I am developing simple Hibernate project with Spring IoC and faced stupid NPE during injection. Both xml and Java style Spring configurations turned out to be inefficient and I stuck. Any help will be appreciated.
Exception I meet:
Exception in thread "main" java.lang.NullPointerException
at com.phoneBook.DAO.ContactDAOImpl.getSession(ContactDAOImpl.java:22)
at com.phoneBook.DAO.ContactDAOImpl.save(ContactDAOImpl.java:28)
at com.phoneBook.DAO.ContactDAOImpl.main(ContactDAOImpl.java:61)
My application-config.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" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
<context:component-scan base-package="com.phoneBook" />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:properties/database.properties" />
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.phoneBook.entities" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.flushMode">${hibernate.flushMode}</prop>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="persistenceExceptionTranslationPostProcessor"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
</beans>
application-context.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.phoneBook" />
</beans>
Contact.class
package com.phoneBook.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="contacts")
public class Contact {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="contact_id")
private int id;
@Column(name="contact_surname", nullable = false, length = 20)
private String surname;
@Column(name="contact_name", nullable = false, length = 20)
private String name;
@Column(name="contact_patname", nullable = false, length = 20)
private String patName;
@Column(name="contact_mobtel", unique = true, nullable = false, length = 12)
private String telNumberMob;
@Column(name="contact_hometel", length = 12)
private String telNumberHome;
@Column(name="contact_address", length = 30)
private String address;
@Column(name="contact_email", length = 20)
private String email;
public Contact(){}
public Contact(String surname, String name, String patName, String mobTel, String homeTel, String address, String email){
this.surname = surname;
this.name = name;
this.patName = patName;
this.telNumberMob = mobTel;
this.telNumberHome = homeTel;
this.address = address;
this.email = email;
}
//getters and setters
}
and ContactDAOimpl.java
package com.phoneBook.DAO;
import java.util.List;
import javax.transaction.Transactional;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.phoneBook.entities.Contact;
@Repository
@Transactional
public class ContactDAOImpl implements ContactDAO {
@Autowired
private SessionFactory sessionFactory;
protected Session getSession(){
return sessionFactory.getCurrentSession();
}
@Override
public void save(Contact cont) {
if(cont.getId()==0)
getSession().persist(cont);
else
getSession().update(cont);
}
@Override
public Contact getById(int id) {
Contact contact = (Contact)getSession().createCriteria(Contact.class).add(Restrictions.eq("id",id)).uniqueResult();
return contact;
}
@Override
public List<Contact> getAll() {
@SuppressWarnings("unchecked")
List<Contact> allContacts = sessionFactory.getCurrentSession().createCriteria(Contact.class).list();
return allContacts;
}
@Override
public int remove(Contact cont) {
getSession().delete(cont);
return cont.getId();
}
public static void main(String args[]){
ContactDAOImpl dao = new ContactDAOImpl();
Contact testContact = new Contact("name", "surname", "patname", "380442322233", "380442322233",
"address", "name@gmail.com");
dao.save(testContact);
}
}
My dependencies:
