Wildfly Swarm: a combination of lightweight Java framework and containers

Wildfly Swarm is a lightweight Java framework that combines Wildfly server and Docker container technology to provide a fast, portable and scalable Java application deployment solution. Key benefits include: lightweight, containing only the components needed to run the application, reducing container size and startup time. Scalability, use the Docker orchestration tool to easily scale applications to multiple containers. Portability, Docker containers eliminate platform-specific deployment issues, allowing applications to run in any Docker-enabled environment.

Wildfly Swarm: A combination of lightweight Java framework and containers

Wildfly Swarm is a lightweight Java framework that allows you to easily deploy using Docker containers your Java application. It combines Wildfly server and Docker container technology to provide a fast, portable and scalable deployment solution.

Key Benefits

• Lightweight: Contains only the necessary components needed to run your application, reducing container size and startup time.
• Scalability: Using Docker orchestration tools such as Kubernetes, applications can be easily scaled to multiple containers.
• Portability: Docker containers eliminate platform-related deployment issues, allowing you to run applications in any environment that supports Docker.

Practical case: Deploy a simple Web application

1. Create a Maven project

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>
  <artifactId>wildfly-swarm-demo</artifactId>
  <version>1.0.0-SNAPSHOT</version>
</project>

2. Add Wildfly Swarm dependencies

<dependencies>
  <dependency>
    <groupId>org.wildfly.swarm</groupId>
    <artifactId>wildfly-swarm-jaxrs</artifactId>
    <version>17.0.1.Final</version>
    <type>pom</type>
  </dependency>
</dependencies>

3. Create your JAX-RS web application

@Path("/")
public class MyResource {

  @GET
  public String hello() {
    return "Hello from Wildfly Swarm!";
  }
}

4. Create a Dockerfile

FROM registry.access.redhat.com/ubi8/openjdk-11
ADD target/wildfly-swarm-demo.jar /wildfly-swarm-demo.jar
CMD ["java", "-jar", "/wildfly-swarm-demo.jar"]

5. Build and run the Docker image

mvn clean package
docker build -t wildfly-swarm-demo .
docker run -p 8080:8080 wildfly-swarm-demo

Visithttp://localhost:8080, you should see "Hello from Wildfly Swarm !" message.

Wildfly Swarm provides a simple, lightweight, and scalable solution for deploying Java applications, combining it with the benefits of Docker containers. It allows you to quickly and easily deploy and manage applications in different environments.

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