Designing Microservices using Spring Boot, Spring Cloud, Eureka and Zuul | #2 | Tech Primers

This video covers an example implementation of Stock Price Viewer using Microservices Architecture using Spring Cloud, Spring Boot, Eureka, Zuul.
🔗Github Link for Code: github.com/TechPrimers/stock-...
🔗Part 1 Video link: • Designing Microservice...
📌 Related Playlist
================
🔗Spring Boot Primer - • Spring Boot Primer
🔗Spring Cloud Primer - • Spring Cloud Primer
🔗Spring Microservices Primer - • Spring Microservices P...
🔗Spring JPA Primer - • Spring JPA Primer
🔗Java 8 Streams - • Java 8 Streams
🔗Spring Security Primer - • Spring Security Primer
🔗Containers Primer - • Containers Primer
🔗Kubernetes Primer - • Kubernetes Primer
🔗AWS Primer - • AWS Primer
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🎬Video Editing: iMovie
🎼Background Music: Broke For Free - Day Bird
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#SpringCloud #Microservices #TechPrimers

[@GauravSharma-wb9se]

Dude.....You have cleared my all doubts almost by this series of videos on this application, I was struggling a lot from long to learn micro service complete flow end to end. Thanks for your great work...god bless you :)

[@TechPrimers]

Thanks Gaurav

[@dhanyakumargonageri4259]

@@TechPrimers Man nice explanation.

[@playtochat5917]

HI gaurav are u working on micro services now? i am strucked ann issue while calling the yahoo api for getting stock quotes. The problem is like when we are passing a quote like "GOOG" to get method of Yahoo finance i am getting index out of bound exception. i am not sure why it is happening.Could you please help me out?

[@sarojsahoo8763]

@@playtochat5917 Is this resolved ! Make a core java application and try getting stock object

[@playtochat5917]

@@sarojsahoo8763 it's been seven months ji. Any way thanks for the reply..it got resolved 😊. Now I want to learn react . Can u suggest me a good source?

[@anusaxena1621]

I was trying to find out a well explained video now I got it when I saw this one. Thanks for sharing wonderful information.

[@niftymiller6057]

Awesome ! :) and seriously rocking video. Just seeing part-1,2 of these videso clarified so much of my long pending doubts. keep up the good work.

[@Premkumar-ln7gt]

i have just started searching about microservices and i must say your the best i have ever seen .great videos..keep going .it really help full in understanding the technologies which we never work.

[@61Marsh]

I Have learnt a ton from this series! Thanks mate

[@ldyao]

excellent video! thank you so much for teaching me how to use spring cloud!

[@sachinghumbre7835]

Both videos are very nice. I think the way you are explaining is very good. What I liked most is that you are not only discussing particular topic but also dealing with exceptions occurring during execution. This way we learn quickly and confidently. Many thanks !!! Keep it up !!!

[@samiraghayarov6898]

Thanks a lot for all of your clear explanations which help people to improve their skills , great job!

[@krishnaiahkashaboina4207]

This is excellent and very help full. Thank you for your effort. You have give so much knowledge about Micro service

[@sivakumarchekuri]

Excellent!!!!! Thanks Tech Primary for nice demo

[@TechPrimers]

my pleasure siva. Glad that was useful

[@arjunasettymurahari2568]

This is best video on cloud and micro services .. nice explanation and live code as well. Awesome .. Thank you for your great effort.

[@knockjkeee]

Thank! This is the best in the open spaces of the site, the explanation is simple and clear Thank you!

[@sammyzim]

Thanks for this. Good crash course on micro services with excellent example architecture

[@TechPrimers]

Thanks Sam. Glad that was useful

[@swaprks]

This is the best tutorial I have gone through. Each and every flow is well explained. This is amazing work. If you can add the spring security login and registration module to it, that would be complete package.

[@upenderyarra2772]

Awesome demo , thanks to Tech Primers

[@TechPrimers]

Thanks Upender

[@steambassador]

Thank you! this tutorial is gold!

[@mallen8557]

Excellent explanation. Thanks!

[@vikasmessi]

Thanks a lot for the video. Really instructive. God bless!

[@amardeeppunekar5373]

This is really useful and interesting video, thanks a lot, good work.

[@Teluguboygaming245]

Good and Nice explanation to learn micro service complete flow end to end.Thanks for provide this with example.

[@ruchirpt]

Thank you for wonderful work.

[@jannu234]

You explained very nicely...... It cleared my all doubt Thanks a lot....

[@hareeshs4177]

good and explanatory. thanks for your efforts.

[@aniruddhavaidya6337]

Useful and informative.

[@AkarKyaw1]

Thanks for sharing. It is very helpful and easy to understand.

[@AmitSingh-vb6oj]

Tech Primers you did amazing job with this nicely explained tutorials. Best wishes cheers.

[@TechPrimers]

Thank you Amit

[@andrzejokon1517]

Great tutorial!

[@nithingn3567]

Thanks a lot.Fabulous job :)

[@selvibr394]

Very good info about microservice design

[@bhanusreeja3205]

Worthy video - Thanq :)

[@vinodguptamummidisetti7702]

Bro... Thanq so much... Now I clearly understood... How to work with microservices

[@malam3958]

Dude... you just did awesome!

[@TechPrimers]

Glad it's helpful

[@jayasudhakar4463]

Good explanation Bossss!!

[@aniruddhavaidya6337]

Very informative and useful

[@meenakshisundaram3231]

To be really honest: Initial mindset: 1. I wasn't interested about 1 hour video 2. I ran thru the comments that music is little problematic. After seeing both videos: 1. Wow. 1 and 1/2 hours went like a breeze with your cool way of doing things 2. Music was kept that interesting factor rolling on, what's next you would make us know. Great Tech Primer. Thank you 🙏💕

[@TechPrimers]

Thanks buddy. Glad it’s helpful

[@rajusakthitube]

Great work

[@Premkumar-ln7gt]

You are really awasome

[@anantht2701]

good demo mate 👍

[@TechPrimers]

+Ananth T thank you Ananth

[@jeeperscreepers7]

great video!

[@rahulgoti3864]

Thank You!!

[@DeepakPandey-ij3bz]

Thanks for the vedio. Very informative. Please upload vedio on transaction management in microservices showing 2 phase commit or sagas pattern.

[@dinakerdeshini1367]

Best video on Microservices on entire KZbin platform

[@TechPrimers]

Thanks Dinaker

[@karan6551]

Awesome 🔥❤️❤️❤️❤️

[@sbylk99]

The best tutorial of MS, solve most puzzles. Although I don't think your MS communication codes are efficient :)

[@neshant89]

very nice video tech primers.

[@TechPrimers]

+neshant sharma thanks neshant. Glad that was helpful

[@sathishraj1]

Great work of philantrophy ! Can you make live videos , so we can clear doubts online

[@igrai]

thank you!

[@bhaskergour]

great tutorial

[@songleishiyulin]

nice. short and systematic

[@TechPrimers]

+Lei Song thanks lei

[@vedprakashmishra7535]

Good job . Jut add security also it will be very helpful.

[@sonalkesarwani7234]

its a great tutorial covering all aspects. Just a constant issue that I have faced starting from its first part is that the audio moves on but the video doesn't catch up with it. I had to pause and start again from a previous second to match the video to its audio. Else its very well explained.

[@shubhangibansod3521]

Useful video....

[@ajitkumargiri87]

Thanks for these Informative videos. You have done a great job,it really helps me to understand the micro service and its implementation. Here if you can add the security for the REST service ,it will he great help?

[@srikanthbk5604]

This is very useful and thanks, kindly upload the same tutorial without back ground music it is very very disturbing especially the first video.

[@sudiptendupal7254]

Hi Tech Primer, let me complement you first by saying "both the videos you posted on Micro services were simply superb". I am an AWS Architect who is learning Spring Boot from your lectures. Can you help me in resolving few questions on a complex AWS architecture diagram? I am looking forward to integrating AWS API-Gateway REST services with Spring Boot.

[@sarojsahoo8763]

Also we need to add @CrossOrgin annotation on Stock Resource methods in order to access the resources from a different origin

[@kavithayadav2809]

I think the way you are explaining is very good.plz provide the microservices designpatterns also

[@TechPrimers]

Yes Kavitha. I have done few already. follow the Microservices playlist. I will be doing more in the coming weeks

[@sanjaymodha3751]

I have used yahoo finance api 3.14.0 version and added as a external dependency and then it works!

[@jeroenj7494]

hero!

[@rishirajsoni7262]

Thanks Tech primers, one of the best microservices video, given a clear picture.. I hve one doubt that hw to move this architecture on different environment i.e qc n uat

[@TechPrimers]

You can use profiles to control configurations n use CICD to deploy to the destination env

[@sangeethavariath3124]

Thank you. Finally got hold of something that I was looking for. Since its a two year old video, has anything changed w.r.t libraries etc. Would be great to know!

[@vijaykumarbrahma-routhu473]

Awesome tutorial buddy. It was very useful in understanding all the pieces involved. FYI... the yahooFinance API version mentioned in the tutorial was not working for me. When I changed it to 3.12.3 it worked for me.

[@mohanvamsi007]

Thanks, it works when changed to 3.12.3

[@yueranzhang2350]

Very great and clear tutorial! Thx for ur help. Just one little question: what is the difference between Eureka and Zuul? It seems like both of them all have the mapping between service name and their IP address, and they both works like DNS server

[@vckumarvk]

your videos are really awesome. Thank you very much. You made the developer life easy. Really appreciate your effort. Do you have any video on how to deploy microservices, eureka and hystrix in cloud foundry or docker ? I saw you deploying helloworld in cloud foundry. If possible please create a video. Thanks again. Keep up the good work.

[@vckumarvk]

I got it. I was able to deploy eureka server and client. But I was able to deploy only 2 apps due to memory issue. I would like to deploy at least 3, any idea how can we do it in free edition? Thank you.

[@TechPrimers]

Thanks Vins. Glad that was helpful.

[@TechPrimers]

I also had the same problem. Unfortunately, We cannot deploy more apps in the Trial Verion of PCF.

[@04nikunj]

Thank you for the video, one doubt why have you hardcoded url in zuul. Why cannot we use the application names as we did in the stock-service for using the db-service?

[@VRRM]

I had a question regarding hibernate. In any booking system If multiple users select the same seat. How to handle it in the backend so that only one user gets the seat

[@DigvijayBhakuni-1990]

Very Good Video Can you do authentication with Zuul

[@bhavishyasoni7491]

Nice video dear, can you please share how we can scale up the services by creating the multiple instances of the db-service and stock-service??

[@maclovesgeet]

Nice work. Thank you very much. Quick question on architecture. What is the purpose of separating Quote maintenance service and DB service. For me, it looked like a single domain providing Quote service with the persistence.

[@TechPrimers]

yes you are right. I wanted to show the service registry with this example, hence split it further

[@ancellitto]

Hi Ajay, thanks for this wonderful tutorial...it truly gave a holistic picture about microservices! BTW is running micro services that resource intensive? and what machine config would you recommend to check this out..I am currently using a virtual machine for all my personal development..do you think that would suffice?

[@TechPrimers]

Hi Ancel, very good question. Yes. It's bit resource intense since you will be running multiple JVMs. If you have a 8Gb VM let's say, it's more than enough to run 5 to 6 Microservices which hav 1gb memory each. However if you can stil manage with 512mb, its more than enough. I don't know how does it fair with AWS w.r.t cost. Also since these are Microservices you don't a single VM. Instead u can hav multiple VMs and can scale whenever you need them

[@GauravSharma-wb9se]

can you please make video on topic i.e. when to go for messaging queue(Kafka) and when we should go for direct call using rest template ?

[@anilnaidu4751]

hi bro one of the nice video you have done and how we apply security to Api Gateway could you please do one video

[@TechPrimers]

+anil naidu sure will do a video on securing microservicsa

[@neshant89]

tech primers please do a video on securing the microservices and gateway

[@playtochat5917]

Hi Ajay. I have watched the part 1 and its really really helpful in this part i am strucked an issue while calling the yahoo api for getting stock quotes. The problem is like when we are passing a quote like "GOOG" to get method of Yahoo finance i am getting index out of bound exception. i am not sure why it is happening.Could you please help me out?

[@cafeta]

+Tech Primers how do I register in Zuul the services when the ports are dynamically generated?

[@amitpadgaonkar8830]

Great video!!!. Music is really annoying though. Your presentations are great in themselves. There is no need for background music. It's really distracting

[@praveenkumarkodge8184]

Zuul configured with 8300 and 8301.. what is the use of it ???

[@sinanniyaziev5055]

Hi, great tutorial! Would I ask, how to auto-generate properties for zuul properties/configuration in .yml file. I think I saw this in the previous tutorial with the properties file.

[@TechPrimers]

It's a feature in IntelliJ called Live template. I have shown it in my IntelliJ shortcuts videos

[@polimet12345]

Hi I have a question. If UI hits Gateway to microservice directly (stock Service or dB service) and from here if they lookup in Eureka service discovery for communication between Microservices then what is the point if particular micro service is down or not available or port changed then gate way ips of service has to be changed and redeploy ? I believe api gateway should hit or interact with Eureka service discovery for look up micro service rite ? Please advise

[@SrikarReddyAc]

Nice video. Can we fire up multiple instances of Stock Service? so that when one service is down or there is too much load then the other will respond. If so, Is there an additional configuration that needs to be setup? What is the optimal way of handling the situation instead of sending error messages to the user?

[@TechPrimers]

Yes. You need to use Ribbon for load balancing in that case. Yes. there is additional config. For the error handling, you can use Hystrix and return empty response or something similar to make sure error is not propagated to the user

[@HossamKandil]

Very helpful, question: should we add the services to zuul config , or should it be discovered from Eureka server ?!

[@TechPrimers]

The new notion is using Eureka Server to perform auto discovery

[@josimaramilcarjafa]

amazing videos is missing just security between microservices

[@mobinshah1]

Zuul Proxy has been forwarded to maintenance... which means that it will probably be discontinued at some point.

[@susmithapuppala3599]

which zuul version do we need to add for spring boot 2.4.5 ?

[@abhishekramkrishna9448]

The video didn't show to detect service with Eureka service. TheDB service URL is still hardcoded.

[@muralik5504]

Nice tutorial, but I was taken so many pauses to make it on my system.

[@Apurvk]

Hey Ajay, Thanx for the effort. Quick question: How do we go about deploying all these on AWS ? like on EC2 ?

[@TechPrimers]

there are different ways to do it. AWS CodeDeploy helps in pushing these to EC2.

[@Apurvk]

would you be making a youtube video regarding the same?

[@TechPrimers]

my latest video shows how to deploy spring boot app manually to EC2. I'm learning AWSCodeDeploy. Will do once i get comfortable with it

[@smithdragon6477]

watched Marked

[@ohhhgggeeezzz]

Could you please explain why we need Eureka server / clients? Because zuul proxy settings we already defined the routes path: /db-service/** url: localhost:8300 So without Eureka if we hit our REST endpoint like so http:localhost:8302/db-service/rest/db/{name} would zuul still successfully reach the endpoint?

[@ohhhgggeeezzz]

In spring boot 2 Is anyone getting com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused (Connection refused)? Both db-service and stock-service is working in eureka dashboard but I get this connection refused like ever 2 minutes..

[@balrajmys]

Awesome demo :) I'm working in spring boot web project calling third party server and pushing orders created from our UI calling the api access. But my concern is I'm pushing 100 orders at a time when it's pushing api server may go down and order creation may stop in between. So I want to push all orders into somewhere and pushing each item to api server. When it's down still orders will be in cache offline and when server is up it has to take orders from the cache instead user uploading from the beginning. Pls suggest

[@TechPrimers]

+balraj s you can use JMS queue to solve that problem. Check my video on ActiveMq. It's a queue implementation. Messages are stored inside the queue. So that even if the process guess down the messages will be in the active mq topic

[@balrajmys]

Thanks a lot I'll go through ur videos on that and let you know for any help :)

[@TechPrimers]

+balraj s I have answered your question here: kzbin.info/www/bejne/Y3zSYWuJg9OtbNE

[@hi1983ja]

Thanks for such a informative video. I have question. Is there any way we can determine whether zuul is hitting appropriate service. It would be helpful if you could provide code snippet or a way to achieve this. Thanks

[@TechPrimers]

nope. zuuls primary job is to act as a gateway/proxy. so i dont think its required

[@hi1983ja]

thanks for reply, so in this case how we can determine without executing end to end test that gateway is redirecting the request to proper services.

[@ashishkathait6783]

One question.... can we create a separate microservice for ZUUL at some other port, with its own yml file and integerate it with EUREKA server registry ?? that will decouple the EUREKA and ZUUL

[@TechPrimers]

+Ashish Kathait yes. That's the idea. My laptop didn't have enough memory to run them separately. Hence i had merged them together

[@ashishkathait6783]

Thanks Tech Primers... This was an awesome tutorial and the best part was you were doing it live. Have one more question. how to do Transaction Management in microservice environment. you explained about hystrix and that is to avoid sending the exception to front end. So is there other technology for Microservice transaction management ? ?

[@smishra2128]

Trying the microservice design on H2 internal Database , getting an error which is taking hours to resolve : com.sun.jersey.api.client.ClientHandlerException: org.apache.http.conn.ConnectTimeoutException: Connect to localhost:8761 timed out at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1] at com.netflix.eureka.cluster.DynamicGZIPContentEncodingFilter.handle(DynamicGZIPContentEncodingFilter.java:48) ~[eureka-core-1.6.2.jar:1.6.2] The Eureka server looks good at 8302 , however when I start the DB service I get this error - is there a way to resolve this ? Application Properties in DB service : spring.application.name=db-service #server.port=8300 [[this is commented as it throws error][ spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_ON_EXIT=FALSE spring.h2.console.enabled=true spring.h2.console.path=/h2console spring.datasource.username=sa spring.datasource.password= spring.datasource.driverClassName=org.h2.Driver spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.H2Dialect

[@harichan444]

what is need of proxy server here i.e zuul..and we are doing same as we for rest service registration and publishing it and rest client will access it using url. what exactly microservice providing additionally...i am confused with microservice and rest service

[@TechPrimers]

+harish vs if there are 100 Microservices (every Microservice will be in different port/host) URL will be different and the accessing server will have use know what's the URL for every service they use. Proxy server abstracts that. Micro service uses REST to communicate with each other. Every micro service is nothing but a process or a JVM

[@shubhangibansod3521]

While calling stockprice service yahoo Finance api is throwing string index out of bound exception.. Plz help with this

[@asimah3959]

I'm getting the following error when trying to run eureka-service. Help is highly appreciated! Error starting Tomcat context. Exception: org.springframework.beans.factory.UnsatisfiedDependencyException. Message: Error creating bean with name 'org.springframework.cloud.netflix.zuul.ZuulProxyAutoConfiguration': Unsatisfied dependency expressed through field 'zuulProperties'; nested exception is org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'zuul-org.springframework.cloud.netflix.zuul.filters.ZuulProperties': Could not bind properties to 'ZuulProperties' : prefix=zuul, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'zuul.routes' to java.util.Map 2019-01-10 16:48:28.282 INFO 53629 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2019-01-10 16:48:28.287 WARN 53629 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat 2019-01-10 16:48:28.299 INFO 53629 --- [ main] ConditionEvaluationReportLoggingListener :

[@willyastore]

a lil help?? after fixing StockResource and using @LoadBalanced at Config, when i hit: localhost:8082/rest/stock/Samson, i got: "I/O error on GET request for \"db-service/rest/db/Samson\": Connection reset; nested exception is java.net.SocketException: Connection reset",

[@manishjs19]

Hi Ajay. Currently i am only running db-service and eureka service discovery and accessing db-service thru postman by hitting load balance URL (localhost:8302/api/db-service/rest/db/add) & it works. But If I create multiple instance of db-service (2 instance with different ports) how can i make sure the request is load balanced between 2 instances of db-service. I tried to give comma separated value for list of urls in zuul route url property but that didn't worked. . Can you please advise on how to load balancing only this?

[@RishiRaj-ff3sd]

How to make setting to make IntelliJ IDEA keyboard shortcut suggestion popups appear automatically, as these are visible in your video?

[@TechPrimers]

Hi Rishi, its Presentation Assist plugin. I have shown about it here in the IntelliJ Tricks I use video - kzbin.info/www/bejne/oarcaayhociHncU

[@singhrudrajeet7]

Hey, I have created the complete application but from YahooFinanceAPI the response are coming null. I have used the same version as mentioned in the video. Inside the YahooFinance class, there is getQuotes() - where we have StockQuotesRequest request = new StockQuotesRequest(query);. then List quotes = request.getResult();. Here the request don't generate getResult().. And I'm getting timeout exception. Please help

[@shubhammahajan1178]

Hi team, first of all..thank you all for these great videos. I'm starting with these technologies using your videos only. But I am having a problem in service registration here. Services are being registered and visible in the Eureka Dashboard, but i am not able to access db-service using it's application name. It's giving me the UnknownHostException: db-service

[@TechPrimers]

Hi Shubham, please check how you are creating the RestTemplate. It needs to be auto-wired rather than new RestTemplate(). If you autowire SpringBoot will take care of replacing the db-service name with the relevant host and routes it

[@shubhammahajan1178]

I did autowired the template as you did... but not working...is there a way to communicate in slack???

[@shubhammahajan1178]

this is the exception that i'm getting: ResourceAccessException: I/O error on GET request for "db-service/rest/db/shubham": db-service; java.net.UnknownHostException: db-service But when i use the localhost:8089 (port of db-service) in StockResource class, everything is working then..please help...