NEVER Write This Line Of Code In Production. Seriously
ฝัง
- เผยแพร่เมื่อ 14 ต.ค. 2024
- In this video I will show how a simple line of code can bring your entire application down and cause Java Heap Space fill up. Yet a lot of beginners do this time and time again.
SELECT * FROM table - What is wrong with code?
#java #springboot3 #debugging
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I'm not a Java programmer, I work in other languages;, so my question is, why is your SQL-query string mutable? (`var`) Why not use `val` there?
Real email at 3:40 ?
Hi, I got that error when trying to get data to report from a database by jdbc query..I want all these records..Is there any way to handle that case..?
Salam aleykoum brother as a backend and DevOps Engineer I love your channel but i specifically loved this video that depicts what we actually do in our day to day job and the entire process from debugging, development, testing and finally deployment.
Exactly! Thank you for presenting the full journey! This is gold!
That's amazing. Coding is the first step, the second step and so on is trying to maintain the app work. I have a long list of exceptions to debug on my day to day job
the person who broke the application did great favor for the junior developers like me to learn and write safe queries in production thanks nelson ❤
Love this, perfect opportunity to show full dev cycle with debugging, code commits and ci/cd pipeline to deployment.
Salam bro,
Ramadhan mubarek! as an SDET we always face these kinds of issue when running load tests or automations scripts! thanks for the video and eid mubarek soon inshallah
I writing own study spring project as a course as well. And definitely saying - you did a grate job. And this is a just a bug in production. Critical, but solved. Nothing more. Thank you for you work!
lol, you remind me when I was a Superman - design, build and manage server all by myself. It was stressful if something happen and hope boss didn't find it, because so hassle to handle office politics with other. I wonder why you not limit list in first place and don't forget to auto backup database which I often forget and it become really mess when I accidentally clean table record because client said the server is testing but actually production. Btw, welcome to online world. 😀
How you decide the page size… what if the page meta data grows horizontally? Will again need to reduce the page size?
I think you might’ve done it as a mistake, but I think it would be good to censor-out the user data, especially their emails, age, and gender - love the contents and keep it up! 🙂
The emails look really fake and randomly generated. So I think its okay. But nice catch!
Salam Bro. Thanks for your inspiring tutorials. I have a question about the platform where your application is deployed? Which service are you using? I just saw Elastic Bean Stalk. Does it also have a sandbox environment? What platform would you recommend to play around with the whole pipeline from development till deployment using container technologies like docker. Thanks in advance.
I love this. Thanks for sharing a live issue! Might be a good reason to discuss bloom filters or web application firewalls to mitigate these issues beforehand? *e.g., you’ve stopped the crash, but you’re still paying for all of that bad data to be stored by Amazon! Again, thank you for your videos! They’ve been extremely helpful in my journey to learning S.E.
We need more like this recommendation for the production
Great video! Important topic to keep in mind for all developers. Anyway do you have a video where you show Elasticbeanstalk Deployments with Docker image? Thanks a lot
I've one question! Earlier we were getting OOM exception because we were creating 120K objects in heap. But what if 1000 users now access your application so everytime 1000 objects will be created. How will heap handle it?
Nelson, please could you add a Gradle(in place of maven) implementation to your course ?
Very nice video. Very useful. ... Do you have a course on building a Spring Boot app and deploying it to AWS ?
Loved it maan... Thanks👌
We did have some kinds of this issues in production because some colleague have Add a lot of FETCH in HQL method
I did not expect a lesson with a slice of the software engineer life. (Jokes aside, nice, humorous video!)
This video is just in time! Thank you!
Selamin Aleykum, Hi brother, I think it is also worth to mention that browser has also limited capacity to display.
Other solutions to that can be pagination and ajax call with bulk append. What donyou think?
oeps i think you missed the where/limit conditions. that will cause a heap space exception for sure. i've seen this aswell. Data engineering is often a missed skillset for pure java devs.
Hi Nelson. Could you please tell me which theme are you using for IntelliJ?
wonderful resource , but what recommendations Incase I to generate a report from large dataset from database.
Yeah, lot of these kind of problems are really occurring in tech companies... 🙄
In my junior year I once pushed select * records with no limit. My PR wasn’t reviewed properly and no tests were implemented. You can guess what happened next 😅😂
Do you have a CI/CD course? That what you show was very interesting.
I think I'm a mind reader already 🤣
P.S. this comment is a Fan(friendly) comment
N*son inner voice: I will ruin your production by loading huge amounts of records that your code is not ready to handle
N*son: ohh, great plan! I can create content showing the real-world issues encountered by these companies deploying codes without big data testing
N*son inner voice: YES! right on point!
N*son: YEAH! then I will also blame you for what happened...
N*son inner voice: yeah, let's do it!..... Eh wait what? 😕😶🌫😶🌫
hey, thats very cool unit test animation there
How about implementing Lazy Loading using Spring.
와 네이버로 보고 들어왔네 오우 깜놀ㅋ기 thank you good video!!
It looks like they really are fake accounts because the real ones have profile images but the fakes have no profile image, perhaps you could delete the fakes if verified.
Hi, I've a question,
it's it good idea, when I getAll data from my db which is almost 1M data, and at the view page i use a datatables which is have a paging feature?
I encountered this when I was building a music application with javafx the program reads all music files from the computer and convert it to my custom song class then it writes to text file with printwriter for later use and when it tries to load my custom song files from a text file it throws java heap space error
Hommie you can do the same shit but way better with jpa rather than jdbc. Also if you use paginate you can stream it as much as you want without facing mem related crashes.
thank you for sharing knowledge and experience 😊
Great video and you definetely have a point
Hey hey Giorgi's here! 🙌
This problem completely obvious for any SQL developer so that means - learn database before!
I have the same issue on my site just a bunch of random generated users and contacts i need to add a captca and 2-factor id
where exactly heap memory error is coming out, unable to debug. can you tell me in gcp how to debug heap memory of particular server.
Salaam alaikum bro please create a video on how to draw the the application stracture and architecture using intellij
Hahaha..... Amigooo!!!! It was not my fault!!!! Lets go!!!!
@amigoscode what if we want to export 1 lacs data into file i.e json file . (Using api)
9:58 Damn, I almost forgot how slow build is in Java.
That has nothing to do with Maven builds, what is taking so long is running the tests. And it seems he's not only running basic unit tests but also integration tests which usually takes more time.
Should the test expect results
From what video is this project on?
I would be nice create new topic (tips) and playlist with advices like this
119k is a rookie number, but i guess some servers can't handle shit
Come on man, you can't miss that. :)
that is DDOS attack ...
Salam Aleykom. If I want to fetch all. What should I do then?)
Add a lot of ram memory :)
What if 10, 100 or 1000 people wants to list the page at the same time what will happen? 1000 * 1000 = 1.000.000 of objects
You can try it yourself and see what happens. just write a skipt that calls the endoind 1000 times
What about using cache ?
Now it’s interesting to find another issue that will break your app brother😂
3:05 Should you really be showing this?
3:10 Oh I see, lol
When will i get to the stage of understanding all these😒😒😒😒😒
you did nothing just add a limit how what if you need 1001 or items from 1000 to 1100, it could be fine to show how to use pagination and offset as well
🤷♂️ Walahi wasn’t me…. Nothing to do with me I swear. Masha’Allah
I really hope that the customer data shown, is created randomly and that you're not showing the original database here? ;)
He explains that those are fake accounts. If you look at the emails for each you can obviously tell.
@@glennmerrill88ify My bad, I think I missed the part where he said, that it's fakedata. That's good, 'cause otherwise I would be really conserned about the integrity of his database :)
bro math is important when it comes to software engineering
🤔
definitely random, you can see that none of the emails match their names lol
why put music ??? )::::
I did this.
That's why I use tests with real components instead of Mockito :D
Integration test
@@andresnator right, i test my method with real comps and h2 so I guess its considered integration instead of unit
988th...Thanks
أحبك في الله أخي
Whoever is reading this, never give up. God is with you.
Hi
Need video on java 8 Date and Time
Really? Java 8? Switch to something newer. Java 17 is LTS.
Assalamu Alaykum amigoscode
I love the content. I wanted to notify you as you are muslim that at 11:48 you said fingers crossed multiple times and we ass muslim are forbidden from ever saying that as it is what the christians do (referring to their belief of jesus) and is shirk. I love you for the sake of Allah and wanted to notify you. Again love the content!
Your hate has no place in this video. Disgusting.
Jesus...use spring data and proper pagination...
Third here
First here
"I didn't expect..." Always expect. Proactive is always better than reactive.