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Hibernate Interview Questions and Answers

Ques 11. What the Core interfaces are of hibernate framework?

Ans. There are many benefits from these. Out of which the following are the most important one.

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.

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.

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.

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.

Query and Criteria Interface : This interface allows the user to perform queries and also control the flow of the query execution.

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Ques 12. What are Callback interfaces?
Ans. 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.
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Ques 13. What should SessionFactory be placed so that it can be easily accessed?
Ans. As far as it is compared to J2EE environment, if the SessionFactory is placed in JNDI then it can be easily accessed and shared between different threads and various components that are hibernate aware. You can set the SessionFactory to a JNDI by configuring a property hibernate.session_factory_name in the hibernate.properties file.
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Ques 14. What are POJOs?
Ans. POJO stands for plain old java objects. These are just basic JavaBeans that have defined setter and getter methods for all the properties that are there in that bean. Besides they can also have some business logic related to that property. Hibernate applications works efficiently with POJOs rather then simple java classes.
Use setter when you need to mutate/set some values in bean object. 
Use getter when you need to get values from bean.
In Hibernate, after creating the bean object you should set values to bean and save or update bean object to session or after setting you can get values from bean if you want to fetch bean data.
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Ques 15. What is object/relational mapping metadata?
Ans. ORM tools require a metadata format for the application to specify the mapping between classes and tables, properties and columns, associations and foreign keys, Java types and SQL types. This information is called the object/relational mapping metadata. It defines the transformation between the different data type systems and relationship representations.
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