Mastering Spring Boot

A Complete Guide from Fundamentals to Production Microservices

Introduction

Chapter 1: The Java Foundation for Spring Boot

1. Why Java and Why Spring Boot Today
2. Object-Oriented Programming Essentials
3. Interfaces, Abstract Classes, and Polymorphism
4. Collections Framework and Generics
5. Exception Handling Best Practices
6. Annotations: The Language of Spring
7. Lambdas, Streams, and Modern Java
8. Records, Sealed Classes, and Recent Java Features

Chapter 2: Build Tools, Dependencies, and Project Setup

1. Maven vs Gradle: Choosing Your Build Tool
2. Maven Fundamentals and POM Configuration
3. Gradle Fundamentals and Build Scripts
4. Dependency Management Strategies
5. Managing Versions and Dependency Conflicts
6. Project Structure Conventions

Chapter 3: Web Fundamentals for Spring Boot Developers

1. HTTP Protocol Essentials
2. REST Architecture and API Design Principles
3. JSON and Data Serialization
4. SQL Fundamentals and Relational Databases
5. Database Clients and Connection Basics
6. API Clients and Testing Tools

Chapter 4: Spring Framework Core Concepts

1. Inversion of Control and Dependency Injection
2. The Spring Application Context
3. Beans: Definition, Scopes, and Lifecycle
4. Component Scanning and Stereotype Annotations
5. Configuration with Java Config and XML
6. Profiles and Conditional Configuration
7. Externalized Configuration and Properties

Chapter 5: Spring Boot Fundamentals

1. What Spring Boot Solves and How It Works
2. Creating Projects with Spring Initializr
3. Auto-Configuration Mechanics
4. Starters: Curated Dependency Sets
5. Embedded Servlet Containers
6. Configuration Properties and Binding
7. Running, Packaging, and Distributing Applications

Chapter 6: Building REST APIs with Spring MVC

1. Spring MVC Architecture Overview
2. Controllers and Request Mapping
3. Path Variables, Query Parameters, and Request Bodies
4. Response Types and Content Negotiation
5. Input Validation with Bean Validation
6. Global Exception Handling
7. Filters, Interceptors, and Handler Mappings
8. File Uploads and Downloads

Chapter 7: Designing Professional REST APIs

1. RESTful API Design Principles in Practice
2. Resource Modeling and Naming Conventions
3. Pagination, Sorting, and Filtering
4. API Versioning Strategies
5. OpenAPI Documentation with SpringDoc
6. HATEOAS for Hypermedia APIs
7. CORS Configuration and Cross-Origin Security

Chapter 8: Data Access with Spring Data JPA

1. JPA and Hibernate Fundamentals
2. Entity Mapping and Relationships
3. Spring Data Repositories and Derived Queries
4. Custom Queries with JPQL and Native SQL
5. Specifications and Dynamic Queries
6. Transaction Management
7. Database Migrations with Flyway and Liquibase
8. Connection Pooling and Performance

Chapter 9: Advanced Data Access Patterns

1. Optimistic and Pessimistic Locking
2. Lazy Loading, Eager Loading, and N+1 Problems
3. Second-Level Cache and Query Cache
4. Batch Operations and Bulk Updates
5. When to Consider NoSQL Options
6. Database Indexing Strategies for JPA

Chapter 10: Security with Spring Security

1. Spring Security Architecture Overview
2. Authentication and Authorization Fundamentals
3. Password Encoding and User Details Service
4. Session Management and CSRF Protection
5. Method-Level Security
6. OAuth 2.0 and OpenID Connect
7. JWT-Based API Authentication
8. Resource Servers and Token Validation
9. Security in Production: Best Practices

Chapter 11: Application Architecture and Design Patterns

1. Layered Architecture in Spring Boot
2. Domain-Driven Design Concepts for Spring
3. The Repository Pattern Deep Dive
4. DTOs, Mappers, and Separation of Concerns
5. SOLID Principles in Practice
6. Modular Monolith Organization
7. Hexagonal and Clean Architecture Approaches

Chapter 12: Testing Spring Boot Applications

1. Testing Philosophy and Pyramid
2. Unit Testing with JUnit and Mockito
3. Integration Testing with Spring Boot Test
4. Web Layer Testing with MockMvc
5. Database Testing with Testcontainers
6. Security Testing Strategies
7. API Contract Testing
8. Test Configuration, Profiles, and Fixtures

Chapter 13: Async Processing, Messaging, and Events

1. Scheduled Tasks and Async Methods
2. Spring Application Events
3. Message Brokers: Kafka vs RabbitMQ
4. Producer and Consumer Patterns with Kafka
5. Event-Driven Architecture with Spring
6. Retries, Dead-Letter Queues, and Idempotency
7. Transaction Boundaries in Distributed Systems

Chapter 14: Caching, Performance, and Optimization

1. Spring Cache Abstraction
2. Redis Integration for Distributed Caching
3. Cache Invalidation Strategies
4. JVM Tuning and Memory Management
5. Connection Pooling Optimization
6. Application Profiling Techniques
7. Concurrency and Thread Management

Chapter 15: Observability, Logging, and Monitoring

1. Structured Logging Best Practices
2. Logback Configuration and Levels
3. Spring Boot Actuator Endpoints
4. Metrics with Micrometer
5. Health Checks and Liveness Probes
6. Distributed Tracing Concepts
7. Correlation IDs and Request Tracking
8. Alerting and Production Diagnostics

Chapter 16: Integration Patterns and External Services

1. REST Clients with WebClient and RestTemplate
2. Resilience Patterns: Retries, Timeouts, Circuit Breakers
3. Rate Limiting and Backpressure
4. Spring Batch for Batch Processing
5. File Storage Strategies
6. Email Integration
7. Webhooks and Callback Handling

Chapter 17: Microservices with Spring Boot

1. Monolith vs Microservices Decision Framework
2. Service Decomposition Strategies
3. Inter-Service Communication Patterns
4. API Gateways and Routing
5. Service Discovery and Registry
6. Centralized Configuration Management
7. Distributed Tracing Across Services
8. Security in Microservice Architectures

Chapter 18: Containerization, Orchestration, and Cloud Deployment

1. Docker Fundamentals for Java Applications
2. Writing Efficient Dockerfiles for Spring Boot
3. Multi-Stage Builds and Layer Optimization
4. Kubernetes Deployment Basics
5. Health Probes and Liveness Checks
6. Configuration and Secrets in Kubernetes
7. Scaling Strategies and Rolling Updates
8. Cloud Deployment Patterns

Chapter 19: CI/CD and Release Engineering

1. Git Workflow Strategies for Teams
2. Build Pipeline Configuration
3. Automated Testing in Pipelines
4. Artifact Management and Versioning
5. Environment Promotion Strategies
6. Blue-Green and Canary Deployments
7. Rollback Strategies and Safety Nets
8. Infrastructure as Code Considerations

Chapter 20: Advanced Spring Boot Development

1. Custom Auto-Configuration Deep Dive
2. Building Your Own Starters
3. Advanced Bean Scopes and Lifecycle Hooks
4. Aspect-Oriented Programming with Spring AOP
5. Custom Annotations and Meta-Annotations
6. GraalVM Native Compilation
7. Reactive Programming with WebFlux
8. When to Choose Reactive Over MVC

Chapter 21: Configuration Management Mastery

1. Properties Files and YAML Configuration
2. @ConfigurationProperties and Binding
3. Profiles and Environment-Specific Config
4. Environment Variables and Command-Line Overrides
5. Configuration Precedence Rules
6. Externalized Configuration Sources
7. Secrets Management Strategies
8. Configuration Validation at Startup

Chapter 22: Troubleshooting and Production Operations

1. Startup Failures and Dependency Conflicts
2. Bean Creation Errors and Circular Dependencies
3. Database Connection and Transaction Problems
4. Security Configuration Issues
5. REST API Debugging Techniques
6. Performance Bottleneck Diagnosis
7. Memory Leaks and GC Tuning
8. Concurrency Issues
9. Deployment Failures and Container Problems
10. Production Incident Response Procedures

Conclusion

References