Spring Boot + Spring Security + JWT from scratch - Java Brains

[@Java.Brains]

Important note: In the video, I provide the JWT secret as a constant variable in the Java class. As you might imagine, please don't do that in a real application! It's not a good idea to check in passwords / secret keys in your code. You should get that from a setting / property file that's in a more secure location and not in your source code repository. (Thanks to Olivier for pointing this out in the comments)

[@sohel_naikawadi]

Thanks for the tutorial. You have some unnecessary lines in your code. in Jwtrequestfilter.class--->if "&& SecurityContextHolder.getContext().getAuthentication() == null" is useless as well as "usernamePasswordAuthenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));" has no use as we are not using session.

[@abhishaysrivastava6518]

AuthenticationManager bean already defined in config class. But still getting error

[@satyajitm93]

If spring security itself can do authorisation, then what JWT is doing ? Is JWT used to make application more secure ?

[@satyajitm93]

Priyak Dey Thank you so much .

[@fazilkhan4085]

Why are you requesting using header Authorization Bearer... As you are using shared secret key, should u use Authorization Basic

[@syednoman84]

I really want to meet and look at those people in their eyes who actually dislike this and other videos in this playlist. It is a real work that it teaches you for free and with a quality material. If you cannot like a video, the least you should do is to not dislike. It is basically you who might be missing the pre-requisites to understand the material used in these videos but nothing wrong with this quality playlist. I have learned a lot of stuff from these awesome examples. Excellent show Koushik (y)

[@vikingofengland]

Totally agree, but that is the internet for you!

[@harrywright799]

Much love and respect

[@yousufbaig821]

Very well said !!

[@akankshasinha3352]

Till the addition of the jwt filter everything is fine and the JWT is also getting generated but after injecting the jwt filter in the securityconfigurer class I’m getting the exception “JWT string can’t be empty” . Unable to resolve this even after googling. If anyone can help then please .

[@igorzuber1604]

The tutorial covers Spring Boot security pretty nicely, but I think there are some aspects to be pointed out here: - Some people wonder where the token itself is validated. This was not mentioned in the tutorial, but actually the *extractAllClaims* method is responsible for the validation. It throws exception while parsing claims if token signature is invalid (secret key mismatch) or token is expired. Thus *validate* method in JwtUtils has redundant check of expiration time. - The great advantage of JWT is that it is stateless, that means id doesn't have to be validated against queried data. This tutorial validates if data of user with provided userId matches the data of the same user fetched from somewhere else (usually from a database). This validation is redundant, since token has already been validated and we are ensured that provided userId is correct. There may be a need of fetching user while validating JWT token, but there is not in this scenario. - To sum up - *validate* method in JwtUtils can be securely removed

[@tianyuli3015]

omg thank you so much, sir. I have been scratching my hair off after watching the tutorial. I felt that the extract method already validate the signature, and that validateToken method will basically always return true, because the userDetail was fetched by the very same username extracted from the token, which means either no userDetail can be fetched or the username has to equal.

[@amitsharma9377]

One more thing is that the validation filter is always fetching the user details from database, which is not needed since that is the purpose of JWT payload. As of now there is a DB call to get user information for each incoming request which defeats the purpose of JWT tokens.

[@harshaanirudh5787]

Validation of jwt is required as jwt payload can be changed ,such as changing expiration and sending it. As it is simple base64 encoded . If any tampering of jwt occurs it will be verified with the signature. So the validation is required

[@igorzuber1604]

@@harshaanirudh5787 It is required, but extractAllClaims method already does that. So if payload is tampered, the signature won't match and extractAllClaims will throw expection.

[@harshaanirudh5787]

@@igorzuber1604 yeah, just realised it. Thank you. And if you are aware about refresh token implementation , could you please suggest any?

[@dineshchandgr]

An Amazing video with 40 minutes of content. Best thing is how Koushik keeps the tempo throughout and keeps motivating. He holds on to the audience and such an amazing teacher and a humble human being. God bless

[@ManishChoudhary-nr2tf]

Who says Spring Security is complex to understand, we have such a great instructor like you Thank you so much

[@haodeng9639]

With a good tutor, I feel like Spring security is Hello world level framework.

[@SaratchandraKasivajjala]

Note the changes in the HelloResource class at 8:10 . 1) "RestController" instead of "Controller" and 2) Remove the flowery braces from the "RequestMapping"

[@mahdyberriri5742]

That's just Spring MVC stuff and has nothing to do with Spring Security. People coming here are mostly familiar with Spring MVC so that shouldn't be a big of a deal.

[@SaratchandraKasivajjala]

@@mahdyberriri5742 I was helping out people who might be copying the code word for word.

[@mahdyberriri5742]

​@@SaratchandraKasivajjala ah understood! that's kind of you man.

[@winsongoh8300]

Thanks! Help solved my problem where cannot access the /hello path

[@sajiths8678]

Thanks.. This resolves 'resource not found' error..

[@robertinnoelson6378]

I love that guy saying that if he gets married, he will invite you. I've realised that you have helped millions, if not billions of devs out there! Keep going big bro

[@hyperborean72]

Millions? Billions? you evidently like large numbers

[@AlmightyGauss]

My man, you're like the Saint Nick of Java! Thank you so much for sharing such great content

[@safiullahzuri7685]

the world needs more teachers like you. thank you!

[@pabloleyes5574]

I tried to learn SpringSecurity for at least five months, and finally I gave up and used JWT manually for my personal application. But you expained it perfectly and now I can implement both techs! Thank you, very much!

[@liammullan2197]

Your style and delivery is excellent, you are making a lot of java devs' lives better!

[@Veronica-vq5iz]

Omg Kaushik.. you are a saviour.. I have followed your microservices series when I was asked to make a poc on that.. where I learnt a lot of new concepts from you. And now again I am asked to make a poc on Jwt and again you have made it so simple to understand and implement as well. Thank you so much. You are a trusted resource for me.

[@valkon_]

If I get married , I will invite you because I feel you like a family after all these years.

[@_robyn_]

*When

[@valkon_]

@@_robyn_ Yeah..I am not sure about that

[@_robyn_]

@@valkon_ 😂😂 feels for u bro

[@codingworld6762]

you got married??

[@jespercavaglialarsson2557]

are you married bro??

[@alejandrogandara33]

I have seen many tutorial videos but this is the clearest, most useful and most educational I have seen, I thank you very much for your time.

[@samir105yt]

Koushik, you are the best instructor! I've been postponed jwt auth implementation in our project waiting for your video about it before implementing. Thanks a lot!

[@georgekibira3231]

I cant Thank You enough for what you have done in my career through your tutorials . You explain everything in simple terms and great enthusiasm. THANK YOU!. Its the best content I have seen in the internet. And some ungrateful idiots will just downvote the videos.

[@isaacbarron5738]

OMG, you're an OG for this. I've been waiting for someone to explain this for over a year!!!

[@catchsaurabhonline]

Simply one of the best videos on Spring Security + JWT

[@bluesky_10]

i drop out from collage and when i watch tutorials like yours, i feel proud of what i did

[@MarimuthuP]

Simple and clean explanation. The code just works fine. Thanks a lot @Java Brains. You are my goto person when i want to learn "how things work" not just "how to work". Thank you and Congratulations.

[@shashikanthc6400]

What a nice Diwali gift. So thoughtful of you man!! Happy Diwali y'all!

[@KABABOS1]

I haven't used Java in a while. Started a project to refresh Spring's Authenticatoin& Authorization. Then you post this video. Thank you for the great content! =)

[@hyperborean72]

19:05 I believe that in SpringBoot @RequestMapping can be replaced with @PostMapping so that we do need neither 'method' attribute nor to annotate the argument with @RequestBody

[@tejeswarpala2841]

this video is about spring security and JWT authorization.

[@martinezjosei]

Great explanation! Clearly explained, no fast talking like others (Telusko) and no (Indian) accent!

[@shashanksharma15]

Any tutorial with angular and spring boot

[@alanhunt3772]

Holy heck that is a lot of work, but I suppose that's just what it takes to secure an application. I'm a junior developer with zero experience in security and authentication/authorization but this video is a great start to implement what seems to be some basic security measures. Thank you for posting!

[@baidyanathpanda1964]

Just before watching I clicked like button

[@sreesri8492]

Me too

[@NikhilLimaye10]

I'm waiting for it too!

[@AkashMulik7]

Great tutorial Kaushik.. Perfect. Viewers, If you have basic knowledge of spring security, you will fully understand it.

[@cochi2221]

Thank you so much! What about a JWT + OAUTH2 tutorial?

[@williamardianto943]

JWT + OAUTH2 tutorial Please........

[@Niceguy54444]

You need new instance for oauth

[@Limitx1]

www.baeldung.com/spring-security-oauth-jwt

[@francisojunior2671]

At first I watched this video and I hated it. After seeing the others, the video about concepts, JPA and etc... now it makes total sense to me. My advice to others is that you watch all the other related videos.

[@omarbadr621]

That was clear, understandable, and easy to follow. Thank you very much.

[@GhoomoIndiawithAlok]

very nicely explained JWT and spring security which is not easy to understand by reading. Hats off to Kaushik for preparing such a great video

[@zahidsayil9066]

First time watched complete jwt configuration. Thanks. Make some videos on Spring batch

[@mdk1983]

Thanks a lot sir, you benefit millions, even though there are only 4.7K views for this video, each one of them would have adopted this topic to write code for so many customers!!

[@ymfeijo]

Another amazing class from this channel! But I got deeply concerned about the future of Java going this way. I've just learned to do the same via Python, and it was far more simple.

[@mahdyberriri5742]

Java is still far more robust and faster than Python in general; and specifically for server-side web development, Java shines bright (especially with Spring). Python simplicity comes with the cost of bad performance unfortunately.

[@anthonytumwesigye8652]

You are definately right about that....java for hard boiled devs.

[@akankshasinha3352]

Till the addition of the jwt filter everything is fine and the JWT is also getting generated but after injecting the jwt filter in the securityconfigurer class I’m getting the exception “JWT string can’t be empty” . Unable to resolve this even after googling. If anyone can help then please .

[@giteshgreat]

Excellent video. Im working on LDAP integration along with JWT. This is the best tutorial that got my thing working. Thanks

[@SouravendraKrishnaDeb]

Any Spring + React tutorial? Love your videos man. Extremely helpful!

[@joejones5746]

Java brains simply rocks - thanks Koushik for this video. Been following Java brains for almost 5 years now and the way you explain is outstanding compared to most tutorials out there !!

[@Abhi_k007]

In HelloResource controller , you have changed the controller type from Spring streotype controller to RestController all of a sudden, Which could leads to confusion for beginners, Since @Controller will try to return a view which doesn't exist, and you haven't used @ResponseBody along with Controller to support a simple text as response. Maintain same coding across the video, if you have made correction point it out.

[@kilexdesh5051]

This tutorial is the best I have come across on the internet on spring security. You did a fantastic explanation. Thanks man!

[@tobioye88]

Please OAuth2 next. I love your teachings

[@dhirajparakh8742]

Thanks for this tutorial without wasting a single second make this tutorial understandable.

[@SurendraBabuK]

It's really impressive. Could you please do videos on OAuth2 + JWT. So that it will be complete tutorial on security. Waiting for new videos on OAuth2 at least 3 videos.

[@GurpreetSingh-mb1ft]

Great fan of yours, when I get some work on technology which is new to me . I simply first check the tutorials on Java Brains .Thanks for your effort sir.

[@stephyjacob1256]

Thank you.. waited for last few weeks.

[@alvaroenriquerinconesalfar4102]

Compa no le entendí nada porque no se inglés, pero déjeme decirle que su video fue el mejor de todos, fue exactamente lo que necesitaba y gracias a usted pude terminar la aplicación que me encargaron. Felicidades por esos videos.

[@wardg4916]

Thank you very much for your awersome videos, but I have something to say In previus videos you said JWT token is used so we do not need database to validate them, incase of microservices..etc also in JWT Filter in this step I think loading the user details from database is not neccesery.. UserDetails userDetails = authService.loadUserByUsername(email); if (jwtUtil.validateToken(jwt, userDetails)) { We can validate the JWT using the signature only, and thats enough right? also we can add other user details to the claims and retrive them, in case I do not want to use DB to validate JWT but I want more details about the user. Please correct me If I'm wrong Thank you

[@win.ngo.55]

Yes, whenever "Jwts.parser().setSigningKey(jwtSecret).parseClaimsJws(authToken);" is called, the token is validated internally (you can see some exceptions are declared in the method signature). So I think this is enough to validate a token: public boolean validateToken(String token) { try { Jwts.parser().setSigningKey(secretKey).parseClaimsJws(token); return true; } catch (JwtException | IllegalArgumentException e) { // handle } } Moreover, UNLESS you want every request to have newest/realtime data from the DB (e.g: role change, active/inactive...), you can build the Authentication object based on the token itself and pass it to SecurityContextHolder.getContext().setAuthentication() so that you can avoid querying to DB (i.e calling loadUserByUsername()). Reference: stackoverflow.com/questions/50572339/jwt-authentication-without-fetching-user-details-on-each-request

[@4medonly688]

Perfect explanation like all previous videos in this topic. Appreciate a lot!

[@mohamedhakkeem5414]

Hi Java Brain, 1)In real time project what kind of signature algorithm would be used. 2)In real time project generally how much time they will set for token expiry? 3)So all these JWT configuration and setting are likely one time activity? Also I would like receive reply on this from any helpers who is working in real time projects.

[@thiagofelippi5969]

Very very very thank you, i'm trying do this for 2 days and now work. Now i will study about jwt methods on java because i'm coming from Javascript and some choices are different, but thank you man!

[@smaug9833]

peculiar thing I noticed: if you create jwt with just the userName, it will introduce a vulnerability. When a single account has been logged into from two clients, if one of them changes his password, the other client's jwt will still be valid until he logs out. To invalidate the other client's jwt right away, create the jwt with both the userName and password, like: userName_password.

[@maxfeldman6654]

Thank you , the world needs more awesome people like you.

[@OLApplin]

Please, for those who watch this, you must make sure to not hard code any sensitive information (like passwords, or private key) in your code. This is a very dangerous practice and a vulnerabilitym even more if you use Git and commit code (even if you erase hard coded infos, it is always possible to go back and find it with Git). The use of environment variables is one of the solution to solve the problem.

[@Java.Brains]

Thanks for the comment. I realize this might mislead someone who doesn't know. I'll add a pinned comment

[@OLApplin]

@@Java.Brains Hi ! I forgot to mention "Great video as usual" in my previous comment ;) . Yeah, It's pretty obvious for someone who has a little bit of professional experience that it is not a good practice, but as this video is a tutorial, and is somewhat intended for a less experienced audience (I suppose) , I thought the security warning was important to make.

[@84prabhumishra]

One of the best SPRING+JWT material on internet..

[@Constantine..]

Hi) What about refresh token? Why no body explain this topic?

[@robertinnoelson6378]

Isn't that more easier than anything in this world now? ;)

[@lowtech1479]

The refresh token is the same. You have to create a new endpoint with GET method to handle that task. But we need to validate the current token, before process the refreshing request. And the most important thing to be noticed in case of when user changes his/her password before the refreshing request is sent to server.

[@indranilgoswami1500]

Your teaching style is outstanding sir ...Amazing. Thanks a lot.

[@dvt32]

Thanks for the video! Just FYI: Your LDAP Spring Security video is missing from your Spring Security Basics playlist. ;)

[@Java.Brains]

Thanks for the call out. Added.

[@tortue34170]

Thanks man ! Really good content here. I've been reading comments below and maybe there are important info missing, but trust me this is gold. So many videos out there which don't get to the point, are sooooo long, let you with not working code, or are just baits for going purshase a full tutorial on private websites... This topic is pretty hard (at least for me) and this short video leads you to a basic working jwt springboot app ! I Guess there is more to do for a professional app, but this is a good start. I definitely will go through you channel to see if there is more about it !

[@AdrianVrabie]

just wanted to say Thank you :) Great job! But, it's not clear about where SecurityContext appeared from at the end in the filter :)

[@balajivaradharajan5573]

Thank you, thank yo, thank you.... I wished I had a teacher like you for all my technical courses... You are so awesome in explaining the concepts and following up with an example....

[@aminembh6094]

Really nice video, I am just confused about something; what's the point of implementing the JWT since Spring Security already handles the authorization mechanism? Anybody have an idea here?

[@aminembh6094]

Now I get it! it's a matter of stateless vs stateful mechanisms ;) It does make sense! Thanks for the explanations and for your time Sir!

[@go_better]

Thank you. It was a little hassle since a couple of libraries are updated. But anyway, I managed to make it work. Thanks to you! It brings joy to complete tasks.

[@utkarshgupta8061]

Hello, thanks for such a wonderful tutorial! Facing an doubt though. When I'm trying to generate a JWT token by POST request to /authenticate, keeping the password correct and fiddling with the username, I'm still able to generate a JWT token. It's not authenticating in the correct manner against the user in MyUserDetailsService. Any idea where it might be wrong?

[@Java.Brains]

Try setting a breakpoint in your API method and see if you have incorrect logic. It's hard to tell without looking at the code

[@rikijha638]

@@Java.Brains It's happening in your code too that is uploaded on git maybe the cause is you have created a static user which get created irrespective of username provided in loadUserByUsername(String username). It should be something like this public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException { if(username.equals("foo")) return new User("foo","foo",new ArrayList()); return null; }

[@himanshitaneja1254]

I am also having the same issue. Could you please help me

[@quickbitesitsme]

@@rikijha638 or for better clarity, let us have a map 1) foouser -> foouser'spassword 2) baruser -> baruser'spassword and get the password from the map for the username and return an "User" object.

[@almukhametovar]

Best explanation. Shortest code. Great! Thanks a lot!

[@nicoapinedo]

Awesome, this tutorial was super helpful, could you please create a new one with JWT + LDAP? I've been trying to find good resources about that combination but there isn't anything with the quality your videos have. Thanks!

[@rajeshhazari]

Aren't JWT and LDAP will be sperate realm/filter in spring security? Was looking into this , and also will have basic auth as default.

[@yousufbaig821]

Once again thanks Kaushik for yet another AWESOME video.

[@d34l_breaker]

Hello ! Good video. Can you show some code in the next videos for refresh access token flow and returning status code 401 if token is expired (i need it for an android client with retrofit authenticator) Thank you.

[@balanepalaiyathane9714]

Kaushik, Is always gem and proved that he is the best one to help both freshers and experienced ppl to understand the concepts. Your videos saves more time and easy to remember , you are a nice person GOD bless you

[@Shl0kk]

Nice work ... but, ew. I would have expected Spring Boot's implementation to be a whole lot cleaner than that

[@UdayKumar-xq1ve]

Boot implementation is 1000 times cleaner and clearer than normal JWT with Spring Framework

[@weraponpat1913]

I'm struggling with this authentication about 2 weeks and this video is really helpful thanks a lot

[@manuelcarbajal7610]

WoooW. Man, I neve understand Spring Security Framework, but with your explanation I finally got it!. I'm really thanked with you! :D.

[@thienquangphan7195]

It's a very good sample for the beginner. It's not too much but can show a brief description of the way Spring Security and JWT work with each other. Viewers need to watch slowly and take note of important points: - Security configuration - Adding and registry new filter among Spring Security filters that are provided by Spring Security - SessionCreationPolicy - Implementing UserDetailsService service - SecurityContextHolder, this manages authentication object that operates throughout security validation process

[@HarishKumar-vz4if]

Thanks sir, It's really very worth to watch complete video. Thanks for helping us over the years & years. Please keep posting such an outstanding videos for us.

[@andrealzamoradeza9400]

Hello Java Brains, Nice Tutorial, I already implemented one real application with spring security and jwt but with this video I finally understand the background of it.

[@greentorainchannel386]

Perfect video on JWT token with spring security 👍👍👍👍👍👍

[@BudMan82]

You rock. Thanks a ton for making these videos available. Honestly the instruction is better than some of the Udemy courses that I've purchased in the past.

[@akankshasinha3352]

Till the addition of the jwt filter everything is fine and the JWT is also getting generated but after injecting the jwt filter in the securityconfigurer class I’m getting the exception “JWT string can’t be empty” . Unable to resolve this even after googling. If anyone can help then please .

[@kounouzhlimi6932]

you are a gift from god, you make spring security soooo pretty, thank you 🙏

[@abdulrahmanhashem6260]

There is only one case that should be handled which is if someone misplayed with token and send it to the server, the server reports an exception. So only wrap doFilterInternal body with "try-catch" statement and continue the filter chain in catch clause. Thanks for this tutorial, amazing!

[@adarshverma3372]

First of all excellent explanation by Koushik but to those who didn't understand the concept of extractClaim() method extractCliam() methods takes a functional interface function as an argument which is of type (Represents a function that accepts one argument and produces a result.) so from the extractUsername() method we are calling the extractClaim(token, Claims::getSubject()); // done using tthe mehtod reference(Done as in calling the static methods) as the second argument can be wriiten as (Claims)-> Calims.getusername() as we are saying the claimsResolver that it goona recieves an object of type Claims and from that object it needs to get the string which is Claims.getUsername() same is done using extractExpiration()

[@nadeemqureshi9779]

For some videos YT must introduce a Love button. This video would get the most 'Love' when that happens.

[@wanke9837]

I really thank you ! previously I have no idea about Spring Security now, I got what I need. I will advance it from now

[@yonmoyonmo]

Best Spring Security teacher ever!!!!!

[@rajaramsavant4384]

It was very helpful to understand the authentication/filters part in spring boot. Thank you so much for sharing this! 👍

[@rahulPatil-gy8ex]

This is awosome ..... clear explanation and demonstration Thank you so much

[@baismail-daily]

Masha Allah nice voice and awesome gift in explaining stuff in simple words. Thanks a lot

[@drawlzlolwlz5953]

Finished the Tutorial! Great job man

[@suryaprakashnayak7263]

Great koushik. Really great. Awesome teaching. Thx From deepest of my heart.

[@sharathkumarIndian]

Thank you so much!!! It is a great tutorial for the one who want to understand how jwt works with Spring Security.

[@suren9198]

Awesome explanation of SpringBoot security, Thank you sir 🙇

[@shaunchennai]

When disliking such video, please explain why. Coz I don't see a point in disliking such video. Thanks Kaushik for these. Appreciate it.!

[@graphikcreativezone]

Whaooo. This is very helpful. Thank you Sir !! Very well explained !

[@shaswatdasgupta3776]

Thanks Kaushik ! Thanks a lot for making jwt simple for us .Happy Deepawali :)

[@thirue8237]

You are a great tutor. Thank you so much for the nice content!!

[@liferayasif9382]

Great tutorial, simple, in details, I really love your way of explanation and without any error. Thank you so much

[@danielgalvis8568]

What a great tutorial, easy to follow but, what is more important, really clear, and clarifying. It would be great to see an example with at least 1 role, but anyway it was really helpful. Thanks!

[@anupriya6144]

You made my life easy with this explanation.

[@wilfredomendez3450]

Just exactly what I was waiting for, thanks for sharing.

[@AminHasan85]

Great video as always. Looking forward to OAuth. Your efforts are highly appreciated,

[@alihatami3303]

best Java teacher EVER !!!!!!

[@thejose24]

Finally one that's very clear. Thank you.