Spring Boot Components & Architecture

 

• What is Spring Boot?

  • Framework for building Java-based applications quickly and with minimal configuration.
  • Simplifies development by providing defaults for setup and configuration. Spring Interview Questions

• Key Features of Spring Boot

  • Standalone applications with embedded servers (Tomcat, Jetty, etc.).
  • Auto-configuration based on dependencies.
  • Opinionated defaults to get started quickly.

---

Architecture Overview

• Spring Boot Architecture

  • Spring Framework Core: Dependency Injection and Aspect-Oriented Programming (AOP).
  • Spring Boot Starter: Simplified setup and configuration.
  • Embedded Server: Embedded Tomcat, Jetty, or Undertow.

• Execution Flow in Spring Boot

  • Start with main class annotated with @SpringBootApplication.
  • Auto-configure dependencies based on classpath and properties.

---

Project Structure

• Typical Spring Boot Project Structure

  css
  
  ├── src/
  │   ├── main/
  │   │   ├── java/
  │   │   │   └── com.example.myproject/
  │   │   │       ├── Application.java
  │   │   │       ├── controllers/
  │   │   │       ├── services/
  │   │   │       └── repositories/
  │   │   └── resources/
  │   │       └── application.properties
  │   └── test/
  │       └── java/
  │           └── com.example.myproject/
  │               └── ApplicationTests.java
  └── pom.xml
  

• Explanation

  • Application.java: Main class annotated with @SpringBootApplication.
  • controllers/, services/, repositories/: Components structured as per Spring MVC architecture.
  • application.properties: Configuration file for application properties.

---

Execution Lifecycle

• Lifecycle of a Spring Boot Application

  1. Initialization: Bean creation and dependency injection.
  2. Auto-configuration: Configure based on dependencies.
  3. Embedded Server Startup: Start embedded server (Tomcat, Jetty).
  4. Application Running: Handle HTTP requests and responses.

• Example: Application.java

  java
  
  @SpringBootApplication
  public class Application {
      public static void main(String[] args) {
          SpringApplication.run(Application.class, args);
      }
  }
  

---

Dependency Management

• Dependency Management with Maven/Gradle

  • Starter Dependencies: Pre-configured dependencies for common use cases.
  • Parent POM: Spring Boot manages versions and dependencies.

• Example: pom.xml

  xml
  
  <dependencies>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
      <!-- Other dependencies -->
  </dependencies>
  

---

 Auto-Configuration

• Auto-Configuration in Spring Boot

  • Conditional Beans: Beans configured based on classpath and properties.
  • Application Properties: Configure behavior via application.properties or application.yml.

• Example: application.properties

  bash
  
  server.port=8080
  spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
  spring.datasource.username=root
  spring.datasource.password=secret
  

---

Spring Boot Actuator

• Monitoring and Managing Applications with Actuator

  • Health Check: /actuator/health
  • Metrics: /actuator/metrics
  • Info: /actuator/info
  • Environment: /actuator/env

• Configuration

  • Enable Actuator endpoints in application.properties.

---

Spring Boot DevTools

• Development Tools for Faster Iteration

  • Automatic Restart: Restart application on file changes.
  • Live Reload: Reload browser automatically on frontend changes.
  • Global Properties: Customization via application.properties.

• Configuration

  • Add spring-boot-devtools dependency in pom.xml.

---

 Deployment Options

• Deployment Options for Spring Boot Applications

  • JAR Packaging: Executable JAR with embedded server.
  • WAR Packaging: Deployable to traditional servlet containers (Tomcat, Jetty).

• Cloud Deployment

  • Deploy to cloud platforms (AWS, Azure, GCP) with ease.

---

Slide 10: Conclusion

• Benefits of Using Spring Boot

  • Rapid application development.
  • Simplified configuration and dependency management.
  • Support for modern Java features and libraries.

• Future Directions

  • Stay updated with Spring Boot releases and community developments.
  • Explore microservices architecture with Spring Boot.

---

Additional Tips for Presentation:

• Visuals: Use diagrams, flowcharts, and screenshots to illustrate concepts.
• Code Snippets: Include concise and relevant code examples.
• Demo: Consider a live demo or recorded demonstration of key features.
• Practice: Rehearse the presentation to ensure clarity and smooth delivery.