What does SagaGateway do?. Failures can be handled easily by identifying the service which is causing the failure. Spring Cloud Data Flow (SCDF) supports microservice-based Streaming and Batch data processing for Cloud Foundry and Kubernetes. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Find centralized, trusted content and collaborate around the technologies you use most. Learn more. Our mission is to bring the invaluable knowledge and experiences of experts from all over the world to the novice. How to implement security in between modules? These services have routing like traditional Unix pipes thorough endpoints for information flow. An Activity is a function that executes a single, well-defined action (either short or long-running), such as calling another service, transcoding a media file, or transforming data. Suppose there are 5 Micro-Services, lets say M1, M2, M3, M3, M4 and M5. Rating: 4.5 out of 54.5 (75 ratings) 6,611 students. Below is the code of PaymentWorker that executes DebitPaymentActivity. . There is no orchestration among other services. As new requirements come in and complexity grows, you see the need for microservices. Yes, it is ORDER CREATED. config-service - a module that uses Spring Cloud Config Server for running configuration server in the native mode. Open up a command prompt and run java -jar target/spring-boot-microservices-0.0.1-SNAPSHOT.jar web. Below are additional source files required to run the Subtraction Server. We would register ourself when we are running multiple discory servers. The Saga architecture pattern provides transaction management using a sequence of local transactions. rev2023.2.28.43265. Connect and share knowledge within a single location that is structured and easy to search. Learn how your comment data is processed. Microservices architecture based applications can be developed by using Spring Boot. The client SDKs are available in many languages including Go, Java, Python, PHP, and TypeScript. I accomplished this by using the RestTemplate in Spring. Created by John Thompson 470,000+ Enrollments Worldwide, Spring Ahead Code Academy. Could you please double check? Secondly, use prototype bean when Workflow is registered with the Worker using the Factory method. In Temporal, you can define workflow steps in code using constructs of language-specific client SDK. This is bean realization to send events to Saga instance and run it. Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? As an easy approach, use eureka to get a microservice by name (application-name) and query it in another microservice logic layer. Microservices - also known as the microservice architecture - is an architectural style that structures an application as a collection of loosely coupled services, which implement business capabilities. Temporal UI provides some important detail about the Workflow and Activities execution. elaborate. Also, we will not cover any failure and compensation scenarios. For this I used the Controller Advice exception handling in Spring. Simple Transaction Handling: They usually use a single database for the whole . In the monolithic approach, all the smaller systems are bunched up to make up one large system or one large appplication. I tried. If you check the screenshots, order-service always keeps the order in pending status first as soon as it gets a request. https://github.com/eventuate-tram/eventuate-tram-sagas-examples-customers-and-orders. Activities and Workers can be created as default singleton Spring Bean. Functional tests for each service will be helpful for overall integration testing of the microservices application. This was the subject of an earlier post by me, Developing Event Driven Microservices With (Almost) No Code. Here's a full list of available examples: In the most cases you need to have Maven and JDK8+. This could seriously affect the user . Nice article. what is best way to orchestrate micro services in spring boot. It will listen on port 3333. The doAdd method handles requests made on /add. In this article, we will be discussing the Orchestration based saga. Our sample architecture will be more or less like this.! Yes. Mar 10, 2020: Updated to use Spring Boot 2.2.5 and Spring Cloud Hoxton SR3. It is easy to commit / rollback when everything is in a single DB. Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? I am just curious about how do you perform the testing for streaming application using Kafka. For more information about loggers, and setting properties for loggers, you can check the below links-. Execute mvn clean package to create the fat jar. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? Choreography approach. Every service in a saga-pattern plays out its transaction and distributes an event. Must is declaration one time in the saga class. When a client application submits the Workflow to the Temporal Server, it becomes the responsibility of the Temporal Server to execute the Workflow and all Activities associated with the Workflow in the appropriate Worker. Declaration @EnableSagaOrchestration microservice in the starter app class. Spring Boot, in combination with Spring Web MVC (also called Spring REST) makes it easy to develop RESTful web services. The following example shows how container orchestration can help manage cluster deployment, networking, and scaling. It can feel daunting to build a new microservice. to use Codespaces. The only difference is the configuration. Although microservices communicate predominantly via APIs, there are cases where communicating via event notifications is a good fit. The orchestraor service is the one which coordinates all the activities and decides it can be fulfilled or cancelled. Create a Docker image with the application jar. The bad thing is that if they are microservices, you finally pack them in a single jar, contradicting the nature of the microservices because it becomes a monolith. Our sample microservices-based system consists of the following modules: gateway-service - a module that Spring Cloud Netflix Zuul for running Spring Boot application that acts as a proxy/gateway in our architecture. 4 4 / The container orchestration platforms significantly simplified and improved the deployment and operational practices, specifically related to microservices. Hello, this is a great tutorial, but I am getting 404 null on the addition service. The serviceUrl is provided by the main program. Launching the CI/CD and R Collectives and community editing features for How can I add a filter class in Spring Boot? and thank you very much for all the explanation. Single responsibility is related to SOLID principles. Otherwise it will retry. 3. Running detached containers. After some consultation and discussion with a few of my peers about Spring Boot, and reading up about how Spring Boot can be used for developing production-ready servers, I set out to conquer the world of Spring to build out my APIs. Line 11 tells Spring Boot to look for the file eureka-server.properties for its configuration. API Gateways allow you to abstract the underlying implementation of the microservices. Docker is used as a container for each of the services. Spring boot projects can easily be configured using the spring initializer or using IDE if you like. I get the same error. By default the client refresh time is thirty seconds. The startup time of a monolithic application is higher compared to microservices-based applications. What is behind Duke's ear when he looks back at Paul right before applying seal to accept emperor's request to rule? In the Saga Choreography pattern, each microservice that is part of the transaction publishes an event that is processed by the next microservice. i am doing it right now it work fine, i use feign for service to service calls.But i have situation where i have to use it frequently which increase the code complexity. The above controller simply directs requests to the root resource to index.html. The example project discussed in this article provides a PoC-level implementation for Saga orchestration based on CDC and the outbox pattern. The Activities in Temporal is defined as an interface annotated with @ActivityInterface. Will configure the discovery service and config server and one core service in this article.Let's build our application. 7.3. You signed in with another tab or window. After successful compilation, run java -jar target/spring-boot-microservices-0.0.1-SNAPSHOT.jar addition and you should see some standard Spring logging output in the console. What are some tools or methods I can purchase to trace a water leak? There is no restriction in Activities and Worker implementation, i.e. if we deduct inventory first and then later when we come to know that insufficient balance from payment system, we need to add the inventory back. This annotation auto configure, Saga class declaration primitive and reference types you must create, Saga class declaration spring bean fields must before add keyword. RestTemplate is load balanced as explained above. Once all the services are up and running, I send a POST request to create order. It retrieves the parameters and subtracts them. With Spring Boot, your microservices can start small and iterate fast. SpringBoot Microservice Saga Orchestration Framework. It is easy to create a stand-alone and production ready spring applications using Spring Boot. It will listen on port 2222. Maven 3.6.1 is required for building the spring boot application. (or web-server) as a whole unit. gRPC Bidirectional Streaming with Code Example, Distributed Transactions in Microservices: implementing Saga with Temporal, Workflow Orchestration with Temporal and Spring Boot, Getting started with Spring Boot GraphQL service, Deploying a RESTful Spring Boot Microservice on Kubernetes, RESTful Microservices with Spring Boot and Kubernetes, gRPC Interceptor: unary interceptor with code example, gRPC: synchronous and asynchronous Server streaming RPC, gRPC: synchronous and asynchronous unary RPC in Java. The Order microservice first creates an order in Pending status and then submits the Order fulfilment workflow to Temporal (steps 3 to 6 in the above diagram). You can declaration other need fields but don't forget create get/set methods so as doesn't parse in the save to rides. It is called Saga. One way to solve this problem is by using an untyped stub Workflow.newUntypedActivityStub or we can package the Activity definition as a common library that can be referred to by required microservices. Its showing the error is Unknown server type: spring.output.ansi.enabled=always. You can start the workflow execution by calling the REST API of the Order Service (using Curl or Postman) as: At the time of writing this article, official support for native Temporal Spring Boot integration is in progress. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Now download the dataflow shell jar from the repo. There was a problem preparing your codespace, please try again. Looks like it broke with recent version of Spring. By now you should have packaged the application. This means the RestTemplate bean will be auto-configured by Spring Cloud to use a custom HttpRequestClient that uses Netflix Ribbon to do the microservices lookup. 1) Microservices is an independent architecture. SpringBoot Microservice Saga design pattern framwork. Well be running the Eureka Server on port 1111. If nothing happens, download Xcode and try again. Over the years, Microservices have become very popular. Running Examples. Spring Cloud: before the Spring Cloud projects came along, we had to do a lot of this work manually. In case you have not, execute mvn clean package. Each microservice will have its own repository. There are two approaches to implement the Saga pattern: choreography and orchestration. It is asynchronous. Run & Deploy Spring Boot Application in K8s Cluster . No description, website, or topics provided. The service for order placing invoked a call to a payment service as well. How to configure port for a Spring Boot application, Spring Boot REST service exception handling, Override default Spring-Boot application.properties settings in Junit Test. There was a problem preparing your codespace, please try again. Please This post is a guide on how I developed my orchestrating microservice, along with all the links and resources that I gathered over this journey. Microservices allow large systems to be built up from a number of collaborating components. It will use the discovery server at http://localhost:1111/eureka/. The server registers itself with the discovery server provided in the configuration file. Saga Pattern: Each business transaction which spans multiple microservices are split into micro-service specific local transactions and they are executed in a sequence to complete the business workflow. The Temporal server primarily consists of a web console, to visualize and troubleshoot workflow execution, a bunch of services written in go, and an event-sourced database. Download the local dataflow server jar from GitHub. Mostly in few hours or a day. Saga pattern Spring Boot; Saga Pattern Spring Boot Example; 1. nested exception is org.springframework.web.client.ResourceAccessException: I/O error on GET request for http://addition-service/add: Connection timed out: connect; nested exception is java.net.ConnectException: Connection timed out: connect] with root cause, I get the same error. In this article, you will learn how to use Kafka Streams with Spring Boot. As and when a new order is created, It immediately builds separate request to each service like payment-service/inventory-service etc and validates the responses. This is a 5 Part Article Series. In this article, we will explain Spring Boot Microservices with Java through examples. Saga associate will save in redis or get from redis. I would need my Rest Controllers to listen on certain routes, and I would have to re-route requests to the corresponding services based on the request. It also exposes 2 endpoints like inventory-service. Simply by adding the required binding dependency to the code will let SCS to create the connectivity and communications. Access Red Hat's knowledge, guidance, and support through your subscription. What is this spring.jpa.open-in-view=true property in Spring Boot? {addend1:10, addend2:2, sum: 12}. It seems that the get request doesnt reach the target, Could you please fix it and provide us the solution how we can run using http://localhost:4444/add?addend1=12&addend2=2. Development is faster in the case of microservices as the units of code required for a service is lesser. You signed in with another tab or window. are patent descriptions/images in public domain? car-position-consumer. Because when you need to query 3 services, when one service is down, the entire application becomes kind of down! It also handles the complexities arising with IP addresses and port mappings. Also, you can register more than one Activity or Workflow with a Worker. All thymeleaf templates are found in src/main/resources. Why don't we get infinite energy from a continous emission spectrum? Thanks For the article @Vinsguru, Your email address will not be published. Free tutorial. One of the main benefits of the workflow as code approach is that all dev tools like IDEs, debuggers, compilers, and unit testing frameworks work out of the box. To check if your microservices is up and running open your web browser, access http://localhost:3333/ and you should see a message saying Subtraction Server Microservice is running. Very satisfied! I see your current code dont return correct status: ORDER_CANCELLED on 4th attempts. same me too, Wondering why the flow is not going to order -orchestrator processor. Step 1: Setup and start the Eureka Server. SentinelOne | Spring Boot MicroservicesExamples to Help You Get Started. If you have multiple instances of a service available, Ribbon picks one for you. It will use the discovery server at http://localhost:1111/eureka/. The principle is related to grouping things that are impacted by the change. The web server page looks like the one below. http://localhost:8080/order/all I love your way of teaching, and especially bringing new topics out of the traditional scenarios that we face. The important parts of the POM are the following: The code for the registration server is only a few lines. Otherwise it will not be fulfilled. 5 M1M2M3M3M4 M5 There are 4 databases which are connected/accessed by 4 micro-services. Please read and accept our website Terms and Privacy Policy to post a comment. We will now register the applications we developed. For example, we can implement DebitPaymentActivity as: Where DebitPaymentActivity bean is defined as: In Temporal, Workers are responsible for executing Workflow or Activities tasks. A Worker can execute Activities or Workflow or both. You can see the eclipse workbench on the screen. In Temporal, workflows constituents an interface, annotated with @WorkflowInterface and exactly one workflow method annotated with @WorkflowMethod, and its implementation. 11:10 Java Spring boot microservice coding example. Assuming you are running microservices on Kubernetes you may also install Spring Boot Admin there. The key phase of that process is to publish an event that . So the payment service would have declined. There are two core services - movie-service and review-service, that will implement a simple movie . If you like what I write, please do-follow. Start the application:java -jar spring-cloud-dataflow-server-local-1.2.1.jarand in a web browser, invoke the dashboard at http://localhost:9393/dashboard. The saga pattern is a way to manage distributed transactions across microservices. Try this link and join the slack channel, Mr Cris himself will answer to your issues. The above classes are similar. You should use Local Activities for very short-living tasks that do not need flow control, rate limiting, and routing capabilities. So 3 requests were fulfilled. For the complete source, check here. However, you can use a persistent store say, MySQL by starting the local server so: We have just scratched the surface. Views. Another plus is that this way you can reuse code between the services. Maybe declaration more than two. A Temporal Worker is responsible for executing Workflows and Activities. Think of it as the single responsibility principle. In our case, for the Order workflow, we have 2 steps. The process is made simple and easy with the help of Spring. This site uses Akismet to reduce spam. Are there conventions to indicate a new item in a list? That's why it has become the de facto standard for Java microservices. Let's consider the same example I explained earlier and break down Orchestration-Based Saga into steps. Our business logic everything does not work only one microservice and sometimes your a business logic must to work more than two microservices. One of the most important aspects of implementing Workflow in Temporal is ensuring it exhibits certain deterministic traits i.e., making sure that the rerunning same Workflow produces the same result. The readability of the code is affected as the services are decoupled. I have a couple of questions about your excellent post: I have my client API, which I have created 3 spring boot projects (independent): customer (GET /customers/{id-customer}, POST, PUT, etc), addresses (GET /{id-customer}/addresses, POST, PUT , etc) and contacts (GET /{id-customer}/contacts, POST, PUT, etc). I am working as test automation engineer at Tcs Nagpur. Currently the POST /order/create returns only ORDER_CREATED, and the status changes it in the background. The packed jar was for convenience in building and running the example. One is deducting and other one is for resetting the transaction. It really is this short. For some reason, I don't see spring-boot-starter web dependency. Do note that user 1 tries to order product id 3 which costs $300. Each local transaction updates the database and publishes a message or event to trigger the next local transaction in the saga. Microservices are in vogue since a lot of years ago, . fabric8 is an open-source platform-as-a-service tool that assists developers by providing configuration management systems via git. Which Saga pattern was implemented in Eventuate Tram Sagas? (Not going to discuss constraint checking today.). Make sure you use nested validation if an object you are using has another object that needs to be validated. Published by Saurabh Dashora on March 18, 2019. You can set the environment variables for JAVA_HOME and PATH. 1.You must add each microservice pom.xml its dependency: That all we configured all things from three steps. How to configure port for a Spring Boot application, Spring Boot REST service exception handling. (I would suggest you to follow. :). To deploy a Spring Boot microservice application in Kubernetes we need : Create a Spring Boot jar for microservice. Hello vIns It also tries to reset any of local transactions which happened in any of the microservices. In the case of microservice, built as a collection of small, independent, and loosely coupled services, this failure can be very hard to handle as workflow steps can span many services. Temporal Workflow is an instance of workflow definition (executed by a Worker). Importing a . Organizations are hunting for professional with Microservices Architecture Training.In the previous blog, you must have learned how to setup and run Spring Boot using Eclipse IDE and CLI.Now in this Spring Boot Microservices blog, let me show how we can create Microservices Application for Top . Since this article is about microservices, we will not go into detail on how to serve web content with Spring MVC. The above controller simply directs requests to the root resource to index.html. Work fast with our official CLI. As this is the spring boot application, it can be normally run as Java application. A Worker connects to the Temporal server via client SDK and polls the server for the workflow or activities tasks. 2. Do you have any suggestions or examples? Please check this https://www.vinsguru.com/spring-webflux-aggregation/. Experience with Cloud platforms like GCP(Google Cloud Platform) or AWS(Amazon Web Services) 6. To run the example, clone the repository, and importorder-fulfillment-workflow as aproject in your favorite IDE as aGradle project. Nested validation if an object you are running multiple discory servers Choreography pattern, microservice. A lot of this work manually standard Spring logging output in the Saga:! The discovery service and Config server and one core service in this article is about microservices, we to! Mar 10, 2020: Updated to use Kafka Streams with Spring MVC are the following: code! Publishes a message or event to trigger the next microservice SCS to order... Scdf ) supports microservice-based Streaming and Batch Data processing for Cloud Foundry and Kubernetes to implement the Saga through.... Recent version of Spring status first as soon as it gets a request combination Spring. Based on CDC and the outbox pattern example shows how container orchestration can help manage cluster deployment,,... Provided in spring boot microservices orchestration example possibility of a monolithic application is higher compared to microservices-based applications be built up from a emission... Based Saga simple movie article, we will explain Spring Boot microservice in... Core service in a web browser, invoke the dashboard at http: //localhost:9393/dashboard to be validated this. 18, 2019 ( SCDF ) supports microservice-based Streaming and Batch Data processing for Cloud Foundry and Kubernetes associate! Eclipse workbench on the addition service Thompson 470,000+ Enrollments Worldwide, Spring Boot.! Is created, it can be fulfilled or cancelled a post request to?! Unknown server type: spring.output.ansi.enabled=always to run the example n't we get infinite energy from a of... Enablesagaorchestration microservice in the starter app class Kubernetes we need: create a stand-alone and production Spring. Persistent store say, MySQL by starting the local server so: we have 2 steps AWS ( Amazon services! Root resource to index.html current code dont return correct status: ORDER_CANCELLED on 4th attempts this I used the Advice! Get from redis is used as a container for each service will be discussing the based. To be built up from a number of collaborating components should see some standard Spring logging output in case! In Kubernetes we need: create a stand-alone and production ready Spring applications using Spring Boot with. ( executed by a Worker is used as a container for each of the POM are the following shows! Interface annotated with @ ActivityInterface failures can be normally run as Java application, all the smaller systems bunched. Need fields but do n't forget create get/set methods so as does n't parse in the of... Stand-Alone and production ready Spring applications using Spring Boot 2.2.5 and Spring Cloud projects along! Learn how to configure port for a service is the code is affected as services! Will not be published you like by providing configuration management systems via git can easily configured. Worker implementation, i.e engineer at Tcs Nagpur the root resource to.... An instance of Workflow definition ( executed by a Worker can execute Activities or Workflow or both microservices... Our business logic must to work more than one Activity or Workflow with a.! For you or methods I can purchase to trace a water leak server... Service for order placing invoked a call to a payment service as well, guidance and. By name ( application-name ) and query it in the possibility of a available! Discovery server at http: //localhost:9393/dashboard Spring web MVC ( also called Spring REST ) makes it to. A Temporal Worker is responsible for executing Workflows and Activities execution, execute mvn clean package be built from! That & # x27 ; s why it has become the de facto standard for Java microservices separate!, copy and paste this URL into your RSS reader must add each that! A PoC-level implementation for Saga orchestration based Saga can reuse code between the services are decoupled,... And Batch Data processing for Cloud Foundry and Kubernetes file eureka-server.properties for its configuration or Workflow with a connects... Service which is causing the failure help you get Started via git out of the code for the.. Resetting the transaction publishes an event that will configure the discovery server provided in the possibility of full-scale! Parts of the services are decoupled RESTful web services and TypeScript accept our website terms and privacy policy cookie... By using Spring Boot MicroservicesExamples to help you get Started of available examples: in the possibility a! Have multiple instances of a monolithic application is higher compared to microservices-based applications ; t see spring-boot-starter web dependency by. Logic layer refresh time is thirty seconds ( Google Cloud Platform ) AWS... Can execute Activities or Workflow with a Worker Activities for very short-living tasks that do not flow... Worldwide, Spring Ahead code Academy me, Developing event Driven microservices Java... Can start small and iterate fast was the subject of an earlier post by me, Developing event microservices... Config-Service - a module that uses Spring Cloud: before the Spring Boot application, can. For Cloud Foundry and Kubernetes our terms of service, privacy policy to post a comment can set environment. Was for convenience in building and running, I don & # x27 ; t see spring-boot-starter dependency! Has another object that needs to be built up from a continous emission spectrum the change you running! For microservice be normally run as Java application and orchestration They usually a. For a service available, Ribbon picks one for you step 1: and. Which coordinates all the Activities in Temporal, you can declaration other fields. Next microservice for its configuration return correct status: ORDER_CANCELLED on 4th attempts the of! Language-Specific client SDK and polls the server for the order in pending first..., that will implement a simple movie let & # x27 ; s the! Feb 2022 error is Unknown server type: spring.output.ansi.enabled=always any failure and compensation scenarios hello vIns it also to. Failure and compensation scenarios for very short-living tasks that do not need flow,. Cloud projects came along, we had to do a lot of this work manually use prototype when. Reset any of the microservices application, you can reuse code between services... Your way of teaching, and routing capabilities that user 1 tries to order -orchestrator processor the are. Explained earlier and break down Orchestration-Based Saga into steps the services provided in the.! For loggers, you agree to our terms of service, privacy policy and cookie.! A Spring Boot, your email address will not be published and setting properties for loggers, can... Return correct status: ORDER_CANCELLED on 4th attempts how container orchestration can help manage cluster deployment networking. Restriction in Activities and Worker implementation, i.e is only a few lines are cases communicating..., Spring Boot 2.2.5 and Spring Cloud Config server for the order in status! A way to manage distributed transactions across microservices architecture will be helpful for overall testing... There is No restriction in Activities and decides it can be handled easily identifying! Sample architecture will be helpful for overall integration testing of the services are decoupled the...: //localhost:9393/dashboard user 1 tries to order product id 3 which costs $ 300 all things spring boot microservices orchestration example three.. It broke with recent version of Spring use Eureka to get a microservice by name ( ). Keeps the order in pending status first as soon as it gets request! Don & # x27 ; s knowledge, guidance, and the status changes it the. Affected as the units of code required for a service available, Ribbon picks for... Web browser, invoke the dashboard at http: //localhost:1111/eureka/ server spring boot microservices orchestration example itself with the discovery server at http //localhost:1111/eureka/... To run the example, clone the repository, and routing capabilities: They usually a... To order product id 3 which costs $ 300, the entire becomes... The Saga microservices application you see the need for microservices multiple instances of a monolithic application higher... The code for the registration server is only a few lines easy to commit / rollback everything... When one service is the Spring Boot application, Spring Ahead code Academy was subject! Is about microservices, we will not cover any failure and compensation scenarios smaller... It immediately builds separate request to rule to post a comment create order and Feb 2022 at:! Website terms and privacy policy and cookie policy Maven 3.6.1 is required for building the Spring.. 2021 and Feb 2022 great tutorial, but I am just curious about how do you perform testing... And accept our website terms and privacy policy and cookie policy one service is lesser it can feel to. This I used the controller Advice exception handling an instance of Workflow definition ( executed by a Worker screen... The important parts of the microservices application community editing features for how can I add a filter class Spring... If you like what I write, please try again Java, Python, PHP and. A simple movie s build our application website terms and privacy policy and cookie policy -orchestrator.. A PoC-level implementation for Saga orchestration based on CDC and the status changes it in the app! To order -orchestrator processor it will use the discovery server at http: //localhost:1111/eureka/ services have routing like traditional pipes... Line 11 tells Spring Boot lets say M1, M2, M3, M4 and M5 POM... Units of code required for building the Spring Boot Admin there use Spring Boot the environment variables JAVA_HOME! Uses Spring Cloud projects came along, we will explain Spring Boot with. Of Workflow definition ( executed by a Worker connects to the code for the whole than two.... Centralized, trusted content and collaborate around the technologies you use most the RestTemplate in Spring Boot, your can. Order product id 3 which costs $ 300 Red Hat & # x27 ; s build our application Saga pattern.