JPA entity with @Entity annotation in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a JPA entity class with the correct annotation.

Spring Boot

import jakarta.persistence.[1];

@[1]
public class User {
    private Long id;
    private String name;
}

Drag options to blanks, or click blank then click option'

AEntity

BTable

CColumn

DId

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Table instead of @Entity

Forgetting to import the annotation

Using @Id instead of @Entity

The @Entity annotation marks the class as a JPA entity, which means it maps to a database table.

2fill in blank

medium

Complete the code to mark the primary key field with the correct annotation.

Spring Boot

import jakarta.persistence.Entity;
import jakarta.persistence.[1];

@Entity
public class Product {
    @[1]
    private Long id;
    private String name;
}

Drag options to blanks, or click blank then click option'

ATable

BColumn

CGeneratedValue

DId

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Column instead of @Id

Not annotating the primary key field

Using @Table on a field

The @Id annotation marks the field as the primary key of the entity.

3fill in blank

hard

Fix the error in the code by choosing the correct annotation to generate the primary key value automatically.

Spring Boot

import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.[1];

@Entity
public class Order {
    @Id
    @[1]
    private Long id;
    private String product;
}

Drag options to blanks, or click blank then click option'

AColumn

BTable

CGeneratedValue

DEntity

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Column instead of @GeneratedValue

Forgetting to add @GeneratedValue for auto-generation

Using @Table on a field

The @GeneratedValue annotation tells JPA to generate the primary key value automatically.

4fill in blank

hard

Fill both blanks to complete the JPA entity with a primary key and a column annotation.

Spring Boot

import jakarta.persistence.Id;
import jakarta.persistence.[1];
import jakarta.persistence.[2];

@[1]
public class Customer {
    @Id
    private Long id;
    @[2](name = "customer_name")
    private String name;
}

Drag options to blanks, or click blank then click option'

AEntity

BTable

CColumn

DId

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Table instead of @Entity

Using @Id instead of @Column on the name field

Forgetting to import the annotations

@Entity marks the class as a JPA entity. @Column customizes the mapping of the field to the database column.

5fill in blank

hard

Fill all three blanks to complete the JPA entity with @Entity, @Id, and @GeneratedValue annotations.

Spring Boot

import jakarta.persistence.[1];
import jakarta.persistence.[2];
import jakarta.persistence.[3];

@[1]
public class Invoice {
    @[2]
    @[3]
    private Long id;
    private Double amount;
}

Drag options to blanks, or click blank then click option'

AEntity

BId

CGeneratedValue

DColumn

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up @Column with @Id or @GeneratedValue

Forgetting to annotate the primary key

Not importing the correct annotations

@Entity marks the class as a JPA entity. @Id marks the primary key field. @GeneratedValue tells JPA to generate the key automatically.