JVM ( java virtual machine) architecture - tutorial

In this video I tried to explore one of the popular core Java interview topics - Java virtual machine architecture - this provides you a fairly detailed walk through, also touches up on topics such as permgen and metaspace( jdk8) - I am going to post more topics like these, hit subscribe if you like what you see.
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[@devsatg]

Man, I have already watched this video like 5 times and I keep coming back to refresh. Kudos

[@shabinjose]

Same here👍

[@vyshnavramesh9305]

0:49 Edit .java -> compile .java -> run .class 3:33 JVM breakdown 4:14 Class loader: load (bootstrap (rt.jar), extension (jre/lib/ext), application (classes we write)) 6:59 Class loader: link (verify bytecode, prepare memory allocation for static variables, resolve nested references of a class) 10:02 Class loader: initialize (of static variables, static blocks) 11:09 ClassNotFoundException and ClassDefNotFoundException 12:38 Runtime Data area 13:01 Method Area / Permgen space / Metaspace (class data like static variables) 16:16 Heap (object data) 17:41 Program Counter Register: pointer to next instruction to be executed per thread 18:35 Java Stacks: stack frame of currently running method per thread 20:16 Native method stack: for running non-java methods called from java methods running in Java Stack (per thread) 24:09 Execution engine: GHIJ (Garbage Collector, Hotspot Profiler, Interpreter, JOT Compiler) 24:26 Interprets and executes the bytecode/instruction 25:52 JIT Compiler: Bytecodes that are repeated, called hotspots, are saved from re-interpretation. On the fly compiles them and make them ready for execution 26:27: Hotspot Profiler: graphically analyses the all the bytecodes and helps JIT compiler 27:36 Recap 26:57 Garbage Collector: cleans up unused classes, objects and memory areas.

[@baobozo]

Great tutorial man~ Best thing I've ever found to have JVM explained so clearly in such a simple way.

[@jvsnyc]

This is still great after 5+ years. The Bootstrap loading is somewhat different in the most recent versions of Java, they broke up rt.jar into modules which aren't covered here because they didn't exist back in Java 8...

[@hp354]

Sir, Thank you for sharing your deep insight on this subject. After several years of struggling through understanding JVM concepts, this video today has finally helped me!!!

[@tatyanav8326]

despite slightly outdated it's one of the best videos I've went through, perfect to start with

[@isaaczhu9223]

An excellent, detailed, on-point overview of the JVM. Great work!

[@swapnilpuri]

Very well explained. Thanks for creating and sharing the Video.

[@ganesh2182]

Excellent presention Mr. Ramachandran.. Exactly what i was looking for. Thanks again n again.!

[@smuralimohan1]

Excellent video... never seen a better one on JVM. Thanks a lot!

[@multiVitamin125g]

Fully agree!

[@salonimahajan1213]

kzbin.info/www/bejne/ina9mqOAfL2anaM You can also watch this

[@harishkumardayalan]

One amazing tutorial and very well explained. Thank You!

[@balajikalavakollu4134]

Very simple, nice and easily understandable... thanks for sharing.

[@lythd]

Wow this is perfect, thank you so much for this I am definitely subscribing, such quality. I can't wait to binge watch all your videos!

[@mail2mahendran]

Awesome presentation with all the images. Thanks and awaiting more of your videos.

[@akshatvashishtha4626]

Hi Ranjith this the most absolute extent about internal working of JVM.. Your work is reverence.. Such a deep & cultured explanation on JVM.. Generally, I never write on anything but your video convinced me to share my thoughts.. Great work, it's too helpful..

[@skaterope]

Great video ,now its much easier to learn more about JVM .

[@dmitrikonnov922]

Matter of fact, to know how jvm works is terrifically important, this topic hasn't been covered enough though unlike all other fancy stuff. Thumbs up!

[@shreyapatil4471]

great tutorial.. explained every detail.

[@utkarshkdave]

Wonderful. What a explaination. All and all, perfect. That helped me a lot understanding the actual JVM, one of the areas on which i have been working since several years now

[@GeoPoliticsCollection]

Awesome, beautifully and crisply explained. Thanks so much.

[@pk61435]

This is the best explanation I've seen on this topic so far! Huge thanks to you!

[@VinayakPanchal007]

I'm so impressed. An in-depth and crisp architectural overview. Keep doin' the great work!

[@SMARTARIX]

Awesome Video, thanks for sharing it.

[@jlestua]

thank you very much for your great explanation it has been very useful to understand how JVM works. congratulations for your video.

[@javedakhtar-om2hb]

Lovely Presentation with key points of the JVM architecture.

[@enjoywithvivin3379]

Excellent and very helpful to explore lot about JVM. Thanks.

[@nadeemkauser446]

Amazingly informative.....Great Explanation...Thank You.

[@hassankalaldeh8408]

Excellent tutorial to understand JVM arch. Thanks!

[@fuucktheclowns]

Great video, great lesson! Thank you.

[@SilentPushover]

Perfect! I regret having a look at this video after going through some interviews...nevertheless glad to have such a detailed yet well summarized information explained so smoothly :) looking forward to watch many of your videos and learn..Thank you!!!

[@rmandar16]

Excellent way to simplify such a vast topic. Very good explanation, to be understood by even a Lehman. Great Job! Thanks much!

[@sreenivasuludoniparthi7534]

It's amazing tutorial and great explanation

[@MarcoMontaltoMonella]

I liked the presentation.

[@arnabthakuria2243]

Amazing tutorial , sir . Thanks for sharing your knowledge.

[@nawnitsen7771]

couldn't ask for ymore simpler way.. you are a life savor.. thanks man!!

[@majidzolfaghari630]

Thanks Ranjith! This is one of the best presentations (in any area) that I have seen! You avoid mistakes that many technicians do when they present. Masterful!

[@shrikantjesu3665]

Thank you for excellent explanation. You articulated lecture about JVM in proper format and lucidly which helps us to understand what exactly JVM does under the hood. Loved your session.

[@rssrikar]

Excellent!!!! thanks much for such a careful and detailed session.

[@cparthas]

Great work! Thanks for doing this.

[@derringerbilly]

Very good explanation! I liked all of the simple visuals. Thank you.

[@RanjitRajD]

Simple words explained very complicated architecture. Thanks for your good effort. Keep going. We are now big fan of your videos.

[@ambareeshreddy5289]

Awesome explanation of JVM internals.

[@deepdiscover]

Clear explanation of each step with enough time spent through every important point! Very helpful , Thank you, Hope to see more videos coming through.

[@shajirn]

I happened to find this by chance. Awesome work, Ranjith!

[@ivanraineri6831]

High Quality, well done

[@appapujari]

Great explanation ..Thanks for sharing this video .

[@reviliant]

Very nice...thanks for sharing!

[@abhisheknag6689]

excellent presentation and explanation. thank you very much for the lesson.

[@rajesh80]

That was good presentation. Appreciate you taking the effort to share it with us. Thanks

[@nihanthdara]

Good Presentation for understanding the memory of JVM.

[@traktorba]

Excellent video, Thanks!

[@kvr6031]

Nice Explanation. Many Thanks for your effort

[@chandanbhardwaj22]

Thanks a lot, it helped understanding the JVM

[@vincentantonyraj]

Asweome learning videos Bro! Keep rocking!

[@TheFlyguy31]

I enjoy your tutorials because you always go into depth and everything you say makes sense. Hence why i have subscribed.

[@tejasthacker178]

Thank you for uploading videos. very well explained.

[@neerajjassal8750]

Pretty nice explanation ... Thanks for sharing your hardwork

[@manasranjan4]

Really very nice ... thanks for sharing this.

[@vivsameer]

The best explanation of JVM I ever heard.

[@vaibhavsingh144]

Thanks a lot for such a crystal clear explanation of JVM and it's execution

[@MilanChe56]

Great presentation! Nicely done!

[@HarishMahendra]

Cool presentation very well explained!!! Thanks :)

[@tonyputhenveettil5405]

It's really cool... Thanks a lot for your effort! Your approach is also great.

[@DershiTsi]

Very helpful video! Thank you!

[@shashankneema4307]

Very good explanation of JVM architecture!!!

[@raedsalih6401]

Very nice, thank you

[@kumargaurav5155]

Fabulous Explanation!

[@okavari5940]

Thanks, well broken down explanation of JVM.

[@mileshoo2873]

VERY VERY VERY useful tutorial, THANKS A LOT...

[@rahulpatil5897]

very good explained sir all dout clear no 1 video thanks so much

[@samuelhabtemariam7240]

Great presentation and content. Thanks!

[@AbdelmuniemAbdallah]

Well Explained in a simple way, I have understood now how JVM is working. Thanks a lot.

[@ranjithramachandran5928]

Abdelmuniem Abdallah - Thanks, feel free to ping me if you have any questions.

[@kpradeep12]

Thanks for the tutorial. You explained very well

[@dhananjaykumarsingh8057]

Nice Explanation, thank you very much

[@vivekjacas3425]

I like the way u teach. Clean and Simple. Best way to learn Thank you

[@andriyyarish8628]

Very valuable video, thank you

[@abhijitsarkar482]

Excellent video on the internal structure and workings of jvm. Thanks a lot

[@298sohail]

excellent explanation in superb descriptive way (y)

[@hasitha7880]

Excellent tutorial. Subscribed.

[@guntassingh1]

Excellent tutorial .... haven't come across something so comprehensive on JVM so far

[@venkateshmodepalli8431]

Very helpful information. Thank you very much.......

[@lovelysaxena7599]

Thanx a lot for this amazing video.

[@VinothkumarJayandiran]

Thanks Ranjith for the detailed explanation. Appreciate it.

[@MrRamesh940]

Excellent presentation. very well explained .Thank a lot.

[@harikrishnab4937]

Explained very good. Thanks

[@raviraj5941]

Best explanation of JVM I got till now. Awesome work. :)

[@rambabukadali1817]

Well explained. Great Job

[@codedigestwithmrwallet4768]

Brilliant. Thanks for the explanation :)

[@vishalbahekar]

Very precise presentation on JVM architecture

[@harshitagrawal6299]

Awesome lecture on JVM Architecture..

[@parthec1]

Excellent detailed video,,,

[@deepakarora987]

Best JVM explanation i came across

[@piyushjha9382]

superb. cleared a lot many concepts

[@byronwang5539]

Easy to understand. This is what I am looking for. thanks to Ranjith for your sharing

[@Mohamed-uf5jh]

Excellent , every java programmer must watch ! Thanks Sir!!!!

[@lifeisfun9]

Thankyou for such excellent video. Its the best.

[@PavanKumar-yj8fu]

It was a great lecture on JVM, thank you very much for the video.

[@markcaruso8313]

Thanks so much for this video. It is a great overview of the JVM. It really helped clear up some of my basic questions.

[@lmagiczlukas4891]

Thank you for this great tutorial!

[@Gajendra.Sukalkar]

Simple and clean, thanks for creating this video :)