Hibernate Interview Questions

Hibernate Interview Questions: If you’re looking to brush up on your hibernate skills, here are some Hibernate Interview Questions that may come up. Hibernate is a popular ORM tool for Java applications – it’s often used in enterprise settings for database operations.

If you’re looking to get a job in software development, it’s essential to be familiar with the Hibernate ORM tool. Here are some Hibernate Interview Questions and answers to help you improve your knowledge. As I come across them, I’ll add more questions, so bookmark this page for future reference.

If you’re a beginner or experienced, this is the perfect platform to prepare for Hibernate job roles.
We’ll look at some of the most commonly asked Hibernate Interview Questions in interviews for Hibernate jobs.

Hibernate Interview Questions

• What is Hibernate framework?
• What is an Object Relational Mapping (ORM)?
• What is the purpose of Configuration Interface in Hibernate?
• What is Object-Relational Impedance Mismatch?
• What are the main problems of Object-Relational Impedance Mismatch?
• What are the key characteristics of Hibernate?
• Can you tell us about the core interfaces of Hibernate framework?
• How will you map the columns of a DB table to the properties of a Java class in Hibernate?
• Does Hibernate make it mandatory for a mapping file to have a .hbm.xml extension?
• What are the steps for creating a SessionFactory in Hibernate?
• Why do we use POJO in Hibernate?
• What is Hibernate Query Language (HQL)?
• How will you call a stored procedure in Hibernate?
• What is Criteria API in Hibernate?
• Why do we use Hibernate Template?
• How can you see SQL code generated by Hibernate on the console?
• What are the different types of collections supported by Hibernate?
• What is the difference between session.save() and session.saveOrUpdate() methods in Hibernate?
• What are the advantages of Hibernate framework over JDBC?
• How can we get statistics of a SessionFactory in Hibernate?
• What is the Transient state of an object in Hibernate?
• What is the Detached state of an object in Hibernate?
• What is the use of Dirty Checking in Hibernate?
• What is the purpose of the Callback interface in Hibernate?
• What are the different ORM levels in Hibernate?
• What are the different ways to configure a Hibernate application?
• What is Query Cache in Hibernate?
• What are the different types of Association mappings supported by Hibernate?
• What are the different types of Unidirectional Association mappings in Hibernate?
• What is the Unit of Work design pattern?
• In Hibernate, how can an object go in a Detached state?
• How will you order the results returned by a Criteria in Hibernate?
• How does the Example criterion work in Hibernate?
• How does Transaction management work in Hibernate?
• How can we mark an entity/collection as immutable in Hibernate?
• What are the different options to retrieve an object from the database in Hibernate?
• How can we auto-generate the primary key in Hibernate?
• How will you re-attach an object in the Detached state in Hibernate?
• What is the first level of cache in Hibernate?
• What are the different second-level caches available in Hibernate?
• Which is the default transaction factory in Hibernate?
• What are the options to disable the second-level cache in Hibernate?
• What are the different fetching strategies in Hibernate?
• What is the difference between Immediate fetching and Lazy collection fetching?
• What is ‘Extra lazy fetching’ in Hibernate?
• How can we check whether a collection is initialized under the Lazy Initialization strategy?
• What are the different strategies for cache mapping in Hibernate?
• What is the difference between a Set and a Bag in Hibernate?
• How can we monitor the performance of Hibernate in an application?
• How can we check if an Object is in a Persistent, Detached, or Transient state in Hibernate?
• What is ‘the inverse side of association’ in a mapping?
• What is ORM metadata?
• What is the difference between the load() and get() method in Hibernate?
• When should we use the get() method or load() method in Hibernate?
• What is a derived property in Hibernate?
• How can we use Named Query in Hibernate?
• What are the two locking strategies in Hibernate?
• What is the use of version number in Hibernate?
• What is the use of the session.lock() method in Hibernate?
• What are inheritance mapping strategies supported by Hibernate?
• Mention the differences between JPA and Hibernate?
• What is HQL, and what are its benefits?
• Mention the Key components of Hibernate?
• Explain the Session object in Hibernate?
• How does transaction management work in Hibernate?
• Explain the Criteria object in Hibernate?
• What is a One-to-One association in Hibernate?
• What is hibernate caching? Explain Hibernate first-level cache?
• What is the second-level cache in Hibernate?
• What are concurrency strategies?
• What is Lazy loading in hibernate?
• Explain the persistent classes in Hibernate?
• Explain some of the elements of hbm.xml?
• What is Java Persistence API (JPA)?
• What is Hibernate SessionFactory, and how to configure it?
• What is the difference between opensession and getcurrentsession in hibernate?
• What is the difference between Hibernate Session get() and load() method?
• What are the different states of an entity bean?
• What is the difference between merge() and update() methods in Hibernate?
• What is difference between Hibernate save(), saveOrUpdate() and persist() methods?
• What will happen if we don’t have a no-args constructor in Entity bean?
• What is the difference between sorted collection and ordered collection? Which one is better?
• What are the collection types in Hibernate?
• How to implement Joins in Hibernate?
• Why should we not make the Entity Class final?
• What is the benefit of native SQL query support in hibernate?
• What is Named SQL Query? What are the benefits of Named SQL Query?
• How to log hibernate generated SQL queries in log files?
• What is cascading, and what are the different types of cascading?
• How to integrate log4j logging in hibernate application?
• What is HibernateTemplate class?
• How to integrate Hibernate with Servlet or Struts2 web applications?
• Which design patterns are used in Hibernate framework?
• What is Hibernate Validator Framework?
• What is the benefit of Hibernate Tools Eclipse plugin?
• What are the technologies that Hibernate supports?
• What is your understanding of Hibernate proxy?
• Can you explain Hibernate callback interfaces?
• How to create database applications in Java with the use of Hibernate?
• Can you share your views on mapping description files?
• What are your thoughts on file mapping in Hibernate?
• Can you explain the version field?
• What are your views on the function addClass?
• Can you explain the role of addDirectory() and addjar() methods?
• What do you understand by Hibernate tuning?
• What is your understanding of Light Object Mapping?
• How does Hibernate create the database connection?
• What are possible ways to configure object-table mapping?
• Which annotation is used to declare a class as a hibernate bean?
• How do I specify a table name linked to an entity using annotation?
• How does a variable in an entity connect to the database column?
• How do we specify a different column name for the variables mapping?
• How do we specify a variable to be the primary key for the table?
• How do you configure the dialect in hibernate.cfg.xml?
• How to configure the database URL and credentials in hibernate.cfg.xml?
• How to configure the connection pool size?
• How do you configure the folder to scan for Hibernate beans?
• How to configure hibernate beans without the Spring framework?
• Is it possible to connect multiple databases in a single Java application using Hibernate?
• Does Hibernate support polymorphism?
• How many Hibernate sessions exist at any point in time in an application?
• What is N+1 SELECT problem in Hibernate? What are some strategies to solve the N+1 SELECT problem in Hibernate?
• What is the requirement for a Java object to become a Hibernate entity object?
• How do you log SQL queries issued by the Hibernate framework in the Java application?
• What is the difference between the transient, persistent, and detached state in Hibernate?
• How are properties of a class mapped to the columns of a database table in Hibernate?
• What is the usage of Configuration Interface in hibernate?
• How can we use new custom interfaces to enhance the functionality of the built-in interfaces of hibernate?
• What are POJOs, and what is their significance?
• How can we invoke stored procedures in hibernate?
• What are the benefits of using Hibernate template?
• How can we get hibernate statistics?
• How can we reduce database write action times in Hibernate?
• When an instance goes into a detached state in hibernate?
• What are the four ORM levels in hibernate?
• What is the default cache service of hibernate?
• What are the two mapping associations used in hibernate?
• What is the usage of Hibernate QBC API?
• In how many ways can a user fetch objects from the database in hibernate?
• How primary key is created by using hibernate?
• How can we reattach any detached objects in Hibernate?
• What are different ways to disable hibernate second-level cache?
• What is ORM metadata?
• Which one is the default transaction factory in hibernate?
• What is the role of JMX in hibernate?
• In how many ways can objects be identified in Hibernate?
• What are the different fetching strategies of hibernate?
• How is mapping of java objects done with database tables?
• What are derived properties in hibernate?
• What is the use of version property in hibernate?
• What is attribute-oriented programming?
• What is the use of session.lock() in hibernate?
• What are the three inheritance models of hibernate?
• What is general hibernate flow using RDBMS?
• What is the difference between managed associations and hibernate associations?
• What are the inheritance mapping strategies?
• What is automatic dirty checking in hibernate?
• Explain Hibernate configuration file and Hibernate mapping file?

Final Words

Thanks for checking out this list of Hibernate interview questions and answers. I hope it will help you prepare for your following interview if you’re a fresher or experienced person. If there’s anything else you’d like to see covered here, please let me know, and I’ll add it to the list.