Spring Boot

Build production-grade Java applications — 69 topics across 16 chapters covering IoC, REST APIs, data access, security, and microservices.

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69

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16

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20h

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1

Spring Fundamentals

5 topics

0% done

1What is the Spring Framework? IoC Container Explained 2Dependency Injection — Constructor vs Field vs Setter 3Bean Lifecycle — How Spring Creates and Destroys Beans 4Spring Application Context — The Heart of Spring 5Component Scanning and Stereotype Annotations (@Component, @Service, @Repository)

2

Spring Boot Project Setup & Auto-Configuration

4 topics

0% done

1Creating a Spring Boot Project — Spring Initializr Explained 2Spring Boot Auto-Configuration — How It Works Under the Hood 3application.properties vs application.yml — Full Configuration Guide 4Spring Boot Profiles — dev, staging, prod Configuration

3

Building REST APIs

5 topics

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1@RestController, @RequestMapping, and HTTP Method Annotations 2@PathVariable, @RequestParam, @RequestBody — Handling Request Data 3ResponseEntity — Full Control Over HTTP Responses 4DTOs and MapStruct — Separating API Contracts from Domain Models 5API Versioning Strategies — URL, Header, and Content Negotiation

4

Validation & Exception Handling

4 topics

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1Bean Validation with @Valid and Jakarta Validation Constraints 2Custom Validators — Writing Your Own Validation Logic 3@ControllerAdvice and @ExceptionHandler — Global Exception Handling 4RFC 7807 Problem Details — Standardized Error Responses

5

Spring Data JPA & Hibernate

6 topics

0% done

1JPA and Hibernate Fundamentals — ORM Explained 2Entity Mapping — @Entity, @Table, @Column, Relationships 3Spring Data JPA Repositories — JpaRepository, Query Methods 4JPQL and @Query — Writing Custom Queries 5N+1 Problem — Detection, Diagnosis, and Fix 6Pagination and Sorting — Handling Large Datasets

6

Transactions & Concurrency

4 topics

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1@Transactional — How Spring Manages Database Transactions 2Transaction Propagation — REQUIRED, REQUIRES_NEW, NESTED and When to Use Each 3Optimistic vs Pessimistic Locking — Preventing Data Corruption 4Database Migrations with Flyway — Schema Version Control

7

Spring Security

5 topics

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1Spring Security Architecture — Filters, AuthenticationManager, SecurityContext 2Form Login and HTTP Basic Authentication 3Password Encoding — BCrypt and Why Plain Passwords Are Dangerous 4Method-Level Security — @PreAuthorize, @PostAuthorize 5CORS Configuration — Allowing Cross-Origin Requests Safely

8

JWT & OAuth2

4 topics

0% done

1JWT — Structure, Signing, Verification, and Expiry 2Implementing JWT Authentication in Spring Boot — End to End 3OAuth2 — Authorization Code Flow Explained Simply 4Spring Security OAuth2 Resource Server — Protecting APIs with Tokens

9

Caching with Redis

4 topics

0% done

1Why Caching Exists and When to Use It 2Spring Cache Abstraction — @Cacheable, @CacheEvict, @CachePut 3Redis as a Cache Backend — Setup and Configuration 4Cache Invalidation Strategies — TTL, Event-Based, Manual

10

Kafka Integration

4 topics

0% done

1Spring Kafka Overview — Producer and Consumer Setup 2@KafkaListener — Consuming Messages in Spring Boot 3KafkaTemplate — Producing Messages with Headers and Keys 4Error Handling and Dead Letter Topics in Spring Kafka

11

Microservices Architecture

5 topics

0% done

1Monolith vs Microservices — Trade-offs and When to Split 2Communication Patterns — REST (sync) vs Events (async)3Inter-Service REST Calls — RestTemplate vs WebClient vs OpenFeign 4OpenFeign — Declarative HTTP Clients 5The 12-Factor App — Principles Every Microservice Must Follow

12

Service Discovery & API Gateway

4 topics

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1Service Discovery — Why Hardcoded URLs Don't Work at Scale 2Netflix Eureka — Registering and Discovering Services 3Spring Cloud Gateway — Dynamic Routing and Filters 4Rate Limiting and Circuit Breakers at the Gateway

13

Distributed Transactions & Resilience

4 topics

0% done

1The Problem with Distributed Transactions — Why 2PC Fails 2The Saga Pattern in Spring Boot — Choreography and Orchestration 3Resilience4j — Circuit Breaker, Retry, and Bulkhead 4The Outbox Pattern — Guaranteed Event Publishing Without 2PC

14

Observability & Performance Tuning

5 topics

0% done

1Spring Boot Actuator — Health, Metrics, and Management Endpoints 2Micrometer + Prometheus + Grafana — Full Observability Setup 3Distributed Tracing with Micrometer Tracing and Zipkin 4Connection Pool Tuning — HikariCP Configuration for Production 5JVM Tuning for Spring Boot — Heap, GC, and Memory Settings

15

Docker & Kubernetes Deployment

4 topics

0% done

1Dockerizing a Spring Boot Application — Optimal Dockerfile 2Docker Compose for Local Development — App + DB + Redis + Kafka 3Deploying to Kubernetes — Deployment, Service, ConfigMap, Secret 4Health Probes, Resource Limits, and Rolling Updates in Kubernetes

16

Interactive Enterprise Microservice Labs

2 topics

0% done

1Employee Management CRUD Microservice Lab 2E-Commerce Order Processing Enterprise Lab