Backend Development

Exercise 3: File Transfer Application

Build a file transfer server and client that can reliably transfer files over TCP, handling large files and showing progress.

Exercise 4: Simple HTTP Server

Build a minimal HTTP/1.0 server that can serve static files and handle basic HTTP requests.

Nonblocking I/O

Nonblocking I/O allows sockets to perform operations without waiting. This is essential for handling multiple connections efficiently in a single thread.

Socket Security Fundamentals

Security is critical in network programming. This module covers fundamental security concepts and practices for socket applications.

sockets Updated 2026-02-05

How HTTPS Talks: Client and Server Communication

HTTPS is HTTP over TLS Transport Layer Security. The application data HTTP is unchanged; the difference is that it is sent over an encrypted, authenticated channel. This module explains how that channel is set up and how

Socket Programming Quick Reference

A quick reference guide for common socket programming tasks and patterns.

sockets Updated 2026-02-05

Socket Programming Comprehensive Teaching Materials

A complete educational resource for learning socket programming from fundamentals to advanced topics.

sockets Updated 2026-02-05

C Socket Examples

Minimal TCP, UDP, and HTTPS client examples matching the Python versions in ../python/.

Spring Boot Teaching Materials — Beginner to Expert

Comprehensive, classroomready materials for teaching Spring Boothttps://spring.io/projects/springboot from absolute beginners to advanced practitioners. Includes written modules and runnable code.

Spring Boot Code Examples

Working code for the Spring Boot Teaching Materials../materials/README.md.

Spring Boot Advanced Code

Corresponds to Modules 9–12 Testing, Actuator, Production Deployment, Microservices patterns.

Spring Boot Beginner Code

Corresponds to Modules 1–4 What is Spring Boot, Setup, First Application, Core Concepts.

Spring Boot Intermediate Code

Corresponds to Modules 5–8 REST APIs, Spring Data JPA, Spring Security, Configuration.

Module 1: What is Spring Boot?

Explain what Spring Boot is and why it exists Distinguish Spring Framework from Spring Boot List key features and benefits Understand “convention over configuration”

Module 2: Environment Setup

Install JDK 17+ and verify the installation Choose and set up a build tool Maven or Gradle Use Spring Initializr to generate a project Run the generated app from IDE and command line

Module 3: Your First Application

Understand the default project structure Know the role of the main class and @SpringBootApplication Create a simple REST controller and return JSON Use application.properties for basic configuration

Module 4: Core Concepts — IoC, DI, and AutoConfiguration

Explain Inversion of Control IoC and the Spring container Use Dependency Injection DI via constructor injection Understand stereotypes: @Component, @Service, @Controller, @Repository Describe how autoconfiguration works

Module 5: Building REST APIs

Map HTTP methods GET, POST, PUT, PATCH, DELETE to controller methods Use path variables, request parameters, and request bodies Handle validation and error responses Apply REST conventions status codes, resource naming

Module 6: Spring Data JPA

Define JPA entities and map them to tables Create Spring Data JPA repositories interfaces Use derived query methods and @Query Understand transactions and basic best practices

Module 7: Spring Security

Add Spring Security and understand default behavior all endpoints protected Configure permitAll / authenticated / hasRole Implement inmemory and userdetails–based authentication Protect REST APIs with stateless JWT conce

Module 8: Configuration & Profiles

Use application.properties and application.yml Activate profiles dev, test, prod and profilespecific files Inject configuration with @Value and @ConfigurationProperties Understand externalized configuration and precedenc

Module 9: Testing

Write unit tests with JUnit 5 and Mockito Test REST controllers with MockMvc Run integration tests with @SpringBootTest and Testcontainers conceptual Use test slices @WebMvcTest, @DataJpaTest for focused tests

Module 10: Actuator & Monitoring

Add Spring Boot Actuator and expose endpoints Use health, info, metrics, and env endpoints Secure actuator endpoints and customize health Understand production monitoring practices

Module 11: Production Deployment

Build a productionready executable JAR Configure for production profiles, external config, logging Understand containerization with Docker Apply basic production best practices health, security, no default passwords