Spring Boot Application

Table of Contents

• [Overview](#overview)

• [When to Use](#when-to-use)

• [Quick Start](#quick-start)

• [Reference Guides](#reference-guides)

• [Best Practices](#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:

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