The object doesn't get persisted in Hibernate 4 - spring

Question

I configured Hibernate and Spring.
The config and Java class:
package com.dao.impl;
import com.dao.IPersonRepository;
import com.dao.impl.generic.GenericRepository;
import com.model.Person;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
/**
* Created by ramezanimatin on 8/18/2015.
*/
#Repository
public class PersonRepository extends GenericRepository<Person, Long> implements IPersonRepository {
}
package com.dao;
import com.dao.iGeneric.IGenericRepository;
import com.model.Person;
/**
* Created by ramezanimatin on 8/18/2015.
*/
public interface IPersonRepository extends IGenericRepository<Person, Long> {
}
package com.dao.iGeneric;
import java.io.Serializable;
/**
* Created by ramezanimatin on 8/23/2015.
*/
public abstract interface IGenericRepository<T, pk extends Serializable> {
public void save(T t);
public T loadByEntityId(pk id);
}
package com.dao.impl.generic;
import com.dao.iGeneric.IGenericRepository;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import java.io.Serializable;
/**
* Created by ramezanimatin on 8/23/2015.
*/
#Repository
public class GenericRepository<T, pk extends Serializable> implements IGenericRepository<T, pk> {
#Autowired(required = true)
private SessionFactory sessionFactory;
private Session getSession() {
try {
return sessionFactory.getCurrentSession();
} catch (Exception e) {
return sessionFactory.openSession();
}
}
#Override
public void save(Object o) {
getSession().save(o);
}
#Override
public T loadByEntityId(pk id) {
Session session = getSession();
Query query = session.createQuery("from Person e where e.id=:id");
query.setParameter("id", id);
return ((T) query.uniqueResult());
}
}
xml config:
<?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:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd">
<context:property-placeholder location="classpath:oracle-hibernate.properties"/>
<context:component-scan base-package="com"/>
<!-- <jee:jndi-lookup id="dataSource" jndi-name="test" />-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="com.model"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">create</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql"> ${hibernate.show_sql}</prop>
<prop key="hibernate.default_schema"> ${hibernate.default_schema}</prop>
<prop key="hibernate.connection.defaultNChar">true</prop> <!--Oracle need -->
<prop key="hibernate.connection.characterEncoding">UTF8</prop> <!--Oracle need -->
<prop key="hibernate.connection.charSet">UTF8</prop> <!--Oracle need -->
<prop key="hibernate.connection.useEncoding">true</prop> <!--Oracle need -->
<prop key="hibernate.transaction.factory_class" >${hibernate.transaction.factory_class}</prop>
<!-- <prop key="hibernate.transaction.manager_lookup_class" >${hibernate.transaction.manager_lookup_class}</prop>
<prop key="hibernate.current_session_context_class" >${hibernate.current_session_context_class}</prop>-->
</props>
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"
proxy-target-class="true"/>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</beans>
personService:
package com.service.impl;
import com.dao.IPersonRepository;
import com.model.Person;
import com.service.IPersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
/**
* Created by ramezanimatin on 8/15/2015.
*/
#Service
public class PersonService implements IPersonService {
#Autowired(required = true)
private IPersonRepository iPersonRepository;
#Override
#Transactional
public void insertPerson(Person person) {
iPersonRepository.save(person);
}
#Override
#Transactional
public void loadByEntityId(Long id) {
Person person = iPersonRepository.loadByEntityId(id);
System.out.println(person.getName());
person.setName("matin");
}
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.test</groupId>
<artifactId>test</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>3.2.0.Final</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.1.2.Final</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.0.GA</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<!-- jpa lib-->
</dependencies>
<build>
<finalName>test</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
My problem:
In Hibernate the Object Model has 3 states:
1- Transient
2- Persistent
3- Detached
I want to clarify the following situation:
When Object Model is fetched from the DataBase, it is Persistent. In loadByEntityId of PersonService when the Person Entity is loaded, It isn't persistent. Why?
I changed name to 'Matin' but didn't commited to DataBase.

Answer 1

Updated:
Thanks to M. Deinum for explain subtle differences.
Please remove this method:
private Session getSession() {
try {
return sessionFactory.getCurrentSession();
} catch (Exception e) {
return sessionFactory.openSession();
}
}
and just invoke getCurrentSession() for example:
Session session = sessionFactory.getCurrentSession();
In this method:
#Override
#Transactional
public void loadByEntityId(Long id) {
Person person = iPersonRepository.loadByEntityId(id);
System.out.println(person.getName());
person.setName("matin");
}
you have found Person entity and it's pretty much done. Under the hood you are using session in Hibernate so this particular code:
Session session = sessionFactory.getCurrentSession();
Query query = session.createQuery("from Person e where e.id=:id");
query.setParameter("id", id);
return ((T) query.uniqueResult());
only retrieve data.
What you need to do is define update method in your repository IGenericRepository interface:
public abstract interface IGenericRepository<T, pk extends Serializable> {
public void save(T t);
public T loadByEntityId(pk id);
public void updateEntity(T t);
}
implement it in GenericRepository:
#Override
public void updateEntity(T entity) {
getSession().update(entity);
}
define in IPersonService method updatePerson and implement it in PersonService and use updateEntity from Repostitory:
#Override
#Transactional
public void updatePerson(Person person) {
iPersonRepository.updateEntity(person);
}
And now when you use loadByEntityId after you have updated Person with updatePerson you should retrieve updated entity from db.