Spring Boot Application
Table of Contents
Overview
Develop production-ready Spring Boot applications with proper annotation-based configuration, dependency injection, REST controllers, JPA data persistence, service layers, and security implementation following Spring conventions.
When to Use
- Building Spring Boot REST APIs
- Implementing service-oriented architectures
- Configuring data persistence with JPA
- Managing dependency injection
- Implementing Spring Security
- Building microservices with Spring Boot
Quick Start
Minimal working example:
<!-- pom.xml -->
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>api-service</artifactId>
<version>1.0.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.1.0</version>
</parent>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
// ... (see reference guides for full implementation)Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Spring Boot Project Setup | Spring Boot Project Setup |
| Entity Models with JPA Annotations | Entity Models with JPA Annotations |
| Repository Layer with Spring Data JPA | Repository Layer with Spring Data JPA |
| Service Layer with Business Logic | Service Layer with Business Logic |
| REST Controllers with Request/Response Handling | REST Controllers with Request/Response Handling |
| Spring Security Configuration | Spring Security Configuration |
| Application Configuration | Application Configuration |
Best Practices
✅ DO
- Use dependency injection for loose coupling
- Implement service layer for business logic
- Use repositories for data access
- Leverage Spring Security for authentication
- Use @Transactional for transaction management
- Validate input in controllers
- Return appropriate HTTP status codes
- Use DTOs for request/response mapping
- Implement proper exception handling
- Use Spring's @Async for async operations
❌ DON'T
- Put business logic in controllers
- Access database directly in controllers
- Store secrets in configuration files
- Use eager loading for large relationships
- Ignore transaction boundaries
- Return database entities in API responses
- Implement authentication in controllers
- Use raw SQL without parameterized queries
- Forget to validate user input