In order to integrate RESTEasy with EJB, you must first modify the published interfaces of your EJB. Currently, RESTEasy only has simple portable integration with EJBs, so you must also manually configure your RESTEasy war file.

To make an EJB function as a JAX-RS resource, you must annotate an SLSB's @Remote or @Local interface with JAX-RS annotations:

@Local
@Path("/Library")
public interface Library {
   @GET
   @Path("/books/{isbn}")
   public String getBook(@PathParam("isbn") String isbn);
}
@Stateless
public class LibraryBean implements Library {
...
}

Next, in RESTEasy's web.xml file, you must manually register the EJB with RESTEasy using the resteasy.jndi.resources <context-param>

<web-app>
   <display-name>Archetype Created Web Application</display-name>
   <context-param>
      <param-name>resteasy.jndi.resources</param-name>
      <param-value>LibraryBean/local</param-value>
   </context-param>
   <listener>
      <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
   </listener>
   <servlet>
      <servlet-name>Resteasy</servlet-name>
      <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
   </servlet>
   <servlet-mapping>
      <servlet-name>Resteasy</servlet-name>
      <url-pattern>/*</url-pattern>
   </servlet-mapping>
</web-app>