JPA Quiz – JPA Multiple Choice Questions and Answers

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JPA Quiz – JPA Multiple Choice Questions and Answers: For those aspirants who would like to measure their grip in Java Persistence API (JPA), we have articulated this page with JPA Quiz. Give a try to the provided JPA Coding Tests and know the crucial areas where you were needed improvements. This page would be much helpful for the aspirants who were aspiring to crack the JPA Interview. It can be noted that what all the JPA Multiple Choice Questions and Answers provided here are authentic. Hence, don’t tarry to take the JPA MCQ Quiz, as by submitting your response, the JPA MCQ Quiz Answers will be displayed. If you would like to take more quizzes like JPA Online Quiz Test, do check our Technical Quiz page.

JPA Quiz – Details

JPA MCQ Quiz – Give a Try

What does JPA stand for?
a. Java Persistence Application
b. Java Persistence API
c. Java Persistence Access
d. Java Persistent Architecture
Answer: b. Java Persistence API
Explanation: JPA is an abbreviation for Java Persistence API. It is a specification for Object-Relational Mapping (ORM) in Java EE and SE environments.

Which annotation is used to mark a class as an entity in JPA?
a. @Entity
b. @Table
c. @Column
d. @Id
Answer: a. @Entity
Explanation: The @Entity annotation is used to mark a class as an entity in JPA. An entity is a persistent object that is mapped to a database table.

What is the purpose of the @Id annotation in JPA?
a. It specifies the name of the primary key column in the database table.
b. It marks a field or property as the primary key of the entity.
c. It specifies the mapping of a foreign key in a relationship.
d. It marks a field or property as nullable in the database table.
Answer: b. It marks a field or property as the primary key of the entity.
Explanation: The @Id annotation is used to mark a field or property as the primary key of the entity. The primary key uniquely identifies each record in the database table.

Which annotation is used to specify the mapping of a field or property to a column in the database table?
a. @Entity
b. @Table
c. @Column
d. @Id
Answer: c. @Column
Explanation: The @Column annotation is used to specify the mapping of a field or property to a column in the database table. It allows you to specify the column name, type, length, and other attributes.

Which of the following is not a valid fetch type in JPA?
a. EAGER
b. LAZY
c. JOIN
d. FETCH
Answer: d. FETCH
Explanation: FETCH is not a valid fetch type in JPA. The valid fetch types are EAGER and LAZY, which specify when to load related entities.

What is the purpose of the CascadeType.ALL in JPA?
a. It specifies the type of the relationship between entities.
b. It specifies the fetch type of the relationship.
c. It specifies the actions to be cascaded from parent to child entities.
d. It specifies the order in which entities are loaded.
Answer: c. It specifies the actions to be cascaded from parent to child entities.
Explanation: The CascadeType.ALL in JPA specifies the actions to be cascaded from parent to child entities. For example, if a parent entity is deleted, all related child entities will also be deleted.

Which of the following is not a valid inheritance strategy in JPA?
a. SINGLE_TABLE
b. TABLE_PER_CLASS
c. JOINED
d. MULTI_TABLE
Answer: d. MULTI_TABLE
Explanation: MULTI_TABLE is not a valid inheritance strategy in JPA. The valid inheritance strategies are SINGLE_TABLE, TABLE_PER_CLASS, and JOINED.

Which annotation is used to specify the mapping of a Many-to-Many relationship in JPA?
a. @ManyToOne
b. @OneToMany
c. @OneToOne
d. @ManyToMany
Answer: d. @ManyToMany
Explanation: The @ManyToMany annotation is used to specify the mapping of a Many-to-Many relationship in JPA. It allows you to specify the join table, the foreign keys, and other attributes.

Which of the following is not a valid entity state in JPA?
a. NEW
b. MANAGED
c. DETACHED
d. PENDING
Answer: d. PENDING

Explanation: PENDING is not a valid entity state in JPA. The valid entity states are NEW, MANAGED, DETACHED, and REMOVED. These states represent the lifecycle of an entity in JPA.

What is the purpose of the @NamedQuery annotation in JPA?
a. It specifies a named query that can be used to retrieve entities.
b. It specifies the order in which entities are loaded.
c. It specifies the mapping of a foreign key in a relationship.
d. It specifies the fetch type of the relationship.
Answer: a. It specifies a named query that can be used to retrieve entities.
Explanation: The @NamedQuery annotation in JPA specifies a named query that can be used to retrieve entities. Named queries allow you to define queries that can be reused throughout your application.

What is the difference between a One-to-One and a Many-to-One relationship in JPA?
a. A One-to-One relationship is bidirectional, while a Many-to-One relationship is unidirectional.
b. A One-to-One relationship is unidirectional, while a Many-to-One relationship is bidirectional.
c. A One-to-One relationship maps to a single foreign key column, while a Many-to-One relationship maps to multiple foreign key columns.
d. A One-to-One relationship maps to multiple foreign key columns, while a Many-to-One relationship maps to a single foreign key column.
Answer: b. A One-to-One relationship is unidirectional, while a Many-to-One relationship is bidirectional.
Explanation: In JPA, a One-to-One relationship is unidirectional, meaning that only one entity has a reference to the other entity. In contrast, a Many-to-One relationship is bidirectional, meaning that both entities have a reference to each other.

Which annotation is used to specify the order of elements in a collection in JPA?
a. @OrderBy
b. @Order
c. @SortBy
d. @Sort
Answer: a. @OrderBy
Explanation: The @OrderBy annotation is used to specify the order of elements in a collection in JPA. It allows you to specify the name of a property to sort by.

Which of the following is not a valid mapping type for a field or property in JPA?
a. @Basic
b. @Transient
c. @Embeddable
d. @Persistent
Answer: d. @Persistent
Explanation: @Persistent is not a valid mapping type for a field or property in JPA. The valid mapping types are @Basic, @Transient, and @Embeddable.

What is the purpose of the @Version annotation in JPA?
a. It specifies the version number of an entity.
b. It specifies the type of the relationship between entities.
c. It specifies the fetch type of the relationship.
d. It specifies the mapping of a foreign key in a relationship.
Answer: a. It specifies the version number of an entity.
Explanation: The @Version annotation in JPA specifies the version number of an entity. This allows JPA to detect conflicts when multiple users are updating the same entity simultaneously.

What is the purpose of the EntityManager in JPA?
a. It provides a way to query the database and retrieve entities.
b. It manages the lifecycle of entities and performs CRUD operations.
c. It specifies the type of the relationship between entities.
d. It specifies the fetch type of the relationship.
Answer: b. It manages the lifecycle of entities and performs CRUD operations.
Explanation: The EntityManager in JPA manages the lifecycle of entities and performs CRUD (Create, Read, Update, Delete) operations. It provides a way to persist entities to the database and retrieve them.

Which of the following is true about CascadeType.ALL in JPA?
a. It specifies that all operations on the parent entity should be cascaded to the child entities.
b. It specifies that all operations on the child entities should be cascaded to the parent entity.
c. It specifies that only the CREATE operation should be cascaded to the child entities.
d. It specifies that only the DELETE operation should be cascaded to the child entities.
Answer: a. It specifies that all operations on the parent entity should be cascaded to the child entities.
Explanation: CascadeType.ALL in JPA specifies that all operations on the parent entity (such as create, update, and delete) should be cascaded to the child entities.

What is the purpose of the @GeneratedValue annotation in JPA?
a. It specifies the name of the generator used to generate primary key values.
b. It specifies the type of the relationship between entities.
c. It specifies the fetch type of the relationship.
d. It specifies the mapping of a foreign key in a relationship.
Answer: a. It specifies the name of the generator used to generate primary key values.
Explanation: The @GeneratedValue annotation in JPA specifies the name of the generator used to generate primary key values. There are different types of generators available in JPA, such as the IDENTITY, TABLE, and SEQUENCE generators.

Which of the following is true about the FetchType.LAZY in JPA?
a. It specifies that related entities should be loaded eagerly.
b. It specifies that related entities should be loaded lazily.
c. It specifies the type of the relationship between entities.
d. It specifies the fetch type of the relationship.
Answer: b. It specifies that related entities should be loaded lazily.
Explanation: The FetchType.LAZY in JPA specifies that related entities should be loaded lazily, meaning that the related entities are not loaded from the database until they are actually accessed.

Which of the following is true about the CascadeType.REMOVE in JPA?
a. It specifies that all operations on the parent entity should be cascaded to the child entities.
b. It specifies that all operations on the child entities should be cascaded to the parent entity.
c. It specifies that only the CREATE operation should be cascaded to the child entities.
d. It specifies that only the DELETE operation should be cascaded to the child entities.
Answer: d. It specifies that only the DELETE operation should be cascaded to the child entities.
Explanation: CascadeType.REMOVE in JPA specifies that only the DELETE operation should be cascaded to the child entities.

What is the purpose of the @IdClass annotation in JPA?
a. It specifies the primary key column of an entity.
b. It specifies the name of the generator used to generate primary key values.
c. It specifies the composite primary key class for an entity.
d. It specifies the mapping of a foreign key in a relationship.
Answer: c. It specifies the composite primary key class for an entity.
Explanation: The @IdClass annotation in JPA specifies the composite primary key class for an entity. This allows you to define a composite primary key that consists of multiple fields or properties.

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