Spring Boot Application

Table of Contents

• Overview
• When to Use
• Quick Start
• Reference Guides
• Best Practices

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