RESTEasy: Empty cfg. param resteasy.providers 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.providers</param-name>
      <param-value></param-value>
   </context-param>
</web-app>"

16:13:23,956 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/jaxrsnoap]] (http-pjanouse.brq.redhat.com-127.0.0.1-8080-1) StandardWrapper.Throwable: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
        at java.lang.String.charAt(String.java:686) [:1.6.0_27]
        at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:477) [jboss-modules.jar:1.1.0.CR4]
        at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:421) [jboss-modules.jar:1.1.0.CR4]
        at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:143) [jboss-modules.jar:1.1.0.CR4]
        at org.jboss.resteasy.spi.ResteasyDeployment.registerProvider(ResteasyDeployment.java:499) [resteasy-jaxrs-2.3.0.GA.jar:]
        at org.jboss.resteasy.spi.ResteasyDeployment.registration(ResteasyDeployment.java:313) [resteasy-jaxrs-2.3.0.GA.jar:]
        at org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:225) [resteasy-jaxrs-2.3.0.GA.jar:]
        at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.init(ServletContainerDispatcher.java:67) [resteasy-jaxrs-2.3.0.GA.jar:]
        at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.init(HttpServletDispatcher.java:36) [resteasy-jaxrs-2.3.0.GA.jar:]
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:952) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:188) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.5.Final.jar:]
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:151) [jboss-as-web-7.1.0.CR1-SNAPSHOT.jar:]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.5.Final.jar:]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.5.Final.jar:]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.5.Final.jar:]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.5.Final.jar:]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.5.Final.jar:]
        at java.lang.Thread.run(Thread.java:662) [:1.6.0_27]