CODEWITHSUNDEEP
javaspringhibernateconfigurationautowired
kasinavijay
kasinavijay

Reputation: 168

How Spring @Autowired binds the SessionFactory object even if there is no SessionFactory instance available

I'm using Hibernate and Spring with Java-based configurations. My config file is this one:

@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory s) {
   HibernateTransactionManager txManager = new HibernateTransactionManager();
   txManager.setSessionFactory(s);
   return txManager;
}

@Bean
public LocalSessionFactoryBean sessionFactory() {
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(dataSource());
    sessionFactory.setPackagesToScan(new String[] { "dto" });
    sessionFactory.setHibernateProperties(hibernateProperties());
    return sessionFactory;
 }

Working fine. No problem with this, but when I manually try to set the sessionfactory parameter for trasactionManager, like this:

@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory s) {
   HibernateTransactionManager txManager = new HibernateTransactionManager();
   txManager.setSessionFactory(sessionFactory());
   return txManager;
}

The IDE is showing:

`The method setSessionFactory(SessionFactory) in the type HibernateTransactionManager is not applicable for the arguments (LocalSessionFactoryBean)`

So, I created a sessionFactory like below

@Bean
@Autowired
public SessionFactory sessionFactory(DataSource dataSource) {
    LocalSessionFactoryBuilder sessionFactory = new LocalSessionFactoryBuilder(dataSource);
    sessionFactory.addProperties(hibernateProperties());
    sessionFactory.scanPackages("dto");
    return sessionFactory.buildSessionFactory();

}

and passed to trasactionManager It worked.

My question is how spring autowired the sessionFactory object even if there is no no sessionFactory instance present in the 1st approach?

Upvotes: 2

Views: 2059

Answers (1)

Vlad Mihalcea
Vlad Mihalcea

Reputation: 153780

You need to change the method return types from SessionFactory to HibernateTransactionManager.

This is how it should look like:

@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory s) {
   HibernateTransactionManager txManager = new HibernateTransactionManager();
   txManager.setSessionFactory(s);
   return txManager;
}

@Bean
public SessionFactory sessionFactory() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.show_sql", "true")
    properties.setProperty("hibernate.cache.region.factory_class", "org.hibernate.cache.ehcache.EhCacheRegionFactory")
    properties.setProperty("hibernate.cache.use_query_cache", "true")
    properties.setProperty("hibernate.cache.use_second_level_cache", "true")
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.HSQLDialect")

    return new LocalSessionFactoryBuilder(dataSource())
        .scanPackages("dto")
        .addProperties(properties)
        .buildSessionFactory();
}

Upvotes: 4

Related Questions