[Lv2] JPA Mastery for Working Developers - From Persistence Context to Practical Patterns

Name: [Lv2] JPA Mastery for Working Developers - From Persistence Context to Practical Patterns
Price: 99000 KRW

You've probably written SQL using JdbcTemplate before, right? Everyone has likely had that experience of sighing while having to fix both the SQL and the RowMapper every time a single column changes. This course starts from that very pain. Doing a single SELECT with pure JDBC takes 35 lines. You open a Connection, create a PreparedStatement, iterate through the ResultSet, and if you miss a single close(), the server crashes. After typing through this hell yourself, when you finally encounter a single line of JPA's save(), you'll feel "this is why we use JPA" not just in your head, but in your hands.

85 learners are taking this course

Level Basic

Course period Unlimited

dingcodingco

JPA

spring-jpa

Java

Spring

Spring Boot

JPA

spring-jpa

Java

Spring

Spring Boot

What you will gain after the course

The ability to fluently explain first-level cache, dirty checking, and transactional write-behind based on hands-on experience.
The experience of realizing why JPA is necessary after personally suffering through 35 lines of JDBC code.
Practical debugging skills to identify the cause of N+1 problems by analyzing logs and selecting the appropriate solution among Fetch Join, @EntityGraph, or @BatchSize based on the situation.
The ability to design clean dynamic queries without "if-statement spaghetti" using QueryDSL's BooleanExpression, and to integrate JPA and QueryDSL into a production-standard structure using the Custom Repository pattern.
From entity design to inheritance relationship mapping, BaseEntity (Auditing), and embedded types — the design intuition to decide "Let's go with this pattern" rather than asking "How should I design the table?" when starting a real-world project.

If you learn JPA like this, you will fail your interview

I created an API with Spring Boot in Lv.1.

Writing SQL with JdbcTemplate and mapping results with RowMapper... Oh, the CRUD is working!

But looking at the code, these thoughts come to mind.

"Why do I have to write SQL as strings inside Java code?"

"I have to fix all the SQL and RowMapper every time a single column is added..."

"What happens when there are 10 tables?"

And they ask like this in the interview.

"Is there any other way to save to the DB besides JdbcTemplate?"

"Um... I've heard there's something called JPA... but honestly, I haven't used it..."

You will fail.

"What is JPA's persistence context?"

"... Pardon?"

I have experience writing SQL manually, but I don't know the technology to solve that pain.

Most JPA courses only teach "how to use it".

"JPA is an ORM. You just need to add @Entity and use save()."

It works if you follow along. But interviewers will ask "why."

"Why do you use JPA?"

"Please explain the operating principles of the persistence context."

"How did you solve the N+1 problem?"

People who have only learned the "How" answer like this.

"JPA is... an ORM... and if you use save(), it gets saved..."

That's it. There's nothing more to say.

It's because they've never tried it without JPA. Since they've never written 35 lines of JDBC code, they don't know why JPA is necessary.

That's why this lecture gives you "pain" first.

To learn JPA properly, you shouldn't learn save() first. You have to experience the pain of 35 lines of JDBC code first.

Doing a single SELECT with pure JDBC takes 35 lines. Opening the Connection, creating the PreparedStatement, iterating through the ResultSet, and if you don't call close(), the server crashes... You have to type all of this out yourself.

After experiencing this pain, how does it feel to see a single line of JPA's save()? It's thrilling.

At this moment, it goes like this: "Ah... so this is why we use JPA. This is why the persistence context is necessary."

N+1 is the same. After experiencing the hell of 11 queries being executed when you only searched for 10 members, seeing it reduced to a single query with just one line of Fetch Join will carve that principle into your bones.

This "pain → salvation" experience makes you a "developer who can explain."

Five weeks later, you will be able to say this at an interview.

❌ (Typical Answer) "I use JPA because it is an ORM technology and it is convenient."

⭕ (Experience-based answer) "I've personally developed using JDBC, and while the repetitive task of writing SQL every time was an issue, what was most difficult was the mismatch that occurs when saving object-oriented code to the DB. However, I found that JPA's persistence context solves this problem through the first-level cache and dirty checking."

If you answer like this, the interviewer will be able to feel, 'Ah, this person has actually experienced this firsthand.'

🧠 Core JPA Concepts Understood Through Analogies

Understanding Persistence Context as a Secretary - A secretary who caches lookups, detects changes, and sends queries in batches.
Understanding Write-Behind with Bulk Shipping — Sending items one by one is inefficient; call a truck to deliver them all at once
Understanding Lazy Loading through Fake Employees (Proxies) — A fake object that just waits until there is actual work to do
Understanding dynamic queries through Lego assembly — QueryDSL, where conditions are fitted together one by one

✨ Features of this course

📌 Constantly asking "Why?"

This course does not end with "do it this way."

Typical lecture: "The persistence context manages entities. You just need to use save()." (X)

This lecture: Experience the 35-line hell of SELECT with pure JDBC firsthand, then deeply feel why the persistence context's first-level cache is a revolution.

Every concept starts with "Why was this technology created?" Once you internalize the "Why," the "How" follows naturally.

📌 "Pain → Salvation" Learning Method

This is not a lecture that simply gives you the answers. It makes you experience the pain first, so you can truly feel the greatness of the solution.

Week 1: 35 lines of JDBC SELECT hell → JPA's persistence context finishes it in 3 lines

Week 2: Data corruption disaster due to missing EnumType → EnumType.STRING defense / null overwrite disaster with merge() → Safe modification based on dirty checking

Week 3: Confusion from paradigm mismatch between objects and tables → Cleanly resolved with association mapping / Query explosion due to N+1 → Resolved with a single line of Fetch Join

Week 4: Copy-paste hell for createdAt in every entity → Solved at once with BaseEntity / The disaster of deleting all value type collections → Entity promotion pattern

Week 5: String JPQL typos leading to runtime failures → QueryDSL compile-time validation / Spaghetti code from if-statement dynamic queries → BooleanExpression Lego-like assembly

This experience will enable you to start your interview answers with, "I have actually experienced this myself..."

You will be able to explain the internal workings, from JPA's persistence context to QueryDSL.

📌 Answering techniques that prompt follow-up questions from interviewers

Lectures that just throw concepts at you and end there, lectures where you have no idea how to actually use the material in an interview… I hated those kinds of lectures the most.

This course connects concepts → experience → interview answers.
(The image below shows the interview success content from the Backend Resume Differentiation Course)

🗺️ This course is Lv.2

This course is a core stage of the roadmap. If you have built a foundation in Spring Boot at Lv.1, it is now time to master JPA, which is most widely used in practice.

Lv.0 Core Database Concepts - Building a Foundation Before Starting Spring

Lv.1 Introduction to Spring Boot - Building APIs with Spring and Interview Preparation

👉 Lv.2 Professional Developer's Complete Mastery of JPA (This Course) - From Persistence Context to QueryDSL

Lv.3 Deployment (AWS, CI/CD) - Releasing to the real world, not just localhost

Lv.5~6 Architecture & Practical Projects - Building MSA, DDD, and E-commerce Systems

Equip yourself with practical weapons in this course, and let's move forward together step by step!

Let's start with this course and move forward together step by step!

I will provide the textbook to those who write a course review!

Get it after verifying your course review in the community!

(I have included the instructions on how to verify in the very last lecture __)

🎁 EVENT 2 🎁

If you submit the Google Form through this link,

🎟 We will send you a 15% discount coupon 🎟

🎁 EVENT 3 🎁

Providing a 3-month free trial for IntelliJ IDE!

To support your development studies, I have prepared special benefits through a collaboration with JetBrains.
You can use IntelliJ for free for 3 months using the promotion code below!

✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefit Details: JetBrains Single IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.) 3-month free trial
✅ Expiration Date: ~ Until May 13, 2026
✅ How to Use😀

1. Access the official JetBrains coupon registration page

2. Enter the code and select the IDE you want

3. Check the license issued via email

⚠ Precautions:
This code can only be used by new users who are using JetBrains for the first time.
(Only those with no prior history of using a paid JetBrains license can register)
(You can do this indefinitely by creating a new Google email account)

Recommended for
these people

Who is this course right for?

Those who want to get a feel for what JPA is and why it should be used.
Those who want to induce follow-up questions from interviewers with experience-based answers
For those who understand @ManyToOne but are confused about why bidirectional relationships are necessary and what mappedBy actually is.
Those who want to understand the principles of when queries are executed, how change detection works, and why there is no need to use update().
Those who need the practical ability to read query logs and resolve issues directly.

Need to know before starting?

Java Basic Syntax (if statements, for statements, classes, interfaces)
Experience building a simple REST API with Spring Boot
Experience performing DB CRUD using JdbcTemplate (basics such as SQL SELECT, INSERT, etc.)

Hello
This is dingcodingco

17,192

Learners

1,720

Reviews

330

Answers

4.9

Rating

Courses

🚀 Ex-Toss, POSTECH graduate | Current Backend Developer (+8 years)
🎥 YouTuber with 20,000 subscribers | Development content creator
📚 Inflearn Instructor | Cumulative 15,000+ students
👥 Running a developer career community (8,000+ members)
🧩 Contributor to various open source projects (Gradle, Spring AI, etc.)
📝 Passed 38 resume screenings and conducted 100+ resume reviews on Kmong (5.0 rating)

I deliver vivid, real-world industry insights in an easy-to-understand and deductive manner.

Inflearn Interview Link!

Curriculum

All

41 lectures ∙ (9hr 39min)

Section 1. [Week 1] From the Pain of JDBC to the Salvation of Persistence Context

9 lectures ∙ (2hr 21min)

Section 2. [Week 2] From EntityManager to JpaRepository

6 lectures ∙ (1hr 49min)

10. 2-1. 🏷️ Entity Mapping Basics: Complete Understanding of @Entity, @Table, and @Column
20:56
11. 2-2. 🔑 Primary Key Mapping: "ID, I'll put it in vs. You put it in"
28:55
12. 2-3. 🚽 Flush: Synchronizing the persistence context at the "moment the water goes down"
16:25
13. 2-4. 👻 Detached State: "What happens when the secretary goes home"
12:31
14. 2-5. 🎁 Introduction to Spring Data JPA: Just create the interface, and Spring handles the implementation
15:42
15. 2-6. 📦 Deep Dive into Spring Data JPA save(): The Pitfalls of Identifiers and Merging
15:04

Section 3. [Week 3] Harmony between Objects and Tables: Association Mapping and Lifecycle Control

9 lectures ∙ (2hr 11min)

16. 3-1. 🌍 Object World vs. Table World: The Fundamental Difference Between References and Foreign Keys
13:07
17. 3-2. ➡️ Unidirectional Association: The first mapping starting with @ManyToOne
10:04
18. 3-3. ↔️ Bidirectional Mapping and the Rules of Ownership (feat. Convenience Methods)
20:11
19. 3-4. 📚 Various Relationships: One-to-Many, One-to-One, Many-to-Many (Reasons why you shouldn't use it)
17:11
20. 3-5. ⚡ Eager Loading vs. Lazy Loading: Why should LAZY be the default?
07:53
21. 3-6. 🎭 Proxy: A "Fake Object" that enables lazy loading
16:22
22. 3-7. 😴 Internal Workings of Lazy Loading: The Moment a Proxy is Replaced by the Real Object
27:51
23. 3-8. 👨‍👦 Cascade (CASCADE): "If Mom goes, I go too"
10:30
24. 3-9. 🗑️ Orphan Removal: "A child who loses their parent is deleted"
08:10

Section 4. [Week 4] Advanced Mapping and Object-Oriented Modeling: Mastering Inheritance, Value Types, and Composite Keys

8 lectures ∙ (1hr 29min)

Section 5. [Week 5] Mastering Dynamic Queries and Performance Optimization with QueryDSL, the Highlight of Practical Work

9 lectures ∙ (1hr 47min)

Published: 03/23/2026

Last updated: 04/20/2026

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[Lv2] JPA Mastery for Working Developers - From Persistence Context to Practical Patterns

What you will gain after the course

If you learn JPA like this, you will fail your interview

Most JPA courses only teach "how to use it".

That's why this lecture gives you "pain" first.

✅ Here is what you will learn.

🧠 Core JPA Concepts Understood Through Analogies

🌱 The next step for those who have completed Lv.1

✨ Features of this course

📌 Constantly asking "Why?"

📌 "Pain → Salvation" Learning Method

📌 Answering techniques that prompt follow-up questions from interviewers

Recommended for these people

🗺️ This course is Lv.2

🎁 EVENT 🎁

I will provide the textbook to those who write a course review!

🎁 EVENT 2 🎁

🎁 EVENT 3 🎁

The person who created this course

Points to note before taking the course

Practice Environment

Learning Materials

Prerequisites and Notices

Recommended for
these people

Hello
This is dingcodingco

Curriculum

Reviews

dingcodingco's other courses

Similar courses

[Lv2] JPA Mastery for Working Developers - From Persistence Context to Practical Patterns

What you will gain after the course

If you learn JPA like this, you will fail your interview

Most JPA courses only teach "how to use it".

That's why this lecture gives you "pain" first.

✅ Here is what you will learn.

🧠 Core JPA Concepts Understood Through Analogies

🌱 The next step for those who have completed Lv.1

✨ Features of this course

📌 Constantly asking "Why?"

📌 "Pain → Salvation" Learning Method

📌 Answering techniques that prompt follow-up questions from interviewers

Recommended for these people

🗺️ This course is Lv.2

🎁 EVENT 🎁

I will provide the textbook to those who write a course review!

🎁 EVENT 2 🎁

🎁 EVENT 3 🎁

The person who created this course

Points to note before taking the course

Practice Environment

Learning Materials

Prerequisites and Notices

Recommended for these people

HelloThis is dingcodingco

Curriculum

Reviews

dingcodingco's other courses

Similar courses

Recommended for
these people

Hello
This is dingcodingco