Chapter 5. Using Quarkus dependency injection

Procedure

1. To modify the application and add a companion bean, create the src/main/java/org/acme/quickstart/GreetingService.java file with the following content:

   package org.acme.quickstart;
   
   import javax.enterprise.context.ApplicationScoped;
   
   @ApplicationScoped
   public class GreetingService {
   
       public String greeting(String name) {
           return "hello " + name;
       }
   
   }

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2. Edit the src/main/java/org/acme/quickstart/GreetingResource.java to inject the GreetingService and create a new endpoint using it:

   package org.acme.quickstart;
   
   import javax.inject.Inject;
   import javax.ws.rs.GET;
   import javax.ws.rs.Path;
   import javax.ws.rs.Produces;
   import javax.ws.rs.core.MediaType;
   
   import org.jboss.resteasy.annotations.jaxrs.PathParam;
   
   @Path("/hello")
   public class GreetingResource {
   
       @Inject
       GreetingService service;
   
       @GET
       @Produces(MediaType.TEXT_PLAIN)
       @Path("/greeting/{name}")
       public String greeting(@PathParam String name) {
           return service.greeting(name);
       }
   
       @GET
       @Produces(MediaType.TEXT_PLAIN)
       public String hello() {
           return "hello";
       }
   }

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3. If you stopped the application, enter the following command to restart it:

   ./mvnw compile quarkus:dev

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4. To verify that the endpoint returns hello quarkus, enter the following command in a new terminal window:

   curl -w "\n" http://localhost:8080/hello/greeting/quarkus
   hello quarkus

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