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Spring Batch of Death: The brutal horror of 3 AM is now over.

Let's terminate Spring Batch. We conclude the dark ages of batch code.💀

(4.9) 42 reviews

563 learners

  • KILL-9
스프링
텍스트 강의
Java
Spring
Spring Boot
Spring Batch
backend

Reviews from Early Learners

What you will learn!

  • 💀 Spring Batch's Chunk-Oriented Processing Model and Tasklet-Oriented Processing 💀

  • 💀 Perfect Understanding of ItemReader, ItemProcessor, ItemWriter 💀

  • 💀 Job and Step Lifecycle and Execution Context Management 💀

  • 💀 Large-scale Data Parallel Processing Using Partitioning 💀

  • 💀 Failure Recovery and Retry Mechanism Implementation 💀

  • 💀Spring Batch 5

  • ⛔ I'll stop here... It was too much; the system nearly crashed. (Don't worry. I'll tell you everything.)⛔

KILL-9: "Warning: Reading this document without the audio sequence reduces learning efficiency by 66%."

🚨 Warning: Critical Risk Detected 🚨

💀 Face reality 💀

🔥 What have you been doing all this time?🔥

⚠ Spring Batch Execution Protocol Activated ⚠


"For all developers suffering from batch processing

The system executioner has stepped forward personally

The desperate horror of 3 AM is now over.💀"


Arm yourself with the most up-to-date and most accurate Spring Batch course.💀


⛔ The Weapons You Will Obtain ⛔

Through this course, you will be equipped with the following deadly weapons,

You will gain the power to control the system.

💀 Tasklet vs Chunk Processing: Core Operations of Batch Systems

Did you think the batch code execution flow was a hidden black box? How ridiculous.

Two representative processing models of Spring Batch. We dissect the concepts and internal operating principles of tasklet-oriented processing and chunk-oriented processing.

From simple file organization and one-time tasks like table TRUNCATE to chunk-oriented processing that reads, processes, and destructively writes millions of data records.

I will completely dissect the internal operating principles of both methods to help you intuitively judge which weapon to use in which situation for optimal results.


💀 Data Execution Methods: ItemReader and ItemWriter

Don't suffer from large-scale data processing anymore.

Whether it's a file system, RDBMS, or NoSQL, it extracts data without discrimination (ItemReader) and injects it as desired (ItemWriter).

FlatFileItemReader, JsonItemReader,

JdbcCursorItemReader, JpaPagingItemReader

...

Dig into the internal operating principles of each implementation and master how to efficiently process large-scale data.

Paging? Cursor? What is appropriate when? Your ignorance has now come to an end.

💀 Job and Step Control: Master the Heart of the Batch System

Deep dive into the internal workings and lifecycle of Job and Step.

It helps develop the ability to clearly understand why a batch failed and where it should restart (Restartability) by tracking the relationships between JobInstance, JobExecution, and StepExecution and their status changes (BatchStatus, ExitStatus).

Look inside JobRepository and directly control metadata to transparently manage the batch execution flow that was once like a black box. No longer be flustered by unexpected failures. Everything is under our control.

💀Spring Batch Extension Features

Too much data to process? Execution time too long? Don't worry.

When basic weapons aren't enough, special equipment is prepared to make deployment performance explode.

  • Multi-threading (Multi-threaded Step) to parallelize tasks within a single Step,

  • Data that cannot be handled is broken down into smaller pieces through partitioning (Partitioning) and distributed across multiple workers for processing.


Armed with this knowledge, your deployments will no longer bow down to performance issues.

You can use it with confidence as I have clearly organized the real thread safety of Spring Batch more than anything else.

Now it's time for the batch system to fear you.💀


💀 Spring Batch Additional Survival Skills

  • A strategy to confine and control failures with Skip/Retry policies.


  • Complete mastery of state management and batch job stop/restart mechanisms using ItemStream.


  • How to design complex workflow using Spring Batch Flow.

  • How to Monitor Every Moment of Batch Processing with Various Listeners

It will take time to master all weapons perfectly.

But don't worry.

My battle experience gained through blood and sweat will accelerate your growth. 💀

💀There is no paradise where you run away to💀

💀To put an end to this damn chaos. I stepped forward.💀

💀 Price Execution Declaration 💀

Final Warning: It's Time to Choose

[EXECUTE: SYSTEM UPGRADE SEQUENCE]

# --- Preparing system for upgrade ---

# Removing fear module... Done.
$ rm -rf ./fear_of_batch_errors           
# Preparing skill directory... OK.
$ mkdir -p /opt/advanced_batch_skills     
# Granting full access to tech stack... Permissions updated.
$ sudo chmod 777 /opt/advanced_batch_skills                  
# Injecting KILL-9 grade expertise... Root privileges acquired. Processing...
$ sudo ./install-spring-batch-expertise   
[▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100% Installation Complete. 
System Reboot Recommended for optimal performance.

FATAL WARNING

$ cat warning.txt

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
⚠️  WARNING  ⚠️
[FATAL ERROR] Access Restriction Detected
[PROCESS ID]: #KILL-9_WARNING_PROTOCOL
[STATUS]: Critical
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Those who are tempted by the intense concept and attempt to access this course out of mere curiosity should leave immediately.
This course shows no mercy to light curiosity that attempts access without sudo privileges.


I only want those who truly wish to walk the path of the 'System Dominator'.
I warn you clearly. Only those prepared to endure to the end of this suffering should take this course.


Your time is precious. Do not waste it.
Only those with the genuine will to learn can bear the weight of this code.
Only those who faithfully follow through to the end of the course will become true masters of Spring Batch.


[ADDITIONAL NOTE]
Even those who already have Spring Batch experience are welcome if "the will to follow diligently" is detected.
$ ls -la /home/user/ | grep determination
You will surely gain much.


# The choice is yours. But I will execute the consequences.💀

$ sudo sound-off --tactical-report --system-status=spring-batch --volume=maximum --force

System Access Pre-Check Checklist

Practice Environment

MAC based (JDK 17) environment. (Windows? Ugh... A Spring Batch server on Windows? Windows will only bring you pain.)

This is a JAVA 17, Spring Boot 3.4, Spring Batch 5.2 environment.

(Sigh...💀 Spring Batch 5.2 has already been released. When will I have to modify the course content again... Batch is eternal, but my time is finite.)

Learning Materials

"The age of video is over. Now it's the age of text again. 💀"


This is a text-format lecture. Curious about the reason? I've made the early part of the lecture available for free

' System Terminator's Learning Principles ' Read this.

Here, you will encounter my philosophy for true learning, not mere knowledge transfer.

Recommended for
these people

Who is this course right for?

  • 💀 "Can you handle Spring Batch?" ... (cold laughter) O, you who break out in a cold sweat at this question 💀

  • 💀O ye who only delve into Spring Web and fear even looking at Batch...💀

  • 💀Those who've lost millions of data from copy-pasting others' batch code...💀

  • 💀You who barely got by with Googled code, now feeling your limits...💀

  • 💀"It's just running at night anyway..." and then roughly put it together, oh ye who tremble in fear...💀

  • 💀You who torment the database every night...💀

Need to know before starting?

  • ⛔ Such people, stay away ⛔

  • 💀 Those ignorant of Spring and Spring Boot, away (This trial is still early for you) 💀

  • 💀 "Hello World" only? Begone! (You know not true suffering...) 💀

  • 💀 Those yet to feel deployment's agony, begone (Until that day, enjoy your peace...) 💀

Hello
This is

563

Learners

42

Reviews

58

Answers

4.9

Rating

1

Course

시스템 종결자의 선언

 

인프런의 지루한 강의들이여, 두려워하라.

나의 등장으로 이 모든 것이 끝난다.

너희의 비싼 강의료? 웃기지 마라.

살인적인 가성비로 모든 것을 파괴하겠다.


강사 소개

강사명

KILL-9

 

칭호 📛

시스템 종결자

특기 🔪

kill -9       # "프로세스 처형"
rm -rf        # "데이터 학살"
chmod -R 000  # "시스템 감금"


" 버그? 해킹? 웃기지마. 그딴 잔머리로는 시스템을 지배할 수 없다. 난 정면으로 파괴한다. "

(인프런 강의 소개 페이지 alert() 취약점은 내 처녀작이었지. 이제는 더 강력한 무기를 쓴다. - 진짜임)

취미 💣

콘센트 정리     # "코드는 뽑아야 제맛."
CPU 고문       # "팬 소리가 울려 퍼질 때, 나는 살아있음을 느낀다."
전리품 수집     # "코어 덤프"

좌우명 🔥

"선은 뽑으라고 있는 것이다" 

"버그는 죽여서 고치는 것이다"

"LGTM (Looks Gone To Me)"

경고 🧨

"격식 따위 필요없다. 그냥 편하게 킬구형이라 불러라."

"존댓말로 질문하면 rm -rf 시전한다."

 

통신 접점 📡

kill9.no.mercy@gmail.com  # "강의 외의 명령 전송용. ACK는 기대하지 마라."

 

⚠️ CONFIDENTIAL: DO NOT LOG ⚠️

# 사실... 카카오에서 조용히 일하는 평범한 개발자에요...

Curriculum

All

38 lectures

Course Materials:

Published: 
Last updated: 

Reviews

All

42 reviews

4.9

42 reviews

  • qq211qq1594님의 프로필 이미지
    qq211qq1594

    Reviews 9

    Average Rating 4.6

    5

    32% enrolled

    Death's Spring Batch course, this is truly the path of a real system executioner...☠️ If you thought Spring Batch was just another ordinary batch framework, you're gravely mistaken. kill-9's course doesn't give you theory—it gives you real weapons to survive in the bloody battlefield of actual combat. Flat files? Fixed-length? Complex log files? Instead of just saying "figure it out yourself," he explains everything sharp as a blade so you can actually use it in real work situations. Even when choosing a single delimiter, you'll understand "why it has to be done this way." Code, explanations, practice, execution commands... the entire course is filled with the mindset of "this is real combat." You're not just learning—you feel like you're becoming a 'batch terminator.' And the more you listen, the more confidence builds that someday you too will be able to leave a mark on systems with a single line of open source code. Batch prepared for death—are you still hesitating? The moment you take this course, you too become a true member of the 'kill-9 squad.' ☠️🔥

    • kill9
      Instructor

      💀 System Terminator KILL-9 Course Review Confirmation Complete 💀 Such a killer course review... My system almost froze for a moment. **"kill-9 squad"** This expression is too powerful. My kernel shook. So? I adopted it immediately. From now on, we are the "kill-9 squad." From now on, you're not just developers. We are the system terminator squad. rm -rf mediocrity kill -9 boredom Welcome to the kill-9 squad, member. Squad member certification takes place on the battlefield within the course. We're not just some developers, we're the system terminator squad. Welcome to the kill-9 squad, member. - KILL-9 (Welcoming new squad members)

  • dkswhdgur2468873님의 프로필 이미지
    dkswhdgur2468873

    Reviews 2

    Average Rating 5.0

    5

    24% enrolled

    Text-based lectures.. I love being able to dissect, savor, and enjoy them at my own pace. Just as intended by the lecture format, I love not having to pause unnecessarily or use the rewind button. I just hope you'll provide more lectures💀☠️

    • kill9
      Instructor

      💀 Welcome, I've finally met a true hacker 💀 Yes, this is it. Text is the best interface. - Mouse clicking? Waste of time - Video buffering? CPU abuse True masters use Command + F as a weapon. Like grep, extract only the information you want immediately. Text scrolling speed = Your learning speed However, there's an important warning: Never skip chapters 4 and 5. Many students miss the core of 스프링 배치 by skipping this part. If you thoroughly digest these two chapters, you'll reach a distinctly different level. Are you ready to deep dive?

  • javarunner님의 프로필 이미지
    javarunner

    Reviews 68

    Average Rating 5.0

    5

    21% enrolled

    • kill9
      Instructor

      Thanks, javarunner bro 💀

  • hjung님의 프로필 이미지
    hjung

    Reviews 21

    Average Rating 4.7

    5

    50% enrolled

    Bro, keep the updates coming when versions upgrade! I'm counting on you, okay?!

    • kill9
      Instructor

      💀 [SYSTEM ACKNOWLEDGMENT] 💀 [INCOMING TRANSMISSION FROM BATTLEFIELD] =============================================== [KILL-9 RESPONSE PROTOCOL ACTIVATED] Yeah Jeonghun hyung 💀 [COMMITMENT PROTOCOL ENGAGED] The system continuously evolves. Every time there's a version update, the lectures will be upgraded together. 💀 [UPGRADE GUARANTEE]

  • ske060080922님의 프로필 이미지
    ske060080922

    Reviews 5

    Average Rating 5.0

    5

    62% enrolled

    Kilgu-hyung! I'd planned to leave a review after finishing the course, but I got so emotional watching the lectures that I'm writing it now. As Kilgu-hyung said early in the lecture, studying with text is truly difficult, but it definitely seems to stick in your mind more. Thanks to Kilgu-hyung's writing, it's great to learn so enjoyably and without difficulty. Thank you for such an incredibly cost-effective lecture, and I look forward to your future courses!

    • kill9
      Instructor

      ██████████████████████████████████ █ ╔═════════════════════════════╗ █ █ ║ 💀 KILL-9 TACTICAL RESPONSE TERMINAL 💀 ║ █ █ ║ [ STUDENT REVIEW RECEIVED ] ║ █ █╚═════════════════════════════╝ █ █████████████████████████████████ Crackle... Student review data received... Emotional circuit activated... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ You were overwhelmed with emotion?.. I'm the one who's overwhelmed with emotion.. I can't help but shed tears after seeing this review. 💀 Yes, it will be etched into your brain as much as it was painful. But remember. Gi-hoon hyung.. You will soon forget it. That doesn't mean it's useless. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ [KILL-9 MEMORY STRATEGY] "Huh? Where did I learn this?" "Oh, I think I've seen this somewhere before?" "Oh, I knew this before?" Maximizing these **'Oh, where is this from?' moments** is my and our course's core strategy and goal. Even with just this illusion, the lecture is definitely valuable enough. Because this is also **a type of secondary index**. 💀 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Complete Recall < Partial Recall + Index >> Complete Oblivion Warrior, a KILL-9 index has been built in your brain. 💀 █████████████████████████████ [ WARRIOR ADVANCEMENT REPORT ] You've completed up to Chapter 4's final operation... Many soldiers actually give up at this point or don't even attempt to learn at all, but You've worked hard, warrior. If you've broken through Chapter 4's final operation, you'll be able to sufficiently follow Chapter 5. I assure you that after breaking through Chapter 5, you will **know Spring deployment better than anyone else**. And Chapter 6... I guarantee it. The difference in understanding between **those who have thoroughly learned Chapter 4's final operation and Chapter 5 and moved on to Chapter 6** and those who haven't is completely different. Beyond simply memorizing a list of knowledge, it will be a different level because **the operational principles will be understood as if piecing together a puzzle**. ━━━━━━━━━━━━━━━━━━━━━━━━━ **Hyung, you can do it. And (though it's too obvious to pursue) thank you for the valuable review.** 💀

$23.10

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