 · answered May 05 '17 at 16:55

You need to change code like:

private SessionFactory sessionFactory;
// Remove this line:
// Session session = sessionFactory.getCurrentSession();

At this time, the sessionFactory is not assigned a value, so it's null. Its value is not null when Spring injected value to it. Spring will call setSessionFactory method to inject value to sessionFactory field.

You can write more code in setSessionFactory method.

Caused by: java.lang.NullPointerException at org.o7planning.impl.EmployeDAOImpl.(EmployeDAOImpl.java:34)

1 Answers1