The combination of Java framework and container technology: how to build efficient microservices

By combining Java frameworks (Spring Boot, Spring MVC, JAX-RS, Javalin, etc.) and container technologies (Docker, Kubernetes, etc.), efficient microservices can be built. The Java framework provides the infrastructure, including routing, processing, validation, and error handling. Container technology provides a lightweight runtime environment with isolation, portability, and scalability. Practical example: Create a microservices application using the Spring Boot framework and Docker containers, with test steps provided.

The combination of Java framework and container technology: building efficient microservices

Introduction

In modern application development, microservices architecture has become the de facto standard. Microservices break down an application into smaller, independent services, each responsible for performing a specific task. In order to build and deploy microservices, a combination of Java frameworks and container technologies are used. This article will guide you through how to combine these technologies to build efficient microservices.

Java Framework

The Java Framework provides the infrastructure for building web applications, providing the following functionality:

• Routing and request handling
• Data validation and conversion
• Error handling

Common Java frameworks include:

• Spring Boot
• Spring MVC
• JAX-RS
• Javalin

##Container technology

Isolation: Each microservice runs in its own container, isolated from other services.
• Portability: Containers can be easily deployed on different machines.
• Scalability: Containers can be easily expanded or shrunk as needed.

Practical Case

Step 1: Create a Spring Boot application

@RestController
public class HelloController {
    @GetMapping("/")
    public String hello() {
        return "Hello, world!";
    }
}

Step 2: Create a Dockerfile

FROM openjdk:8
ADD target/*.jar app.jar
CMD java -jar app.jar

Step 3 :Build and run the container

docker build -t my-app .
docker run -p 8080:8080 my-app

Test the microservice

curl localhost:8080

Conclusion

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