Spring Boot List of Annotations: A Comprehensive Guide

In today's rapidly evolving tech landscape, Spring Boot has emerged as a popular choice for building robust and maintainable Java applications. Its ease of use, flexibility, and scalability make it an ideal framework for developers of all levels. To master the art of Spring Boot development, it's essential to stay updated with its various annotations, which play a crucial role in configuring and customizing your application.

In this article, we'll delve into the world of Spring Boot annotations, exploring their uses, benefits, and best practices. Whether you're a beginner or an experienced developer, this guide will help you navigate the vast landscape of Spring Boot annotations and enhance your skills.

### Where do we define properties in the Spring Boot application?

In Spring Boot, properties are defined using `@PropertySource` annotation, which allows you to specify multiple property files that can be loaded as part of the application configuration.

### How to enable debugging log in the spring boot application?

To enable debugging logs in a Spring Boot application, you can use the `logging.level` property and set it to `DEBUG`. Additionally, you can also use the `@EnableDebugLogging` annotation on your main application class.

### How to check the environment properties in your Spring boot application?

You can access environment properties using the `@Value` annotation or by injecting the `Environment` object into your bean. For example, you can inject the `Environment` object and then use its methods to retrieve property values.

### How to get the list of all the beans in your Spring boot application?

You can use the `ApplicationContext.getBeanDefinitionNames()` method to get a list of all the beans registered in your Spring Boot application. Alternatively, you can also use the `beanFactory.getBeanNamespaces()` method to get a list of bean definitions.

### What are the actuator-provided endpoints used for monitoring the Spring boot application?

Actuator provides various endpoints that enable monitoring and management of your Spring Boot application. These endpoints include health checks, metrics, audits, and more. You can access these endpoints by appending `/actuator` to your application's URL.

### How to enable Actuator in Spring boot application?

To enable Actuator in a Spring Boot application, you need to add the `spring-boot-starter-actuator` dependency to your project. Additionally, you can also configure Actuator using the `management.endpoints.web.exposure.include` property.

### What is Spring Actuator? What are its advantages?

Spring Actuator is a module of the Spring Boot framework that provides various endpoints for monitoring and management of your application. Its advantages include improved visibility into your application's health, performance, and configuration.

### What is the use of Profiles in spring boot?

Profiles allow you to switch between different configurations or settings based on the environment your application is running in. For example, you can create a `dev` profile for development environments and a `prod` profile for production environments.

### What is the difference between RequestMapping and GetMapping?

`@RequestMapping` is used to map an HTTP request method (e.g., GET, POST) to a specific URL, while `@GetMapping` is a shortcut annotation that maps only GET requests.

### Describe the flow of HTTPS requests through the Spring Boot application?

When you send an HTTPS request to your Spring Boot application, it passes through several stages, including SSL/TLS encryption, decryption, and authentication. Your application then processes the request and sends back a response, which is encrypted using SSL/TLS.

### What is the difference between and in Spring Boot?

`@ComponentScan` is used to enable component scanning for beans annotated with specific annotations (e.g., `@Service`, `@Repository`). On the other hand, `@SpringBootApplication` is a convenience annotation that enables auto-configuration and component scanning.

### How to disable a specific auto-configuration class?

You can use the `exclude` property of the `@SpringBootApplication` annotation to exclude specific auto-configuration classes. For example, you can exclude the `WebSecurityConfigurerAdapter` class by setting `exclude = WebSecurityConfigurerAdapter.class`.

### Can we disable the default web server in the Spring boot application?

Yes, you can disable the default web server in a Spring Boot application by setting `server.servlet.context-path` to an empty string (`''`).

### Can we override or replace the Embedded tomcat server in Spring Boot?

Yes, you can override or replace the embedded Tomcat server in Spring Boot by providing your own implementation of the `ServletWebServerFactory` interface.

### What is the default port of tomcat in spring boot?

The default port for Tomcat in Spring Boot is 8080. However, you can change this port by setting the `server.port` property.

### Is it possible to change the port of the embedded Tomcat server in Spring Boot?

Yes, you can change the port of the embedded Tomcat server in Spring Boot by setting the `server.port` property.

### Can we create a non-web application in Spring Boot?

Yes, you can create a non-web application in Spring Boot by using the `SpringApplication.run()` method without specifying any web-related configurations.

### What is Spring Boot dependency management?

Spring Boot provides advanced dependency management features that simplify the process of managing dependencies for your projects.

### What Are the Basic Annotations that Spring Boot Offers?

Some basic annotations provided by Spring Boot include:

* `@SpringBootApplication`

* `@EnableAutoConfiguration`

* `@ComponentScan`

* `@Bean`

* `@Value`

### What are the most common Spring Boot CLI commands?

Some of the most common Spring Boot CLI commands include:

* `spring run`: Runs a Spring Boot application

* `spring boot:run`: Same as above, but with additional logging options

* `spring test`: Runs tests for a Spring Boot application

### What is Spring Boot CLI and what are its benefits?

Spring Boot CLI is a command-line interface tool that allows you to create and run Spring Boot applications quickly. Its benefits include faster development times, improved productivity, and reduced errors.

### How does a spring boot application get started?

A Spring Boot application gets started by using the `main` method in your application class, which initializes the Spring application context and starts the embedded web server.

### What is the purpose of using in the class files?

The `@SpringBootApplication` annotation enables auto-configuration and component scanning for beans annotated with specific annotations (e.g., `@Service`, `@Repository`).

### What is the starter dependency of the Spring boot module?

Starter dependencies are pre-configured sets of dependencies that provide a quick start to your project. For example, `spring-boot-starter-web` provides web-related dependencies.

### What are the advantages of using Spring Boot?

Some advantages of using Spring Boot include:

* Faster development times

* Improved productivity

* Reduced errors

* Simplified configuration and customization

* Enhanced scalability and performance

By mastering these basic annotations and concepts, you'll be well on your way to becoming a proficient Spring Boot developer. Whether you're building a new application or enhancing an existing one, this guide will help you navigate the world of Spring Boot with confidence.

1. `@PropertySource` annotation is used to define properties in a Spring Boot application.

2. `logging.level` property can be used to enable debugging logs.

3. `Environment` object can be injected to access environment properties.

4. Actuator provides various endpoints for monitoring and management of your Spring Boot application.

5. Profiles allow you to switch between different configurations or settings based on the environment.

In this comprehensive guide, we explored the world of Spring Boot annotations and concepts. From defining properties to enabling debugging logs, we covered a wide range of topics that will help you master the art of Spring Boot development. Whether you're a beginner or an experienced developer, this guide is designed to provide valuable insights and practical knowledge to take your skills to the next level.

References:

* 'Spring Boot Official Documentation'(https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/)

* 'Spring Boot Actuator Documentation'(https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#actuator)

* 'Spring Boot CLI Documentation'(https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#cli)