Spring Framework Spring Data & JPA

Question 1

Which annotation marks a Java class as a JPA entity that can be persisted in a relational database?

Accepted Answer

@Entity

Answer

@Entity designates a Java class as a JPA entity, mapping it to a database table for persistence.

Question 2

Which Spring Data interface provides the minimum set of CRUD operations for a repository?

Accepted Answer

CrudRepository

Answer

CrudRepository defines the core CRUD methods (save, findById, findAll, delete, count) that all Spring Data repositories can extend.

Question 3

What does the @GeneratedValue annotation configure when used alongside @Id in a JPA entity?

Accepted Answer

The strategy used to generate primary key values

Answer

@GeneratedValue specifies the strategy (AUTO, IDENTITY, SEQUENCE, TABLE) used to automatically generate primary key values.

Question 4

Which annotation is used in a Spring Data JPA repository interface to define a custom JPQL or native SQL query?

Accepted Answer

@Query

Answer

@Query allows you to define a custom JPQL or native SQL query directly on a repository method using its value or nativeQuery attributes.

Question 5

What is the primary effect of applying @Transactional to a Spring service method?

Accepted Answer

The method executes within a database transaction, with automatic commit or rollback

Answer

@Transactional wraps the method in a database transaction, automatically committing on success or rolling back on exception.

Spring Framework Practice Test