Eclipse Microprofile Configuration with Java EE 8 and JBoss EAP 7.2

Here we are going to look at Eclipse Microprofile Configuration with Java EE 8 and JBoss EAP 7.2.

The configuration project is a convenient project to easily load configuration from:

• System Property, e.g. -Dnum.size=20
• Properties file, e.g. configuration.properties

To get started we use the previous blog project setup, with pom.xml, web.xml, beans.xml and persistence.xml. Please see https://magnus-k-karlsson.blogspot.com/2019/10/eclipse-microprofile-and-java-ee-8-with.html.

And the injection configuration:

package se.magnuskkarlsson.example.microprofile.boundary;

import javax.inject.Inject;
import javax.json.Json;
import javax.json.JsonObject;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.eclipse.microprofile.config.inject.ConfigProperty;

@Path("/persons")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class PersonResource {

    @Inject
    @ConfigProperty(name = "num.size", defaultValue = "12")
    int numSize;

    @GET
    public Response hello() {
        JsonObject json = Json.createObjectBuilder().add("message", "HELLO " + numSize).build();
        return Response.ok(json.toString()).build();
    }

}

And to make JAX-RS complete we also need

package se.magnuskkarlsson.example.microprofile;

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@ApplicationPath("/rest")
public class JAXRSApplication extends Application {

}

Now we can build and deploy the web application. To configure we have now two options

• System Properties, e.g. ./standalone.sh -Dnum.size=20
• Property File, e.g. ./standalone.sh -P ../standalone/configuration/configuration.properties

Test both ways, but for production, property file is the recommended way.