Top 30 Hibernate Interview Questions and Answers

Many-to-many relationship in Hibernate without common columns

• Create a third table with foreign keys to both tables

• Use @ManyToMany annotation in both entity classes

• Specify the join table name and column names in @JoinTable annotation

JDBC is a low-level API for connecting to databases, while Hibernate is a high-level ORM framework.

• JDBC requires manual coding for CRUD operations, while Hibernate provides automatic mapping of objects to database tables.

• JDBC is more suitable for sma...read more

Lazy loading is a design pattern in Hibernate where data is loaded only when it is requested.

• Lazy loading helps improve performance by loading data only when needed.

• It is commonly used in Hibernate to delay the loading of associated objects until the...read more

The merge() method of the Hibernate session is useful when you want to update the state of an object and persist it in the database.

• Merge() method is used to update the state of a detached object and synchronize it with the database.

• It is useful when...read more

Lazy loading in Hibernate is a technique used to load data only when it is needed, improving performance.

• Lazy loading is achieved by setting the fetch type to LAZY in the mapping of the entity relationship.

• When an entity is loaded, associated entitie...read more

Hibernate in Spring is an ORM tool that simplifies database operations by mapping Java objects to database tables.

• Hibernate is an ORM (Object-Relational Mapping) tool used in Spring framework

• It simplifies database operations by mapping Java objects t...read more

Transaction management in Hibernate ensures data integrity and consistency during database operations.

• Hibernate uses the concept of sessions to manage transactions.

• A transaction begins with session.beginTransaction() and ends with commit() or rollbac...read more

Transaction propagation in Hibernate allows the management of multiple database operations within a single transaction.

• Hibernate supports different transaction propagation modes such as REQUIRED, REQUIRES_NEW, SUPPORTS, MANDATORY, NOT_SUPPORTED, and ...read more

Database can be created through Hibernate by defining entity classes, mapping them to database tables, configuring Hibernate properties, and using Hibernate API to interact with the database.

• Define entity classes representing tables in the database

• Ma...read more

Hibernate many to many mapping allows for a relationship where multiple instances of one entity are related to multiple instances of another entity.

• Use @ManyToMany annotation in Hibernate to establish many to many relationship between entities

• Create ...read more

Rollback in Hibernate is used to undo the changes made to the database during a transaction.

• Rollback is used to revert any changes made to the database within a transaction if an error occurs.

• It is typically called in catch block of try-catch-finally...read more

JPA is a specification while Hibernate is an implementation of JPA. JPA provides a standard API for ORM frameworks.

• JPA is a standard API for ORM frameworks

• JPA provides a vendor-neutral interface

• JPA allows for easy switching between ORM frameworks

• Hibe...read more

Session Factory is a factory class that creates Session objects for Hibernate.

• Session Factory is responsible for creating and managing Session objects.

• It is a thread-safe object and should be created only once per application.

• It is typically created ...read more

Spring JPA is a part of the Spring Data project that makes it easier to work with JPA. Hibernate is a popular ORM framework.

• Spring JPA is a higher level abstraction on top of JPA, providing more features and simplifying development.

• Hibernate is a pow...read more

Different types of object relations in Hibernate include one-to-one, one-to-many, many-to-one, and many-to-many.

• One-to-one: Each record in one table is related to only one record in another table.

• One-to-many: Each record in one table can be related t...read more

Hibernate is an ORM tool that maps Java classes to database tables.

• Hibernate simplifies database access by abstracting the underlying SQL queries.

• It provides a way to map Java classes to database tables using annotations or XML files.

• Hibernate suppor...read more

getSession() retrieves the current session while load() method loads the object by its identifier.

• getSession() method is used to retrieve the current session from the session factory.

• load() method is used to load the object by its identifier.

• getSessi...read more

Hibernate is better than JDBC due to its object-relational mapping capabilities, automatic table creation, and improved performance.

• Hibernate provides object-relational mapping (ORM) which simplifies database interactions by mapping Java objects to d...read more

Dialect in Hibernate is a configuration setting that defines the type of database used.

• Dialect is responsible for generating SQL statements specific to the database.

• It handles the differences in SQL syntax and data types between different databases.

• E...read more

JPA is a specification while Hibernate is an implementation of JPA.

• JPA is a Java specification for managing relational data in applications.

• Hibernate is an ORM framework that implements the JPA specification.

• Hibernate provides additional features bey...read more

Transaction management in Hibernate ensures ACID properties for database operations.

• Hibernate provides built-in transaction management support through Session interface.

• Transactions can be managed programmatically using beginTransaction(), commit(), ...read more

Types of mapping in hibernate include one-to-one, one-to-many, many-to-one, and many-to-many mappings.

• One-to-one mapping: Each instance of one entity is associated with exactly one instance of another entity.

• One-to-many mapping: Each instance of one ...read more

Hibernate is a popular ORM framework that simplifies database interactions in Java applications by mapping Java objects to database tables.

• Hibernate is an ORM (Object-Relational Mapping) framework that simplifies database operations in Java applicati...read more

get() method returns null if the object is not found in the database, while load() method throws an exception.

• get() method is eager loading while load() method is lazy loading.

• get() method hits the database immediately while load() method hits the da...read more

JDBC is a low-level API for connecting to databases in Java, while Hibernate is a high-level ORM framework that simplifies database interactions.

• JDBC requires writing SQL queries manually, while Hibernate provides an object-oriented approach to datab...read more

Hibernate is an ORM tool that simplifies database access in Java applications.

• Hibernate maps Java classes to database tables and provides a framework for querying and manipulating data.

• It eliminates the need for writing SQL queries and handles databa...read more

Query Cache in Hibernate stores the results of queries in memory to improve performance by avoiding repeated database calls.

• Query Cache is a second-level cache in Hibernate that stores the results of queries along with the query key in memory.

• It help...read more