Spring Boot Data Persistence with JPA 4

Question 1

What exception does Spring's `@Transactional` mechanism translate a `ConstraintViolationException` into?

Accepted Answer

DataIntegrityViolationException

Answer

Spring's persistence exception translation converts JPA/Hibernate ConstraintViolationException into DataIntegrityViolationException.

Question 2

Which `@OneToOne` fetch strategy is the default in JPA?

Accepted Answer

FetchType.EAGER

Answer

JPA defaults @OneToOne (and @ManyToOne) to FetchType.EAGER, loading the related entity immediately.

Question 3

Which Spring Boot annotation enables JPA repositories scanning in a specific package?

Accepted Answer

@EnableJpaRepositories

Answer

@EnableJpaRepositories triggers Spring Data JPA to scan for repository interfaces in the specified base package.

Question 4

What does `orphanRemoval = true` do on a JPA relationship?

Accepted Answer

Automatically deletes child entities when they are removed from the parent collection

Answer

With `orphanRemoval = true`, JPA deletes a child entity from the database when it is removed from the parent's collection.

Question 5

Which JPQL clause filters query results equivalent to SQL's WHERE keyword?

Accepted Answer

WHERE

Answer

JPQL uses the WHERE clause just like SQL to filter result sets based on conditions.

Spring Boot Practice Test