10 Spring and Spring Boot Common Mistakes You Need To STOP

In this video I will discuss 10 Spring Framework and Spring Boot Mistakes you need stop right now. This is crucial to write clean code.
When writing web app with spring framework and spring boot there are best practices to follow in order to build scalable backend applications.
#springframework #springboot #java
00:00 - Intro
00:22 - Leaking Internals
01:54 - Records
03:36 - Dependency Injection
05:28 - Separation Of Concern
07:16 - Error Handling
09:48 - Testing
12:23 - Annotation Validation
14:43 - Logging
15:15 - XML
Number 10 was Immutability which I forgot to talk about.
Don't Forget to
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❤️ Thanks for watching

[@codingsavid6509]

Can you make a video on propertly error handling?

[@V4dk4n]

Read about @ControllerAdvice annotation.

[@zsombortoreky7678]

You've mentioned at the testing part, that we should not use a different database from the production one (eg.: postgres / h2), I would really be interested in seeing a video about these types of best practices, thanks😁

[@mikeoxlongdnb]

kzbin.infov3eQCIWLYOw

[@nicholasferrara8028]

You want to look in to using Test Containers to achieve this

[@rhumedisi2783]

Thank you very much for this detailed Spring/Spring Boot, "How Not Tos". It's great to see a teacher who consistently and effectively communicate best practices.

[@marcoreinaldi4193]

I agree. I think this video is great and give me insight how to avoid mistake on Springboot. But I hope, he will publish another video with the solution on how to do it right. Not the whole thing, but maybe just an Idea how to do it right.

[@user-fy8vj7el5q]

wow it's 2024 and you're still the best spring youtuber in the whole world

[@aminesafi7261]

For the @Autowired annotation, you should use it if you have more than one constructor otherwise Spring will fail to inject the dependencies, it is a kind of a hint to tell spring which constructor to use. Nice video and very good explanation, keep going 💪🏻

[@igle85]

You shouldn't have 2 constructor for services, it's not a good practice.

[@aminesafi7261]

@@igle85 I agree, I’m just explaining that we can find ourselves in this situation.

[@Denys.Stoianov]

@@aminesafi7261 it is possible to pass multiple services to the constructor and it will works even without @Autowired annotation,

[@aminesafi7261]

@@Denys.Stoianov You didn't get it, read my comment again :)

[@aminesafi7261]

@@sweets7092 Your comment is off topic, thanks anyway 🙂

[@andreinovosiolov]

Thank you for this video. I'm a trainee and you videos are very helpful. Waiting for lesson about proper testing of a Spring Boot application.

[@marcelohmg]

I would really like a video about testing the databese and querys!

[@Maicrash104]

To Error handling, since Spring 6 you can use "Problem Details" like standard and not have your own ErrorDto

[@heduardos26]

Great video, thanks a lot! We'll love to see a video where you explain how to test with the same DB and not use H2.

[@geni4551]

Thank you very much for the explanation. Would love to see why we should not use H2 for testing video! :)

[@rockdarko440]

Thanks for this! I would really indeed like a video for the case against using H2 for testing. We use Oracle in production (migrating to postgres enterprise in a year or so) and would like to hear what you would suggest here. Thanks again!! :)

[@MarcoS-mx1vj]

The problem with using In-Memory databases for testing is, that it doesn't make your tests reliable. Its a completeley different database with a different feature set. A green h2-based test doesn't mean that your code will work in production as well. One solution for this would be using a dockerized version of your production database (e.g. by using TestContainers).

[@rockdarko440]

@@MarcoS-mx1vj Yes, you are ultimately right and Oracle supplies such containers. But the reality often is that developers don't always have the resources on their laptops to run something as hungry as oracle (even containerized that is a beast) and most of all often lack the knowledge/will to set it up. As an ops I would need to create a deployment for them I guess. It's a real shame to be honest, but that is the reality I deal with personally. The model we use for the time being is devs use H2 locally on their laptop, then deploy in a DEV environment where a full blown Oracle server is and although I wish it weren't that way, it does the job. Thanks for replying!

[@TheSpiderWalk]

It would be nice to record one video only about testing in spring-boot, I am currently struggling with testing in spring-boot.

[@narek-tm]

Thanks for your content. Please, make video tutorials on testing in Spring Boot, especially integration testing, test containers.

[@nospamallowed4890]

Thank you, I did not know about records. Seems like a pretty essential, powerful, and very simple to use feature. If I might suggest a topic for a future tutorial that has NOT been covered properly by anybody: Spring Boot 3 + Spring Security 6 + Tomcat 10 (deploy webapp as WAR) + Azure AD authentication & authorization using Microsoft's spring-cloud-azure-starter-active-directory Maven dependency. For extra points or as part of another tutorial... how to handle libraries (like the microsoft dependency above) that use logback when you are deploying to a Tomcat 10 that is configured for log4j2 logging (throws a logback exception when it tries to cast LogbackServletContainerInitializer to jakarta ServletContainerInitializer). Both of the tutorial topics I mention are fairly common configurations that nobody seems to be covering.

[@robertwhite3503]

I often use the actual entities rather than DTO's. These may work with persistence, but I cannot see a sensible way to use records with annotation-based data validation.

[@tedac091]

I've been looking up on how to make the switch from H2 database to tests containers. I would really appreciated a video on it, thank you!

[@just_O]

A small glance of how beautiful code can be, thanks for sharing

[@dshakya29]

Hi Nelson, please make a series on testing Spring Boot applications.

[@bladerunner20446]

Great content as always. Could you please make more in-depth testing videos

[@MrTutiplengo]

Awesome content. I'm new to Spring Boot and this was very informative. I didn't know about Java records at all.

[@feloniousmonkey]

Great content...your points are ones that I do see fairly often. Keep the vids coming 😀

[@feloniousmonkey]

@Valid was correct...@Validated is for partial or group based validation...

[@khaganimammadli6846]

Hi, you are my fav youtuber, you explain clearly and i understand almost everything. I wait from you the best tutorial about functional programming, lamda, streams and etc from zero to hero with simple explanation

[@kirasign4605]

Please make other testing video like what you said in this video. Very grateful for this Thanks in advance! Lovely videos like always

[@sz_peter]

Setter injection is allowed when more then 7 dependencies required in the given class to avoid the "Method should not have more then X parameters" Sonar issue (if you use any static code analysis tools).

[@hamsandwich123]

tbf if you have 7 dependencies for a class you may want to rethink your design. good chance the class is doing too much and can be broken up into smaller classes.

[@Denys.Stoianov]

I see that you have here at 12:00 FakeS3 class, so it means you modify your production code to be able to test it. Why you do not use in this case localstack, it is also a standard defacto like testcontainers for testing. Correct me if I am wrong and this is just for Demo purpose

[@rezaru2000]

Excellent! to the point!

[@bashirzamani5144]

Thank you nelson, please continue this form of videos

[@sphesihlemanuel2933]

Happy to learn, I thought Field injection was the that makes it hard to unit test, and Setter and Constructor injection were fine 👏🏾

[@adambickford8720]

Not setter injection. An object should be in a useable state once its created. Beans are shared by default so you don't want other playing games with it.

[@robertwhite3503]

Constructor injection offers the guarantee that the object has the required dependencies. Setter injection means that anyone using the object has to remember to inject.

[@danielbaptista4925]

Hi Nelson! :) Great video, I would love to see a video about database testing with an practical example

[@482ksd]

Second this. Would love to see how you spin up a container with a real DB in it for testing.

[@Jumataev]

Me also

[@sakthisomaskandan6438]

Great video as always! Can you please make a video on why not to use h2 for testing? Thanks 🙏

[@majesty8309]

I have learnt something new. Thank you very much Nelson

[@matthewsuprunov4497]

great video! well explained, thanks can you please show how to manage authentication with jwt, redirecting after success login and managing roles?

[@DeGoya]

Salamu alaykum brother, could you do a video on @Async and CompletableFuture?

[@abdullaermatov1848]

Would you suggest to use Lombok annotations for getter and setters? Or it is better to do it without lombok?

[@rostomnouisser4023]

please make tutorials about XLD , Jenkins and déploiement of an application , it's important and you can make it simple

[@abhipatel439]

Hey, brother! If it's alright with you, could you possibly make a dedicated video that covers the topic of testing in Spring Boot? It has the potential to greatly benefit your audience.

[@riccardoatwork5291]

The main reason to use dependency injection is NOT "to have Spring do things for you" or "so that you can use singletons". It is used to do dependency INVERSION. Also, leaving the @Autowired on constructors is not a mistake, it servers a role as documentation.

[@mriduljayan4466]

Though xml is verbose it does separation of concerns better. The framework is less invasive as all you have is pojos.

[@limobei5042]

Thanks a lot. I learned a lot. Please let me know, how i can learn better testing within spring boot, e.g. use right and necessary parts of apllication context

[@mark6662]

I understand for most instances constructor injection is better than setter injection but what do you mean by you can't mock the dependencies with setter injection. Surely you can just Create the object and then create a mock of the dependency and pass that dependency in through the setter.

[@carlosrenesoto9650]

Great video @amigoscode Thanks a lot for sharing your knowledge!

[@rajkhare5949]

nice video thanks!!!...why your courses are not available at Udemy??...please start your channel there as well!!

[@niaboktruk]

Amazing content man, I'll watch every video you have. Amazing, simply amazing!!! 🤩

[@richaveli]

Can't wait to see what mistakes I'm already making! 😊

[@usamaabubakar3061]

Can you give more insights about that logger part? What to log, what not to log, best way to use log, and when to use info, debug, warn and error

[@darpanshirsat1712]

Thanks you Buddy!

[@adarshverma3372]

Please make a video on testing Spring Boot Application using Data Sources

[@pguti778]

Very good video! Yes please go ahead and do a video on testing!! Another mistake: not using lombok!!!

[@LearncodewithMuneeb]

Thanks sir for making useful videos for us. But I request you very respectfully to work in a project in spring boot having at least 6 entities/tables using spring boot in the back end and React/Angular/Next in the front end

[@LukmanJaji]

Salam alykun Nelson. Please make a video on why we should not use H2 for testing. Thank you.

[@jorgensenabrahamson6479]

Hi, If I am using java 1.8 where the records are not present, which would be the best approach? create a mapper also? or should we use JPA Projections always instead? Could you please make a video about it? thanks

[@ms-pf9ow]

I learned a lot. Thank you

[@aayush481]

Hi @Amigoscode, your'e an amazing teacher and mentor, we want to buy your full stack course and learn from you, however the price is too high for people in India, as we have to pay in USD...

[@GFunkEra1992]

Thank you brother, very usefull info

[@egamberdijabborov6586]

👍👍👍👍Thanks for the video tutorial

[@monsuruokuniyi1234]

Tests, I'm not doing that enough. We write lots of code at work, and I believe we should also be writing tests along side. But our output rate doesn’t allow it. Can we start writing tests now? It looks like a daunting task

[@sweetphilly2]

Yeah i gotta take some time to learn more about Records. They seem simple yet powerful. Anyone seeing the benefits of them, and mind further explaining their uses?

[@jochanoss]

Essalamu Aleytkum Nelson, I love the way that your IDE looks. Would you make a video of what plugins do you use?

[@feloniousmonkey]

Your points are valid, but I don't think record really matters in terms of exposing internal data..you are on the right path, mapping your entity to dto like that is pretty crude..of course in the real world tools like mapstruct or dozer are used to seamlessly map to DTOs.

[@taners]

hi Nelson, good tricks thank you. which plugins do you use on IntelliJ ?

[@Jumataev]

Hello Nelson! I really would like to see how you test with real database, because recently I saw your video with a h2 in junit testing.

[@robertwhite3503]

It is interesting that so may demos use H2 for testing.

[@gabrielalvesgoncalves9959]

One of the best videos on the channel! Congratulations again, you are an inspiration!

[@seyedaliroshan2386]

Salam, can make a video of what is the difference between using lombok @Data annotation and the record classes and which is better? I couldn't find a good compression and really carious about it

[@talbiabdelali5914]

Could you release a full course of Spring boot testing please ?

[@mujaddidsislam1897]

this video gives me enlightenment, جَزَاكَ ٱللَّٰهُ

[@sphesihlemanuel2933]

Please record a video on testing 👏🏾🙏🏾

[@skynight5207]

Could you please make video about domain driven design (ddd) design pattern with spring boot?

[@Michaeljamieson10]

Highly recommend his full stack course

[@stefanoriffaldi84]

if you pls record video how to avoid H2 in testing, should be amazing

[@sylvereleipertz955]

Good advices for beginners but most of them are not spring boot related. Using DTOs/Records to decouple the database schema from the frontend side or not calling directly the repository in the controller are best practice in every languages

[@TheKanoxa]

Please please please do a video on testing database without H2. I'm struggling in my work with this 😢

[@AdnanAmmanUllah]

could you please create a detailed video on error handling?

[@larcenmenlahcen5998]

Salam alikom akhy(Brother) good job, keep do it. Ramadan moubarak👉

[@nayeemrafsan356]

this is goldmine!

[@jasper-3338]

2. Using records, could have some extra explanation as what it does underwater, basically I use a record with the same variabele name and it looks up a record with that variable name? and returns me a single entity with that name? or multiple within that record? 3. Dependancy @Autowired vs constructor injection, the constructor injection is very good for testing the classes as it can be mocked using mockito. @Autowired is deprecated by spring boot. Good that you give one line for testing, as for testing the dependent classes can be mocked. For the testing is there a sample I can look into ? So I can speed up my own code as well? :)

[@BioDetermination]

@Amigoscode Another mistake what I have seen is not using springdoc to generate OpenAPI documentation. This is a lifesaver to deliver to QA instead of using Microsoft Word.

[@amigoscode]

Maybe I’ll do a video on it

[@alpiirzptr8052]

which you prefer to use for build, maven or gradle?, currently i using gradle cause gradle dependency download faster than maven, sometime maven take a long time to just update dependency even my internet speed is fast enough to download 1 gb for 5 mnt, now i using vs code to write spring and cmd to run spring, does that also affect maven performance compared to using ide?

[@IvanRandomDude]

gradle in 2023

[@LOLdjrabaanLOL]

only maven

[@robertwhite3503]

I prefer Maven rather than install another language (Groovy). In general the download is the same file files for Maven or Groovy. I am not sure if Gradle uses the Maven Repositories anyway. But with either tool, you download once and the data is stored on the PC for future use. Some IDE's use their own build tools. Others use Maven, or at least allow you to run Maven, just like you are doing.

[@alvaroandressuarez]

what is the particular IDE you are using in this video?

[@lmrl021]

Great video. Can I request for another video for possible solution in one of those mistakes? Thank you.

[@danielthompson3082]

what's the difference between @SpringBootTest and @DataJPATest and why should I only use the former once?

[@nikolayverkhovtsev3886]

Is this IDEA or what IDE u use in this video?

[@ClaudesGomes]

what extensions do you use in the intellij?

[@kazbo4431]

Bro! Thanks for your videos!!! That really good, you the best! Can u record video about how we can effective and easy test JPA methods ? (10:56) Idk how i can test that: should i test crud operations from service layer? or i need test that from clean repository...

[@robertwhite3503]

Generally the advice is to never test the methods that are provided by third parties, like basic CRUD, as they should already be tested. To the extent that you have amended the code with JPQL or specific parameters you should test these. Everything you can do in your main java code can be done in the test code. For example seting up a test databases. Once you have tested the database layer you should not be testing it again. Your service layer tests should mock out the database layer using something like Mockito. If you can save a record in the database layer, there is little to be gained from showing you can save a record in the database from the service layer. Just prove that the service layer is trying to call the mocked database layer. That keeps your service layers quick to test.

[@luca_raveri]

what about field injection with the annotation @Autowired? is this a good practice or should be avoided? if yes, why?

[@lubodimitrov8778]

could you explain why we shoulnt use xml? do u recommend using gradle?

[@shanagondaarun2436]

What's the theme called. How to apply it. Looks dope

[@vacheyepremyan4252]

thanks

[@Asingh42]

14:20 what is diffrence between jakarta validation and spring ones?

[@StefanoRiffaldi]

video about exception handler and validation RIGHT NOW

[@NotNaveedKhan]

Spring Boot provides validation dependency which i more better way to do the validation of request object. Also, I would like to know how do you map the data from request to entity and from entity to response?

[@ollySun]

How is the fasting going? hope its good. Please do a complete tutorial video on testing

[@bartoszrocha5028]

You did wrong with validation, its the @Valid annotation, like you thought, but you will need additional dependency to validition in new version of spring boot.

[@shefeeqpm5413]

404 status code can be security breach sometimes. It leakes information whether some user exist in system or not. In that case its better to return 500. :)

[@MarcoS-mx1vj]

The way i learned it is to return 404 for the three cases 401, 403 and 404. With this you don't leak sensitive information. 500 would work as well of course, but seems to me a bit odd :)

[@IvanRandomDude]

Few tries with random username and any "hacker" with half brain will figure out that your 500 means 404 :)

[@shefeeqpm5413]

@ivan The intention is to lower the risk or not to mitigate :) If some one want to hack a system no status code can help :)

[@ghasemsadeghi5175]

You can use 400 (Bad Request) too if you are serious about 404

[@mdameenhasan6676]

Assalam mu alaikum brother, Can you please make video on Muslim Software Engineer Routine in Ramadan… eagerly wait for it😊. And yes love from India🫶🏻

[@diabawii]

Is the code you are explaining in the video is public, and where can i find it if it is ?

[@johnnychang3456]

Java 14? Never will have a chance to use it… pretty sure I will be stuck at java 8 forever lol.

[@thepetiteotaku]

For the leaking internals, if this is incorrect, what should a developer do instead?

[@danielthompson3082]

People've been telling me to check out DTOS ( Data Transfer Objects).. You can limit how much data the client receives from your endpoint

[@zafarboymurotov764]

Thank you very much good luck

[@KamelBerkani08]

How do you run controllers with IntelliJ ?

[@zezoms]

Great content. Keep going