RESTEasy: Empty cfg. param resteasy.resources produces exception

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="false">

   <servlet-mapping>
      <servlet-name>javax.ws.rs.core.Application</servlet-name>
      <url-pattern>/myjaxrs/*</url-pattern>
   </servlet-mapping>
                                                                                                                                                                             
   <context-param>
      <param-name>resteasy.resources</param-name>
      <param-value></param-value>
   </context-param>
</web-app>"