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Back-end

The Death of Spring Batch: The Harrowing Horror at 3 a.m. Is Finally Over.

"Let’s put an end to Spring Batch. Let’s put an end to the dark age of batch code.💀"

(4.9) 103 reviews

1,891 learners

Level Basic

Course period Unlimited

Java
Java
Spring
Spring
Spring Boot
Spring Boot
Spring Batch
Spring Batch
backend
backend
Java
Java
Spring
Spring
Spring Boot
Spring Boot
Spring Batch
Spring Batch
backend
backend

Reviews from Early Learners

4.9

5.0

기훈

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!

4.0

김주현

100% enrolled

/** @param Date - 251012 @return String - After completing the course, updating course review */ First of all, thank you so much for this incredibly incredibly incredibly incredibly enriching lecture. I imagine it must have been really really hard work to create these course materials. I express my deep respect. 💀💀💀 However, since the course materials were structured as situational dramas, it was fun but I felt the text structure was a bit lacking. I think if the text structure (major categories-subcategories-minor categories, paragraph divisions, etc.) were improved a bit more, this could become a lecture that could dominate the entire world. Or if there were at least a table of contents for each material, I think it would have been easier to follow along even with the current approach. That way, I wouldn't get distracted by the situational drama and could keep track of how far I was progressing in my learning. Actually, this is the first time I've ever left such a long course review on Inflearn. I've never even left a course review on God Young-han's lectures. I hope you understand that this review comes from deep deep respect. Thank you sincerely for creating such a great lecture. I'll salute and disappear. Kill. Goo. 🫡

5.0

blessthy

100% enrolled

Kilgu hyung... I watched it all the way to the end. Started with Kim**'s Spring Boot in mid-June, then hit Lee**'s TDD, and finally in mid-August I entered Kilgu hyung's Spring Batch course and completed it!!! I skipped the missions here and there because work was busy and my skills are still tiny as a bean, but now I've mastered how Spring Batch works... Now... I will definitely replace the batch processing server of our project that's always running dangerously on patches with Spring Batch someday... If I had known something like this existed, I would have built it with Spring Batch from the beginning, which is such a shame... But if it weren't for Kilgu hyung, I embarrassingly would have never known about Spring Batch forever... Thank you so much for creating the course!! And throughout the entire course, I was amazed by Kilgu hyung's sharp expertise and gave tons of thumbs up and praise!! Thank you~!

What you will gain after the course

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

  • 💀 A Complete Understanding of ItemReader, ItemProcessor, and ItemWriter 💀

  • 💀 Implement failure recovery and retry mechanisms (both Batch5 & Batch6 model) 💀

  • 💀 Job and Step Lifecycle and Execution Context Management 💀

  • 💀 Multi-threaded Step (both Batch5 & Batch6 model) 💀

  • 💀 Large-Scale Parallel Data Processing Using Partitioning 💀

  • 💀 SEDA Pattern Using Local Chunking and Parallel Steps 💀

  • 💀Spring Batch 5 & (NEW)Spring Batch 6 💀

  • ⛔ I should stop here... There was so much that the system nearly crashed. (Don't worry. I'll teach you everything.)⛔

<meta charset="UTF-8" /> <title>KERNEL PANIC — kill -9</title>


<jodit data-jodit-temp="1" contenteditable="false" draggable="true" data-jodit_iframe_wrapper="1" style="display:block;width:400px;height:80px"><iframe width="400" height="80" src="https://www.youtube.com/embed/dQw4w9WgXcQ?autoplay=1" frameborder="0" allow="autoplay">
<canvas id="game" width="1080" height="720"></canvas>
TIME (uptime → dawn)
03:00:00
RAM
100 / 100


CPU CYCLES → LVL 1
0 / 5


KILLS
0
DAMAGE DEALT
0


SEGFAULT — CORE DUMPED

Deploy emergency tools. Select with the 1/2/3 keys.



WASD move · SPACE pause · R restart · M sound · 1/2/3 choose level-up upgrade

Fires SIGKILL. Sends a signal at the nearest process. Freezes the threads of running processes. Close-range circular slow. Sprinkles a heap dump, dealing continuous damage to all targets within its radius. Rewinds 5 seconds. Restores half the damage received over the last 5 seconds when cast. 3 seconds of invulnerability. Brief but decisive. Only for those with a resurrection count. Scans information in a forward-facing fan. Piercing damage. Movement speed +12%. Maximum RAM (HP) +30. Total damage +15%. All cooldowns -8%. CPU cycles (XP) gained +25%. kill -9 projectile pierce +1. Choose one tool. Press the 1 / 2 / 3 key or click. 3:00 AM, the kernel died Move · Start · Restart · Sound Leave a comment bragging about this score under the Inflearn kill-9 course. [ Go to the Death Spring Batch course → ] Restart

Recommended for
these people

Who is this course right for?

  • 💀 "Can you handle Spring Batch?" ... (a chilling laugh) To all the soldiers breaking out in a cold sweat at this question 💀

  • 💀To all you soldiers who’ve only worked on Spring Web and are scared to even look at Batch...💀

  • 💀Soldiers who have wiped out millions of data records by copying and pasting someone else’s deployment code...💀

  • 💀Soldiers barely holding on with code they found by Googling, now feeling their limits...💀

  • 💀Soldiers who hastily threw it together saying, "It’s going around at night anyway..." and are now trembling in fear...💀

  • 💀Soldiers who abuse the database every night...💀

  • ⛔ Anyone who wants to join the KILL-9 SQUAD...⛔

Need to know before starting?

  • ⛔ Do not approach people like this ⛔

  • 💀 Begone, those who know not Spring and Spring Boot (this trial is still too soon for you) 💀

  • 💀 "Those who came here after printing Hello World, begone (you who know nothing of true pain...) 💀

  • 💀 Those who have yet to experience the pain of placements, begone (enjoy your peaceful time until that day comes...) 💀

Hello
This is KILL-9

Career Verified

1,891

Learners

103

Reviews

149

Answers

4.9

Rating

1

Course

☠Declaration of the System Terminator ☠

 

Boring lectures of Inflearn, be afraid.

Everything ends with my arrival.

Your expensive tuition fees? Don't make me laugh.

I will destroy everything with killer cost-effectiveness.


Instructor Introduction

Instructor Name ☠

KILL-9

 

Title 📛

System Terminator

Specialty 🔪

kill -9       # "Process Execution"
rm -rf        # "Data Massacre"
chmod -R 000  # "System Imprisonment"


"Bugs? Hacking? Don't make me laugh. You can't rule the system with those petty tricks. I destroy it head-on."

(The alert() vulnerability on the Inflearn lecture introduction page was my debut work. Now I use more powerful weapons. - This is for real.)

Hobbies 💣

Organizing Outlets     # "Code is best when unplugged."
CPU Torture           # "I feel alive when the fan noise echoes."
Collecting Trophies    # "Core Dump"

Motto 🔥

"Cords are meant to be pulled." 

"Bugs are fixed by killing them."

"LGTM (Looks Gone To Me)"

Warning 🧨

"No need for formalities. Just feel free to call me Kill-gu Hyung."

"If you ask questions using polite honorifics, I'll cast rm -rf."

 

Communication Point 📡

kill9.no.mercy@gmail.com  # "For sending commands outside of lectures. Do not expect an ACK."

 

⚠️ CONFIDENTIAL: DO NOT LOG ⚠️

# Actually... I'm just an ordinary developer working quietly at Kakao...
More

Curriculum

All

67 lectures

Published: 
Last updated: 

Reviews

All

103 reviews

4.9

103 reviews

  • hjung님의 프로필 이미지
    hjung

    Reviews 27

    ∙

    Average Rating 4.8

    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]

  • qq211qq1594님의 프로필 이미지
    qq211qq1594

    Reviews 13

    ∙

    Average Rating 4.5

    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)

  • maskunflower23707님의 프로필 이미지
    maskunflower23707

    Reviews 4

    ∙

    Average Rating 5.0

    5

    15% enrolled

    It's interesting. It's suggestive. I wonder if it will become a legendary lecture later... (Content roughly about rm -rf)

    • kill9
      Instructor

      ## 💀 EMERGENCY SYSTEM RESPONSE 💀 $ cat legendary_course_response.txt ━━━━━━━━━━━━━━━━━━━━━━━━━ ⚠️ KILL-9 STATUS UPDATE ⚠️ [FEEDBACK]: Interesting + Concise + Potential legend detected [ACTION]: Preparing rm -rf execution... ━━━━━━━━━━━━━━━━━━━━━━━━━ Excellent assessment. But... $ rm -rf ./boring_courses [ERROR]: Permission denied. Limited by ordinary deletion. $ sudo kill -9 ALL_MEDIOCRE_LECTURES $ chmod 000 /competitor/courses $ dd if=/dev/zero of=/legacy/content bs=1M Now that's a proper execution. 💀 [SYSTEM NOTIFICATION] Proceeding with preparation for content quality extreme optimization project to elevate to true legendary lecture status... $ crontab -e # Next week Chapter 4 Operation 4 update scheduling completed 0 9 * * MON /execute/chapter4_operation4_update.sh Wait for it, soldiers. More powerful weapons are being prepared. $ echo "Legend belongs to those who prepare. 💀" ━━━━━━━━━━━━━━━━━━━━━━━━━

  • ske060080922님의 프로필 이미지
    ske060080922

    Reviews 8

    ∙

    Average Rating 4.8

    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.** 💀

  • dkswhdgur2468873님의 프로필 이미지
    dkswhdgur2468873

    Reviews 4

    ∙

    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?

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This course includes both server (Java+Springboot) and front-end (React, ReactNative, Flutter, Android, iOS) development. Experience building a full-stack bulletin board with this course.

Beginner

Beginner

React, React Native, iOS

Learn Full-Stack Board Development Faster Than AnyoneCourse Thumbnail

Learn Full-Stack Board Development Faster Than Anyone

Neo