Top Spring and Spring Boot Annotations: Your Ultimate Interview Handy Guide

Before annotations, Spring Framework relied heavily on XML configuration. Now, annotations have streamlined and simplified this process, offering a more intuitive approach to defining Spring configurations and behaviors. Dive into this ultimate guide to the most essential Spring and Spring Boot annotations that are a must-know for interviews and real-world applications.

Top Spring and Spring Boot Annotations: Your Ultimate Interview Handy Guide

@Component vs @Bean

@Component:

• Level: Class
• Purpose: Used at the class level; auto-detects and configures the beans using classpath scanning.

@Bean:

• Level: Method
• Purpose: Used to explicitly declare a single bean. If a class is outside the Spring container, you can create a bean of the class using @Bean.

@Autowired

• Level: Field, method, constructor
• Purpose: Used for injecting the bean. By default, it uses byType autowire.

@RequestBody

When you need to consume an object, you can use @RequestBody.

Example:

@PostMapping("/request")
public ResponseEntity postController(@RequestBody LoginForm…