I have a JPA Repository method that should return a List, but it returns null instead of an empty list when no results are found. ```java public inte...

I want to write unit tests for my REST controllers in Spring Boot. I've heard about @WebMvcTest but I'm not sure how to use it properly. How do I: 1....

I am new to Java development and I keep hearing about Spring and Spring Boot. What exactly is the difference between them? I understand that Spring i...

I want to handle all exceptions in one place in my Spring Boot application instead of using try-catch in every controller method. What's the best pra...

I want to use Spring Boot Actuator to monitor my application in production. I added the dependency but all endpoints are exposed. How do I: 1. Enable...

I'm building a REST API and need to validate the request body. I have a UserDTO class: ```java public class UserDTO { private String email; p...

I need to configure different database settings for dev, test, and production environments in my Spring Boot application. What's the best way to use ...

I'm getting this error when trying to access a collection after fetching an entity: ``` org.hibernate.LazyInitializationException: failed to lazily i...

I have a Spring Boot backend running on localhost:8080 and a React frontend on localhost:3000. When I try to make API calls from React, I get: ``` Ac...

I've seen two ways to inject dependencies in Spring Boot: ```java // Field Injection @Autowired private UserService userService; // Constructor Inje...