The Resteasy users guide says

21.4. Using Jackson 2.2.x Inside of JBoss AS7

If you want to use Jackson 2.2.x inside of JBoss AS7 you'll have to create a jboss-deployment-structure.xml file within your WEB-INF directory. By default AS7 includes the Jackson 1.9.x JAX-RS integration, so you'll want to exclude it from your dependencies, and add the jackson2 ones.

<jboss-deployment-structure>
    <deployment>
        <exclusions>
           <module name="org.jboss.resteasy.resteasy-jackson-provider"/>
        </exclusions>
        <dependencies>
            <module name="org.jboss.resteasy.resteasy-jackson2-provider" services="import"/>
        </dependencies>
    </deployment>
</jboss-deployment-structure> 

Besides the fact that we're referring to AS 7 (maybe we should also address JBoss 4.2.3.Final, my favorite), I'm guessing that this step is no longer necessary. Can someone verify that?

And what about

To enable JacksonJsonpInterceptor in WildFly, you need to import annotations from org.jboss.resteasy.resteasy-jackson-provider module using jboss-deployment-structure.xml:

<jboss-deployment-structure>
  <deployment>
    <dependencies>
      <module name="org.jboss.resteasy.resteasy-jackson-provider" annotations="true"/>
    </dependencies>
  </deployment>
</jboss-deployment-structure>

That also seems to be outdated. Thanks.