anchor.diff:  * `io.quarkus.builder.item.MultiBuildItem` if you want to have multiple instances (e.g. `ServletBuildItem`, you can produce many Servlets during the deployment).
   
   It's now time to declare our HTTP endpoint. To do so, we need to produce a `ServletBuildItem`.
  -At this point, we are sure you understood that if the `quarkus-undertow` dependency proposes Servlet support for our `runtime` module, we will need the `quarkus-undertow-deployment` dependency into our `deployment` module to have access to the `io.quarkus.undertow.deployment.ServletBuildItem`.
  -
  -Update the `./greeting/deployment/pom.xml` as follows:
  +At this point, we are sure you understood that if the `quarkus-undertow` dependency proposes Servlet support for our `runtime` module, we will need the `quarkus-undertow-deployment` dependency in our `deployment` module to have access to the `io.quarkus.undertow.deployment.ServletBuildItem`.
  +
  +Update the `./quarkus-greeting/deployment/pom.xml` as follows:
   
   [source, xml]
   ----
       <dependencies>
  -        <dependency>
  -            <groupId>io.quarkus</groupId>
  -            <artifactId>quarkus-core-deployment</artifactId>
  -            <version>${quarkus.version}</version>
  -        </dependency>
           <dependency>
               <groupId>org.acme</groupId>
               <artifactId>quarkus-greeting</artifactId>
  
positive.code: 
  The `runtime` module is where you develop the feature you want to propose to your users, so it's time to create our Web Servlet.
  
  To use Servlets you need to have a Servlet Container such as http://undertow.io[Undertow].
  There is a Quarkus Undertow extension to use the web server with all the Quarkus benefits.
  We need to add the extension as a dependency to `./greeting/runtime/pom.xml`.
  
  [source, xml]
  ----
      <dependencies>
  
negative.code: 
      <artifactId>quarkus-greeting</artifactId>  <!--1-->
      <name>Greeting Extension - Runtime</name>
  
      <dependencies>
          <dependency>
              <groupId>io.quarkus</groupId>
              <artifactId>quarkus-core</artifactId>
          </dependency>
      </dependencies>
  
      <build>
          <plugins>
  