How do you configure 2nd level cache in hibernate? What are the ORM levels? Define HibernateTemplate?

How do you configure 2nd level cache in hibernate?

To activate second-level caching, you need to define the hibernate.cache.provider_class property in the hibernate.cfg.xml file as follows: 

<hibernate-configuration>

 <session-factory>

    <property name="hibernate.cache.provider_class">org.hibernate.cache.EHCacheProvider</property>

        </session-factory>

    </hibernate-configuration>

By default, the second-level cache is activated and uses the EHCache provider.

What are the ORM levels?

· Pure relational (stored procedure.)

· Light objects mapping (JDBC)

· Medium object mapping

·Full object Mapping (composition, inheritance, polymorphism, persistence by reachability)

Define HibernateTemplate?

org.springframework.orm.hibernate.HibernateTemplate is a helper class which provides different methods for querying/retrieving data from the database. It also converts checked HibernateExceptions into unchecked DataAccessExceptions.