How do I get the value of the jdbc.batch_size property at runtime for a Web application using Spring MVC and Hibernate?

Question

According to what I have found so far, I can use the following code:

    LocalSessionFactoryBean sessionFactory = (LocalSessionFactoryBean)super.getApplicationContext().getBean("&sessionFactory");
    System.out.println(sessionFactory.getConfiguration().buildSettings().getJdbcBatchSize());

but then I get a Hibernate Exception:

org.hibernate.HibernateException: No local DataSource found for configuration - dataSource property must be set on LocalSessionFactoryBean

Can somebody shed some light?

Answer 1

Try the following (I can't test it since I don't use Spring):

System.out.println(sessionFactory.getConfiguration().getProperty("hibernate.jdbc.batch_size"))

Answer 2

On the versions of Hibernate that I've checked, getConfiguration is not a public method of SessionFactory. In a few desperate cases, I've cast a Session or SessionFactory into its underlying implementation to get at some values that weren't publicly available. In this case that would be:

((SessionFactoryImplementor)sessionFactory).getSettings().getJdbcBatchSize()

Of course, that's dangerous because it could break if they change the implementation. I usually only do this for optimizations that I can live without and then wrap the whole thing in a try/catch Throwable block just to make sure it won't hurt anything if it fails. A better idea might be to set the value yourself when you initialize Hibernate so you already know what it is from the beginning.