Hibernate Interview Questions

Show Hibernate Architecture?

What the Core interfaces are of hibernate framework?

There are many benefits from these. Out of which the following are the most important one. i. Session Interface - This is the primary interface used by hibernate applications. The instances of this interface are lightweight and are inexpensive to create and destroy. Hibernate sessions are not thread safe. ii. SessionFactory Interface - This is a factory that delivers the session objects to hibernate application. Generally there will be a single SessionFactory for the whole application and it will be shared among all the application threads. iii. Configuration Interface - This interface is used to configure and bootstrap hibernate. The instance of this interface is used by the application in order to specify the location of hibernate specific mapping documents. iv. Transaction Interface - This is an optional interface but the above three interfaces are mandatory in each and every application. This interface abstracts the code from any kind of transaction implementations such as JDBC transaction, JTA transaction. v. Query and Criteria Interface - This interface allows the user to perform queries and also control the flow of the query execution.

What are Callback interfaces?

These interfaces are used in the application to receive a notification when some object events occur. Like when an object is loaded, saved or deleted. There is no need to implement callbacks in hibernate applications, but they're useful for implementing certain kinds of generic functionality.

What are Extension interfaces?

When the built-in functionalities provided by hibernate is not sufficient enough, it provides a way so that user can include other interfaces and implement those interfaces for user desire functionality. These interfaces are called as Extension interfaces.

What are the Extension interfaces that are there in hibernate?

• There are many extension interfaces provided by hibernate.
• ProxyFactory interface - used to create proxies
• ConnectionProvider interface - used for JDBC connection management
• TransactionFactory interface - Used for transaction management
• Transaction interface - Used for transaction management
• TransactionManagementLookup interface - Used in transaction management.
• Cahce interface - provides caching techniques and strategies
• CacheProvider interface - same as Cache interface
• ClassPersister interface - provides ORM strategies
• IdentifierGenerator interface - used for primary key generation
• Dialect abstract class - provides SQL support

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