If you have used Hibernate in past then you know that one of the strongest points of the Hibernate framework is caching, which can drastically improve the performance of the Java application's persistence layer if configured and used correctly. Hibernate provides caching at many levels e.g. first level cache at Session level, second-level cache at the SessionFactory level, and query cache to cache frequently executed SQL queries. The first level cache minimizes database access for the same object. For example, if you call the get() method to access Employee object with id = 1 from one session, it will go to the database and load the object into memory, but it will also cache the object in the first-level cache.
