[Solved] What is wrong with this Spring Boot repository class? @Repository public class UserRepository { public void saveUser(String user) { // save... What is wrong with this Spring Boot repository class? | Spring Boot

Spring Boot - Spring Annotations

What is wrong with this Spring Boot repository class?

@Repository
public class UserRepository {
    public void saveUser(String user) {
        // save logic
    }
}

Options: A) Class should be an interface extending JpaRepository B) Missing @Service annotation C) @Repository cannot be used on classes D) Method saveUser must return a value

AClass should be an interface extending JpaRepository

BMissing @Service annotation

C@Repository cannot be used on classes

DMethod saveUser must return a value

Step-by-Step Solution

Solution:

Step 1: Understand typical repository pattern in Spring Boot
Spring Data JPA repositories are usually interfaces extending JpaRepository or CrudRepository to get built-in methods.
Step 2: Identify the issue with the class declaration
The class is a concrete class, not an interface extending JpaRepository, so it misses Spring Data JPA features.
Final Answer:
Class should be an interface extending JpaRepository -> Option A
Quick Check:
Repositories usually extend JpaRepository interface [OK]

Quick Trick: Repositories are interfaces extending JpaRepository, not plain classes [OK]

Common Mistakes:

Thinking @Repository cannot be on classes
Assuming @Service is needed for repositories
Believing saveUser must return a value

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What is wrong with this Spring Boot repository class?

Step 1: Understand typical repository pattern in Spring Boot

Step 2: Identify the issue with the class declaration

Final Answer:

Quick Check:

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