Spring Boot Data Persistence with JPA 2

Question 1

Which annotation marks a field as the primary key in a JPA entity?

Accepted Answer

@Id

Answer

@Id designates the field as the entity's primary key in JPA.

Question 2

What does the `cascade = CascadeType.ALL` attribute do in a JPA relationship?

Accepted Answer

Propagates all persistence operations from parent to child

Answer

CascadeType.ALL propagates persist, merge, remove, refresh, and detach operations from the owning entity to related entities.

Question 3

Which Spring Data JPA method naming convention generates a query that finds entities by two fields using AND logic?

Accepted Answer

findByFieldOneAndFieldTwo

Answer

Spring Data JPA parses method names using keywords like 'And' to combine conditions in the generated query.

Question 4

What is the purpose of `@Column(nullable = false)` in a JPA entity?

Accepted Answer

Adds a NOT NULL constraint to the database column

Answer

`nullable = false` instructs the schema generation tool to add a NOT NULL constraint to the mapped column.

Question 5

Which `FetchType` loads a collection only when it is accessed for the first time?

Accepted Answer

FetchType.LAZY

Answer

FetchType.LAZY defers loading of a related collection until the application explicitly accesses it.

Spring Boot Practice Test