Java EE and Docker: Building scalable microservices

By combining Java EE and Docker, you can build microservices that are scalable, portable, and easy to deploy. Specific steps include: Using Maven archetype to create a Java EE project. Add code in DemoServlet.java to handle the request. Create a Dockerfile specifying the base image and running commands. Build and run microservices. Visit http://localhost:8080/demo to view the microservices.

Java EE and Docker: Building scalable microservices

With the rise of cloud computing, microservice architecture is becoming more and more popular. Microservices is a software design approach that breaks an application into loosely coupled, independently deployed modules. This approach provides many benefits, including scalability, maintainability, and resiliency.

Java EE is a platform for building enterprise applications. It provides a set of standards and APIs that simplify developers' tasks. Docker is a containerization platform that lets you package applications into standard units to run reliably on any machine.

Using Java EE and Docker together, you can build microservices that are scalable, portable, and easy to deploy.

Practical Case

In this practical case, we will create a simple Java EE microservice, package it using Docker, and deploy it to Kubernetes.

First, create a new Java EE project:

mvn archetype:generate -DgroupId=com.example -DartifactId=demo -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4

Next, add in src/main/java/com/example/demo/DemoServlet.java The following code:

@WebServlet("/demo")
public class DemoServlet extends HttpServlet {

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Hello, world!");
    }
}

Next, add the Dockerfile to the project root directory:

FROM openjdk:11

WORKDIR /app

COPY target/demo.war /app/demo.war

CMD ["/usr/local/tomcat/bin/catalina.sh", "run"]

Finally, build and run the microservice:

mvn clean package

docker build -t demo .

docker run -p 8080:8080 --rm demo

Now, you can Visit http://localhost:8080/demo to view your microservices.

The above is the detailed content of Java EE and Docker: Building scalable microservices. For more information, please follow other related articles on the PHP Chinese website!