Exploring Spring Cloud's OpenFeign Integration Through a Demonstrative Project Example

Exploring Spring Cloud's OpenFeign Integration Through a Demonstrative Project Example

In this article, we will guide you through the process of developing the Microservice, a key component of the project.

Project Setup

1. Create a new Spring Boot project in Spring Initializr, choosing Maven, Java 17, Spring Data JPA, MySQL Driver, Spring Web, and OpenFeign as dependencies.
2. For Maven, add this dependency to the file:
3. For Gradle, add the following entries to the file:
4. The project structure for the Microservice is to be created in IntelliJ IDEA.

Database Setup

1. A schema named classroom is to be created in MySQL Workbench for the Microservice.
2. A table named students is to be created in the schema with four columns: id, name, age, and grade. The column grade is a foreign key.

Entity and Repository

1. A entity/model class named Student is to be created.
2. A repository interface named StudentRepository is to be created.
3. A service class named StudentService is to be created.
4. A service class named GradeService is to be created.

Model Responses and Clients

1. A class named StudentResponse is to be created.
2. Create a FeignClient for consuming REST API endpoints exposed by the classlink.
3. Create a GradeClient to model the response from the classroom.

Controller and Application

1. A Controller is to be created with an endpoint for finding the address using classlink.
2. Create an Application class.
3. Modify the StudentService and GradeService classes as needed.

Configuration

1. Make changes in the application.properties file. For the Microservice, the changes are to be made in the file specific to this project.

Application Properties for address-service Microservice

• spring.datasource.url=jdbc:mysql://localhost:3306/gfgmicroservicesdemo
• spring.datasource.username=your_username
• spring.datasource.password=your_password
• spring.jpa.hibernate.ddl-auto=update

FeignClient

1. Feign is a declarative REST client that creates a dynamic implementation of the interface declared as FeignClient. Writing web services with the help of FeignClient is easier.

OpenFeign

1. OpenFeign is an open-source project originally developed by Netflix and later moved to the open-source community. The OpenFeign library was transferred from Netflix to the open community by Pivotal (now part of VMware).

Schema Initialisation and Sample Data

1. Create a schema named spring 2024 in MySQL Workbench and put some sample data in the students table.

Referenced Articles

For a better understanding of the Spring Annotation and the Spring Annotation, the following articles are recommended:

• Understanding the Spring @Configuration Annotation
• Understanding the Spring @Bean Annotation

With these steps, you should now have a solid foundation for developing the Microservice. Happy coding!

Read also:

• Exploring Harry Potter's Lineage: Decoding the Enigma of His Half-Blood Ancestry
• Elon Musk Acquires 26,400 Megawatt Gas Turbines for Powering His AI Project, Overlooks Necessary Permits for Operation!
• U Power's strategic collaborator UNEX EV has inked a Letter of Intent with Didi Mobility to deploy UOTTA(TM) battery-swapping electric vehicles in Mexico.
• Global Gaming Company, LINEUP Games, Moves Into Extensive Global Web3 Multi-Platform Gaming Network