Troubleshooting OutOfMemoryError - Heap dump, Eclipse MAT

Learn how to troubleshoot OutOfMemoryError using the Eclipse MAT tool. You will learn best practices, cool tips & tricks to debug memory problems effectively.
If you liked this video, you'll love our Java Performance Masterclass. Learn more:
ycrash.io/java...
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Topics covered in the video:
0:22 - Memory leak Demo code from Opensource BuggyApp
3:33 - Object Hierarchy
4:45 - Application suffered from OutOfMemoryError
5:00 - How we can diagnose OutOfMemoryError
6:00 - How you can capture heap dumps?
9:25 - Eclipse MAT Titbits
15:36 - What is Shallow heap and Retained heap?
24:28 - Elements sitting with MapManager
27:34 - Who is creating MapManager?
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Links shared in the video:
Buggy App:
buggyapp.ycras...
HOW TO CAPTURE JAVA HEAP DUMPS? - 7 OPTIONS:
blog.heaphero....
Eclipse MAT - Titbits:
blog.ycrash.io...
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Our Tools:
yCrash: yCrash.io/
GCeasy: gceasy.io/
fastThread: fastthread.io/
HeapHero: heaphero.io/
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SRE Community:
Need help in troubleshooting your performance problems?
Post here: answers.ycrash...
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Follow us on:
LinkedIn: / ycrash
Instagram: / ycrash_rca
Facebook: / tier1app
Twitter: / tier1app
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Related videos:
Shallow Heap vs Retained Heap:
• Shallow Heap vs Retain...
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[@MrMMohsen]

Absolutely useful for someone with no MAT experience at all. I'm very grateful for this great intro. Thank you sir.

[@BalajiChopparapu]

Awesome job yCrash. Please continue to educate people on memory problems. Which are tough to diagnose and fix

[@Kcul-bg2ek]

I"m very new to JVM, Java, but after watching this, I feel like I know what to do and look out for in the short period of time. Thanks so much

[@diptiranjanbarik6797]

Thanks for the detailed explanation. Would like more on Performance engineering troubleshooting session on thread dump analysis, network delay analysis, UI Profiling and analysis. It will be really helpful to everyone. Thanks again.

[@pankajpandey7556]

This video is a gem for troubleshooting OutOfMemory issue. Great way of explanation man.

[@warnercooler4488]

Thank you so much for this amazing, well thought out tutorial!

[@jonesalapat6199]

Awesome explanation

[@nizamknr6495]

Very informative tutorial. Thank you

[@rajeshg3570]

awesome explanation. have been waiting for this kind of explanation for a long tie. Thanks for the awesomeness

[@srikantakumarsahu2875]

Very much Informative . thank you so much for sharing this valuable info.

[@MbSbAquaGamer]

Excellent video on heap dumps

[@shirish2005]

Best explanation

[@ramkowsu5295]

Precised explanation

[@sattish99]

Awesome video very well explained with an example u cleared most of my doubts thanks a lot looking forward to your videos about how to compute TLAB pressure and off-heap analysis

[@joinmeki]

This was really helpful.
Thank you

[@rajeshkishore7119]

Excellent explanation

[@masterx4543]

great one

[@amitkumarsharma7449]

Thank you for this video, it is very helpful for beginners. Especially understanding the terminologies used. Thanks a lot.

[@ycrash3227]

We're happy to know that this video is helpful @Amit Kumar Sharma.

[@queenyilin]

This is very informative and well explained. Thank you!

[@karthikg9479]

Thanks for the Great explanation. Very Useful.

[@srinivasbarla8064]

Great Explanation. Thank you

[@vigneshkini9489]

It was nicely explained..

[@pallavikattamuri5653]

Thanks

[@sebastiencuber7088]

Awesom - Many thanks Sir

[@lifessummerleaves]

thanks for the video, very useful!

[@namratashah5116]

Excellent content!!😀😀 Thank you

[@AlexejSailer]

Thanks for that!

[@nikhilgala25]

nicely explained. this is what I was looking for !! thanks

[@gbizkitgameplay]

Nice one! Thanks 4 sharing 😁

[@mpramod1305]

Many thanks for the video

[@rajashekarreddydn3570]

Thanks it's very insightful

[@MrMuralikrishna1982]

Really a detailed explanation.

[@BalamuruganC-yv6ep]

Thanks for the detailed explanation sir.. ❤ Hats off to you..

[@pandit163]

Very useful. Thank you.

[@mrrishiraj88]

thanks

[@danielsatheeselmo4889]

Thanks a lot, very helpful video, keep on going!

[@abhishekomprakash4074]

Very helpful👍

[@rameshc6074]

thank you very much. Great explanation.

[@deepeshmohan9165]

Thanks for the great tutorial!!

[@its_actually_funny_that_yo9345]

You are the boss

[@kinzki]

Well explained, thx!

[@EngineerWithAWhisk]

Very helpful.. thank you ☺️

[@punnuarora68]

This is soooo informative! Thank you :D

[@waagnermann]

thank you bro!

[@VarunKumar-ql6zn]

this is helpful.

[@sanjeevak1]

Hi Ram, i have doubt like , when i generated heapdump, observed byte[] has been getting increasing continuously. how to check that byte[] is getting increasing

[@747r7]

I feel your explanation on retained heap size is slightly misleading . As per my understanding, retained heap is the amount of memory that is kept alive by an object after a GC . That being said, when A is GCed, the allocation for C and it’s sub tree will be returned back to the heap. What it retains is B and it’s subtree , which accounts to 30bytes.

[@VinothKumarthottimandaikadu]

superp explanation...

[@kamra.gaurav]

Superb

[@littleheroshreyaanaarya4690]

Thank you very much

[@madhurireddy3265]

What does total size indicate? Is it the total occupied size in old gen space?

[@ycrash3227]

Hello @Madhuri Reddy, Total size is the size occupied by object in memory! For further details/ doubts, please mail to [e-mail]

[@tejaswinimandadapu6701]

I got PgResultset memory leak but how can i identify which query is causing that leak?

[@ramlakshmanan5313]

If you investigate the resultSet object's content, it will tell the data you are retrieving. This data might give you a hint on the query that is causing it.

[@csm2526]

What about other 4 heap dump options? MAT is built in or where will I get it?

[@ycrash3227]

1. What about other 4 heap dump options?
Take a look at all 8 heap dump options in this blog: blog.heaphero.io/2017/10/13/how-to-capture-java-heap-dumps-7-options/
2. MAT is built in or where will I get it?
MAT is not built directly into Eclipse IDE by default, but it can be installed as a plugin. You can download and install MAT from the Eclipse Marketplace or directly from the Eclipse website.

[@csm2526]

​@@ycrash3227 you forget to mention JConsole .

[@rameshc6074]

10bytes

[@rameshc6074]

40 bytes

[@MosiaTV]

Nice try

[@vanshikapatel5669]

E❤lopp😊🎉xjx

[@marior9582]

When i open my heap dump file and try to open the Leak Suspects window, this error shows me:
Cannot invoke "org.eclipse.mat.parser.index.IIndexReader$IOneSizeIndex.getSize(int)" because the return value of "org.eclipse.mat.parser.index.IndexManager.a2size()" is null
How can i fix this?

[@ycrash3227]

1. Ensure that you are using the latest version of Eclipse MAT.
2. Verify that the heap dump file itself is not corrupted. Try opening the heap dump file with other heap dump analysis tools or try generating a new heap dump to see if the issue persists.
3. If above steps didn't work, You can tryout with another heap dump analysis tool HeapHero : heaphero.io/heap-trial-registration.jsp

[@marior9582]

Thanks for the answer@@ycrash3227 I finally fixed it editing the MemoryAnalizer.ini file adding the line -vm and under that, another line with the path of my JDK (it has to be higher than JDK 11 to work)

[@luismaini]

thanks