Practical! Spring Data JPA

Learn database design systematically through three stages: conceptual, logical, and physical, and strengthen your capabilities with a practical shopping mall project. Acquire real-world expertise through modern design techniques and the latest trends.

Learn the essential fundamentals of SQL and databases needed for practical work. Not only developers, but also product managers and data analysts can learn SQL in depth.

You can understand and master all the web technologies required to develop web applications from the basics. You can understand the core principles and structure of Spring MVC and grow into a more in-depth backend developer.

Spring beginners can grasp core principles and solidify basics via examples.

This book provides an in-depth study of various intermediate-level Java features necessary for practical work, using example code.

Learn practical core Java object-oriented concepts easily via example code.

Learn Java generics and collection frameworks in depth with a focus on practical applications. Also learn the basics of data structures.

This course provides an in-depth study of multithreading and concurrency, from basic principles to practical applications.

Learn the essential modern Java technologies of Lambda, Stream, and functional programming with Java, from the basics to the practical level, in depth.

Learn I/O, networking, reflection, and annotations in depth, from the basics to the practical level. Build a web application server (WAS) directly in Java.

Learn the core HTTP features essential for practical use and how to design proper HTTP APIs.

You can understand and master all the web technologies required for web application development from the basics. In Part 2 of MVC, you can learn all the utilization technologies required for practical web development on top of the core principles and structure of Part 1 of MVC.

For those who are new to JPA or who use JPA in practice but lack basic theory, By learning the basic theory of JPA solidly, even beginners can confidently use JPA in practice.

With a practical example, we will design and develop a web application using Spring Boot and JPA. Through this process, you will understand how to use Spring Boot and JPA in practice.

You will learn the core principles and advanced technologies of Spring in depth and be able to use Spring confidently.

You can understand and perfect the basics of DB data access technology required for backend development. You can understand the principles and structure of Spring DB access technology and grow into a more in-depth backend developer.

You can utilize and complete the DB data access technology required for backend development. You can understand the principles and structure of Spring DB access technology and grow into a more in-depth backend developer.

Develop APIs using Spring Boot and JPA. And learn how to optimize JPA's extreme performance.

This course will cover everything you need to know about Spring Boot for practical use.

Learn about Spring Data JPA, which provides several features to make using JPA (Java Persistence API) easier.

Solve everything from the basics of querydsl to practical use all at once!

Experience the power of Type Safe SQL with jOOQ!

This course provides an in-depth study of multithreading and concurrency, from basic principles to practical applications.

Learn I/O, networking, reflection, and annotations in depth, from the basics to the practical level. Build a web application server (WAS) directly in Java.

A practical course on easily building a super simple bulletin board with Spring Boot and React.js! This course focuses less on theory and more on hands-on practice, covering the web application development process for quick completion.

Starting with java.io, you can learn how to develop high-performance input/output systems based on NIO and NIO.2. Most importantly, the moment you master file I/O, we'll enable you to master high-performance server development as a bonus!

I have created an 'Introduction to Elasticsearch' course that is easy for non-majors to understand and can be applied immediately in practice!

We enable you to fundamentally understand and resolve issues where Hangeul appears broken on web pages or in databases, or files contain unknown characters.

Did you give up while studying Spring? Even complete beginners new to coding and non-majors can make it from JSP to Spring Boot without giving up - we'll open the path to Spring Boot for you.

Learn Springboot + iOS RestAPI Board Creation Faster Than Anyone Develop a CRUD server with Springboot and create your own board with iOS!!

This course proceeds in stages, similar to the actual work, by learning and applying the necessary knowledge while configuring the infrastructure.

A portfolio-focused course on directly deploying React frontend and SpringBoot backend to AWS cloud! This course is helpful for those who want to quickly deploy frontend and backend projects to their portfolio! You'll be able to practice step-by-step in a short period the knowledge needed for deployment, from server setup to Docker, Domain connection, Nginx, and HTTPS implementation!

AI is no longer a choice, but a matter of survival. Reduce development that took 3 days to 30 minutes, delegate repetitive tasks to AI, and focus on solving more important problems. With AI-native development methods that you can apply immediately in real work, not just theory, we'll show you the definitive way to be recognized as a "developer who's good at AI" at your company.

When you're doing backend development, at some point you face this dilemma. As services grow and traffic increases, there comes a moment when simple REST communication and CRUD structures feel limiting. I experienced the same problem in real-world work and went through many trials and errors between performance and structural complexity. The solution I chose in that process was NATS. Its simple configuration based on a single binary, ultra-low latency performance in microseconds, and the fact that it provides just the right amount of essential features for real work—from Pub/Sub to Queue Groups and JetStream—made it a very practical choice in actual service environments. This course is not about listing NATS features. Based on the problems I faced in real work, I explain with code and flow diagrams which situations led me to choose NATS, why, and how I designed the architecture. This is a course designed to help everyone—from those new to messaging systems, to backend developers preparing for jobs, to senior developers contemplating better architectures—understand distributed systems and grow to the next level.

This is a full-stack hands-on course where you clone code ChatGPT and implement it from start to finish. From Spring Boot server to React frontend | Neo + Essential This isn't just a course where you follow along with code, but guides you to build a high-quality AI chatbot service through actual service deployment.

In this course, rather than directly covering theory, you will learn how to effectively use Redis in code through hands-on practice.

# Building an 'Intelligent Collaboration' Expert Agent Team Using Spring AI Router Pattern + RAG + MCP Beyond Single Agents to Architecture: The Definitive Guide to Router Pattern and Agent Isolation Design

We develop a chat service using web socket/stomp and springboot. We also configure a simple screen using vue.js, which is a relatively easy framework. We also configure multi-server scalability design using redis pub/sub.

An AI system that grades and reviews your code in 5 seconds - imagination becomes reality. This course is an all-in-one project that builds a **'GitHub PR Automatic Analysis and Grading Bot'** using Spring AI. When a student submits an assignment (Pull Request), the server detects it and AI analyzes the code changes (Diff). The grading results are then stored in the database, feedback is automatically posted as GitHub comments, and students can check their results on a dedicated dashboard. From backend to AI integration and frontend (Vaadin) - all with Java! This is the ultimate introductory guide for all developers who want to complete their own AI service from A to Z.