RESTEasy: Can't deploy WebApp if more than one subclass of javax.ws.rs.Application is present

If I packed WAR WebApp with more that one subclass of javax.ws.rs.Application, deployment fails with "JBAS011232: Only one JAX-RS Application Class allowed."

This is not correct because it is against JAX-RS 1.1. specs where invalid situation (in section 2.3.2) is only when "It is a n error for
more than one application to be deployed at the same effective servlet mapping".

If you have any objections, please compare to reference JEE6 and JAX-RS implementation represented by the GlassFish Prelude 3.1.1 application server with already fully JEE6 platform support.