JVM ( java virtual machine) architecture - tutorial
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- Опубліковано 4 тра 2015
- 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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Man, I have already watched this video like 5 times and I keep coming back to refresh. Kudos
Same here👍
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.
Great tutorial man~ Best thing I've ever found to have JVM explained so clearly in such a simple way.
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!!!
Very well explained. Thanks for creating and sharing the Video.
Excellent presention Mr. Ramachandran.. Exactly what i was looking for.
Thanks again n again.!
Very simple, nice and easily understandable... thanks for sharing.
One amazing tutorial and very well explained. Thank You!
I liked the presentation.
Awesome Video, thanks for sharing it.
An excellent, detailed, on-point overview of the JVM. Great work!
great tutorial.. explained every detail.
Excellent detailed video,,,
thank you very much for your great explanation it has been very useful to understand how JVM works. congratulations for your video.
despite slightly outdated it's one of the best videos I've went through, perfect to start with
Very nice, thank you
Great video ,now its much easier to learn more about JVM .
Awesome presentation with all the images. Thanks and awaiting more of your videos.
Very nice...thanks for sharing!
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..
Lovely Presentation with key points of the JVM architecture.
It's amazing tutorial and great explanation
Excellent video, Thanks!
Great explanation ..Thanks for sharing this video .
Very valuable video, thank you
Excellent and very helpful to explore lot about JVM. Thanks.
Awesome, beautifully and crisply explained. Thanks so much.
Awesome explaination
Excellent way to simplify such a vast topic. Very good explanation, to be understood by even a Lehman. Great Job! Thanks much!
Great video, great lesson! Thank you.
Amazingly informative.....Great Explanation...Thank You.
really wonderful..
excellent presentation and explanation. thank you very much for the lesson.
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
Really very nice ... thanks for sharing this.
Amazing tutorial , sir . Thanks for sharing your knowledge.
Fabulous Explanation!
Simply Awesome.
Excellent tutorial to understand JVM arch. Thanks!
excellent video...thank u very much...
Good Presentation for understanding the memory of JVM.
Excellent!!!! thanks much for such a careful and detailed session.
I'm so impressed. An in-depth and crisp architectural overview. Keep doin' the great work!
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!
Great Explanation
Great work! Thanks for doing this.
Nice very good way of explaning
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!
Awesome explanation of JVM internals.
Very useful.
Thanks very much
That was good presentation. Appreciate you taking the effort to share it with us. Thanks
Awesome..... Thanks
Great video.
Good and simple explanation.
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!!!
Well explained. Great Job
Awesome explanation .....
Thanks a lot, it helped understanding the JVM
Very good explanation! I liked all of the simple visuals. Thank you.
Simple words explained very complicated architecture.
Thanks for your good effort. Keep going. We are now big fan of your videos.
Clear explanation of each step with enough time spent through every important point!
Very helpful , Thank you, Hope to see more videos coming through.
Good , nicely explained
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!
Excellent video... never seen a better one on JVM. Thanks a lot!
Fully agree!
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You can also watch this
Very nice overview!
great tutorial
Very precise presentation on JVM architecture
Excellent one. Thanks.
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...
High Quality, well done
Awesome lecture on JVM Architecture..
Great presentation thnx
Thank you for uploading videos. very well explained.
brilliant demonstration
amazing video
Thanx a lot for this amazing video.
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.
Thank you for this great tutorial!
Nice Explanation, thank you very much
Thank you for that video.
Pretty nice explanation ... Thanks for sharing your hardwork
Great job.Thanks a lot.
Nice Explanation. Many Thanks for your effort
Great one !!
Thanks for the tutorial. You explained very well
This is a great presentation
Great presentation and content. Thanks!
Thanks a ton, great explaination
Awesome work!
Thanks, well broken down explanation of JVM.
Explained very good. Thanks
Very informative video.. good work
It's really cool... Thanks a lot for your effort! Your approach is also great.
helpful video thanks
This is the best explanation I've seen on this topic so far! Huge thanks to you!
very nice and helpful
very nice video.. so simply understand everything
Another awesome video
Very helpful information. Thank you very much.......
clear and neat explanation.thanks