DAO service layer in jpaRepository - spring

Question

I've been reading Spring Boot tutorials, most of the MVC patterns are implemented based on
1) Dao interface
2) Dao Interface Implementation
3) Service interface for persistence
4) Service implementation
I think this is the good practice and I was working it. Now I try to use JpaRepository which helps to implement easily and efficiently. The configuration of my project is
Configuration class
#Configuration
#PropertySource(value = { "classpath:application.properties" })
#EnableJpaRepositories(value={"com.dept.dao"})
public class ApplicationContextConfig {
#Autowired
private Environment environment;
#Bean(name = "dataSource")
public DataSource getDataSource() {
//DataSource connections
}
private Properties getHibernateProperties() {
//Hibernate properties
}
#Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(getDataSource());
sessionFactory.setPackagesToScan(new String[] { "com.dept.model" });
sessionFactory.setHibernateProperties(getHibernateProperties());
return sessionFactory;
}
#Autowired
#Bean(name = "transactionManager")
public HibernateTransactionManager getTransactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager transactionManager = new HibernateTransactionManager(sessionFactory);
return transactionManager;
}
#Primary
#Bean(name="entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws ClassNotFoundException {
final LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(getDataSource());
// mention packae scan your classes annotated as #Entity
entityManagerFactoryBean.setPackagesToScan(new String[] { "com.dept.model" });
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setShowSql(true);
entityManagerFactoryBean.setJpaVendorAdapter(vendorAdapter);
entityManagerFactoryBean.setJpaProperties(getHibernateProperties());
entityManagerFactoryBean.afterPropertiesSet();
entityManagerFactoryBean.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver());
return entityManagerFactoryBean;
}
#Primary
#Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager() {
final JpaTransactionManager transactionManager = new JpaTransactionManager();
try {
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
transactionManager.setDataSource(getDataSource());
transactionManager.setJpaDialect(new HibernateJpaDialect());
transactionManager.setJpaProperties(getHibernateProperties());
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return transactionManager;
}
#Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
#Bean
public HibernateExceptionTranslator hibernateExceptionTranslator() {
return new HibernateExceptionTranslator();
}
#Bean
public JpaVendorAdapter japAdapter(){
return new HibernateJpaVendorAdapter();
}
}
Example I need to save this object in database. So I implemented methods
Doa interface
public interface DepartmentDao extends JpaRepository<Department, Integer>{
}
I'm stuck how to implement Dao implementation, I used like this
Dao Implementation
#Repository
public class DepartmentDaoImpl implements DepartmentDao {
#Autowired
private SessionFactory sessionFactory;
// All other overridden methods
#Override
public <S extends Department> S save(S entity) {
return (S) sessionFactory.getCurrentSession().save(entity);
}
}
Service interface
public interface DepartmentService {
// Other all necessary methods
public <S extends Department> S save(S entity);
}
Service Implementation
#Service
public class DepartmentServiceImpl implements DepartmentService{
#Autowired
DepartmentDao departmentDao;
#Override
#Transactional
public <S extends Department> S save(S entity) {
return departmentDao.save(entity);
}
}
Controller class
#RequestMapping(value = "/save", method = RequestMethod.POST)
public ModelAndView saveDepartment(#Valid #ModelAttribute("departmentForm") Department department) {
departmentService.save(department); //departmen already autowired
return new ModelAndView("redirect:/department/list");
}
I tried to save this object in database, but no transaction happened. There were no errors also. Since I'm new to Spring Boot, I confused myself how to use jparepository. I developed this by using online reference and spent more time.