anchor.diff:  </build>
   ----
   
  -If we focus on the dependencies section, you can see 2 extensions allowing the development of REST applications:
  +If we focus on the dependencies section, you can see one of the 2 extensions allowing the development of REST applications:
   
   [source,xml]
   ----
  
positive.code:         <groupId>io.quarkus</groupId>
          <artifactId>quarkus-resteasy</artifactId>
      </dependency>
      <dependency>
          <groupId>io.quarkus</groupId>
          <artifactId>quarkus-arc</artifactId>
      </dependency>
  ----
  
  [NOTE]
  .What's ArC?
  ====
  ArC is a CDI-based dependency injection solution tailored for Quarkus architecture - see also link:cdi-reference.html[Contexts and Dependency Injection].
  ====
  
  === The JAX-RS resources
  
  
negative.code: 
  == Using injection
  
  In order to use dependency injection, we can use ArC which is a CDI-based dependency injection solution tailored for Quarkus architecture - see also link:cdi-reference.html[Contexts and Dependency Injection].
  The `quarkus-arc`, dependecy of the `quarkus-resteasy`, is used for this purpose.
  
  Let's modify the application and add a companion bean.
  Create the `src/main/java/org/acme/quickstart/GreetingService.java` file with the following content:
  
  