title: Unable to load builtin provider: org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider
body: <p><br/>
  I'm trying to post some Objects (Strings) to a REST service deployed on WildFly application server using a Java Desktop application. 
  Unfortunately, I don't have Maven available at runtime for the Client so I have to add manually the required JAR files. However even with a simple POST like this:</p>
  
  <pre><code>public static void testParam() {
      Client client = ClientBuilder.newClient();
      String s="DatiAtto.xml";
      WebTarget myResource = client.target(BASE_URL+"/create");
      Response rs = myResource.request()
      .post(Entity.text(s), Response.class);
  }
  </code></pre>
  
  <p>I get as return: <br/>
  <strong><em>Unable to load builtin provider: org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider</em></strong> <br/>
  So far I have added the following JAR files to the Desktop application: </p>
  
  <ul>
  <li>jaxrs-api-3.0.8.Final.jar </li>
  <li>resteasy-jaxb-provider-3.0.8.Final.jar</li>
  <li>resteasy-jackson2-provider-3.0.8.Final.jar</li>
  <li>resteasy-client-3.0.8.Final.jar </li>
  <li>resteasy-jaxrs-3.0.8.Final.jar</li>
  </ul>
  
  <p>looking at the content of them, the class <strong>org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider</strong> should be packaged into <strong>resteasy-jackson2-provider-3.0.8.Final.jar</strong>. Why is not being loaded ?</p>