Microservice Starter based on Micronaut

A modern, JVM-based, full-stack framework for building modular, easily testable microservice and serverless applications.

Packaging

Micronaut uses maven shade plugin for packaging the applcation which put all the runtime dependencies an uber jar.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
    <executions>
      <execution>
      <phase>package</phase>
      <goals>
        <goal>shade</goal>
      </goals>
        <configuration>
          <transformers>
            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
              <mainClass>${mainClass}</mainClass>
            </transformer>
          <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
        </transformers>
      </configuration>
    </execution>
  </executions>
</plugin>

Deployment

Micronaut supports http deployment based on netty server and partial/compatible support for JAX-RS resrouces.

<dependencies>
  <dependency>
    <groupId>io.micronaut.jaxrs</groupId>
    <artifactId>micronaut-jaxrs-server</artifactId>
    <version>1.0.0.M1</version>
  </dependency>
  <dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-runtime</artifactId>
  </dependency>
  <dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-http-server-netty</artifactId>
    </dependency>
</dependencies>

In addition to these it required additional plugins/ dependecies at compile phase to process its annotations.

<annotationProcessorPaths>
  <path>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-inject-java</artifactId>
  </path>
  <path>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-validation</artifactId>
  </path>
  <path>
    <groupId>io.micronaut.jaxrs</groupId>
    <artifactId>micronaut-jaxrs-processor</artifactId>
  </path>
</annotationProcessorPaths>

Launcher

Micronaut provides build in runner class that can be invoked through main class.

public class Application {
    public static void main(String[] args) {
        Micronaut.run(Application.class);
    }
}

which can be trigger in multiple ways.

Dev

mvn exec:java

Prod

java - jar target/microservice-starter-micronaut.jar