Understanding JVM Memory, Heap, Garbage Collection and Monitoring the JVM | Tech Primers

This video covers Understanding JVM Memory, Heap, Garbage Collection and Monitoring the JVM using JVisual VM.
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Video Editing: iMovie
Background Music: Fredji
Joakim Karud

[@santosh1303]

Did not know about the JVisual VM. Learnt it today. Informative. Thanks.

[@davie-on8gh]

I love all your tech videos.. short and full of great info

[@TechPrimers]

Glad you like them!

[@rameshlanka171]

Wow informative .....voice is so clear I understood a lot. Thank you Dude....!!!!!!!!!!

[@sandeepchunduru1964]

Simple an clear…. Nice video👍🏻

[@thuglakcho59]

Thanks man..very informative and concise..i wish it had closed captions turned on

[@TechPrimers]

Thank you. Glad that was useful!

[@simransinghsandhu7827]

thank you for these concepts

[@vinayh.m.9017]

Hi, this i my first comment and have been following your videos for some time. All videos are quite useful and I like the fact that you keep posting videos on latest trending technologies in the market. I highly appreciate your efforts behind these videos in collecting and well presenting in a compact and nice way. Keep up the good work. Btw, you may want to upload some video related to how class loading works in detail and errors that most programmers run into wrt class loading, conflicts, versioning issues, etc

[@TechPrimers]

sure. thanks Vinay. Will do that.

[@vinayh.m.9017]

Tech Primers Thanks!

[@davidtheprogrammer]

Fantastic video! Thanks 👍🏾👍🏾

[@balkrishnatalke7484]

Very Great video, Nicely explained the JAVA Memory Model, Thanks for this video ...

[@sbylk99]

The best explanation

[@harshbarnwal1879]

Great video🔥

[@sbnighut]

At 8:32, "Age" was called not primitive, whereas it is a primitive type variable and hence placed in the stack.

[@TeluguAbbi]

exactly what I was wondering. It's int and is primitive.

[@VikashSingh-gq9dd]

Same here!!

[@lahiruasanga3813]

int is primitive

[@dineshchandgr]

Excellent Video

[@anupsingh-gu3ph]

can you upload a video having how to manage the memory with a real life example. let suppose you are facing some memory issue, or how to manage performance issue. -thanks

[@basireddyhari4535]

Well Explained

[@dineshchandgr]

hi i have a doubt with Tomcat Thread Pool vs Executor thread pool. If tomcat server thread pool is 200 and we set executor thread pool to 10, do we have 210 threads in total?

[@Priya1_123]

Well explained .

[@mihir206]

Hey great video could you demonstrate memory leak and fix it onna basic level?!!? Thanks in advance

[@firozpasha2766]

Where are jre and application classes loaded, metspace and permgen respectively ??

[@rhuchanarkhedkar2646]

Excellent

[@blackmouthblackface]

1:50 I'm not sure I understood you correctly. The references to the objects (not sure what you mean by primitive objects by the way) are stored on the stack.

[@basavaraj2065]

where is STACK memory in the components diagram ?

[@xh3992]

Hi could you do a video on low lantency java programming with microservice design pattern? Would be good if you could show a simple example!

[@GodOfGizmos]

Hi Ajaykumar, This video was very helpful. Thank you. I have 2 suggestions for this video. 1. Divide this video by adding chapters 2. When you were trying to explain Heap & Stack, I could not follow. I would request you to have cursor movement around it while explaining the flows/diagrams.

[@anilarkay]

Same thoughts here. No one could really sense where on the screen they were supposed to concentrate.

[@anupjuly]

Can you share video where you are debugging a memory leak issue on prod. we are facing mem leak issue on API running on server , No idea how to start debug it go get the reason.

[@IndianEuropa]

simple yet usefull

[@ankitmahesh007]

very nice

[@chinmaydas4053]

Sir now java10 in details..

[@techvideos3891]

My understanding might be wrong here. At 7.25 you say the object reference is stored in the heap. But does the object reference gets stored in the heap or is it the object(instance) that gets stored in the heap? Because as far as I know object reference indicates the reference variable and that is stored in stack (again I might be wrong here). Would like to get your view here

[@preetinegi7674]

i second with what you said

[@rushikadivar5616]

The Object (Instance) stored in Heap which holds the actual data when in terms of stack the reference where the Instance is stored in heap is store in Stack as part of the JVM process. as you know java is pass by value so it pass the value of the reference where the object is stored in Heap.

[@siyedyoussef3202]

such great video keep up #Like

[@TechPrimers]

thanks Siyed

[@maithreyibalakrishnan7247]

Could you please explain how load balancing is done in production enviroment ?

[@TechPrimers]

sure Maithreyi. Will do

[@shaarg]

Nice! Java 10 - thoughts on JEPs please

[@TechPrimers]

Looks like you are from the future... Asking about Java 10... :)

[@pallavikashyap6189]

Can you please help me in knowing which will be the best command to get to know about the heap space covered by a process in server

[@TechPrimers]

It depends on the type of process. Also you can see what is allocated only at the server level. If you need to see how much heap the application process uses, then you be to connect to the instance for profiling it

[@pallavikashyap6189]

@@TechPrimers I have tried to get the heap usage info by gstat command and it works...

[@alexeystaroverov4804]

hmm, isn't The Java memory model describes "how threads in the Java programming language interact through memory" rather then "Understanding JVM Memory, Heap, Garbage Collection and Monitoring the JVM" ??? I'm surprised...

[@mahendharkhedhar7887]

NYC vedio

[@abhikumar2469]

Where does STACK resides.... Heap, Non Heap

[@sbylk99]

Starting from 9:30, Garbage collection

[@sonnix31]

Correction: Full GC happens on entire heap space; both young + old generation.

[@SantoshSingh-oh3wc]

Make a video on jmeter

[@TechPrimers]

sure santosh

[@AshishAshish-fp8po]

Wrong ... About Heap ... Heap will never contains static data as you said, This is true. Method area section was used to store static variables of the class, metadata of the class, etc. Whereas, non-static methods and variables were stored in the heap memory.

[@nagavadlapudi7485]

Surprisingly confusion started when you showed an example at 7:03 No one gave this sort of example, but it's very confusing as you are not pointing anything while explaining, I found it very hard to follow and lost interest to move further.

[@boopathirajagopalan3047]

Very confusing

[@harrysingh5556]

confusing

[@reenakumari5510]

Use 1.5x speed.

[@harinathnaidu1343]

Not teaching well