JVM Bytecode for Dummies (and the Rest of Us Too)

You've written applications for the JVM, using various frameworks and maybe even various languages. You understand how to rig up the CLASSPATH, get .class files to load, compile source, and set up an IDE. But you've always wanted a better understanding of the plumbing underneath. How does JVM bytecode work? How does the JVM itself work? This presentation walks you through JVM and JVM bytecode basics, with lots of examples of how to bend the JVM to your whims.
Copyright © 2013 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the "Materials"). The Materials are provided "as is" without any warranty of any kind, either express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement.

[@paulojmsilva82]

Second part link: kzbin.info/www/bejne/ZorYlWeHZ614sJY

[@bonbonpony]

15:57 If they're really that concerned about size, they wouldn't be stuffing the .class files with so much useless data. The bytecode is usually less than 1% of the .class file, while the constant pool takes roughly 90% of it, with a LOT of repetition and redundancy! :P

[@alekseykolesnikov1412]

there is a mistake at 15:33. The instruction mnemonic is icosnt_[m1-5], not iload_[m1-5]

[@quaternaryyy]

Really wish they showed the actual java bytecode instead of the weird Ruby pet project...

[@vetiarvind]

I think it helps clean-up the presentation

[@ioriogami]

dup2_x2 is to push to the slot 4 instead of 3. the demo is actually dup2_x1, right?

[@ShivaKumar-it1yc]

Aggelos Biboudis before commenting you should watch, its a good one.

[@petercheung63]

professional, thank you Sir

[@prithwin]

Hi, how did it store the string hello in the 32bit wide stack, also when you said array objects need to be on the stack. does that mean that all the contiguous memory locations need to be on the stack.?

[@LambOfDemyelination]

It just stores a pointer doesn't it, not the whole thing on the stack.

[@isapir]

Excellent presentation, thank you

[@badhaiarun]

where static string memory will be allocated.

[@jonassx100]

Arun Badhai method area

[@rahulpatil4144]

In method area scp

[@Levi90001]

Starts at 2:50

[@BenjaminChengCS]

Anyone know a link to the part 2 mentioned?

[@Dimass036]

+Benjamin Cheng That link is broken, this talk seems to be on the same topic, though it'd been given earlier: vimeo.com/41968163

[@JGunlimited]

I think it's this one - kzbin.info/www/bejne/fJ-neaNpht6UbNU

[@programacion3694]

interesante.

[@布雷-z7h]

good vedio

[@askhowiknow5527]

布雷 Video, not vedio

[@布雷-z7h]

ok.