Learn SPRING-BOOT with Real Code Examples
Updated Nov 25, 2025
Architecture
Layered architecture (Controller-Service-Repository)
Embedded servlet container
Dependency injection for components
Auto-configuration based on classpath
Integration with Spring ecosystem modules
Rendering Model
Client sends HTTP request -> Spring Boot embedded server
DispatcherServlet routes request to controller
Controller processes request and calls service layer
Service interacts with repository/database
Response sent back to client
Architectural Patterns
Layered architecture (Controller-Service-Repository)
Dependency injection and Inversion-of-Control
Auto-configuration for environment detection
Embedded servlet container
Integration with Spring modules and extensions
Real World Architectures
REST APIs for web/mobile apps
Microservices with Spring Cloud
Enterprise backend for banking/finance
Authentication and authorization services
Cloud-native applications with Kubernetes
Design Principles
Convention-over-configuration
Rapid development with auto-configuration
Embedded servers for standalone deployment
Integration-friendly with Spring ecosystem
Production-ready defaults (metrics, monitoring, logging)
Scalability Guide
Deploy multiple instances behind load balancer
Use caching for database queries
Horizontal scaling with microservices
Monitor performance via Actuator
Optimize startup with lazy initialization
Migration Guide
Adapt from Spring MVC to Boot by adding `@SpringBootApplication`
Use Spring Boot starters for dependencies
Configure properties in `application.yml` or `.properties`
Refactor controllers, services, repositories
Test endpoints and database integration