In guvnor, we're trying to create a single generic war, to deploy to any app server or servlet container.

This war contains:
1) WEB-INF/lib/resteasy-*.jar files
2) this code in WEB-INF/web.xml

  <context-param>
    <param-name>resteasy.injector.factory</param-name>
    <param-value>org.jboss.resteasy.cdi.CdiInjectorFactory</param-value>
  </context-param>

That generic war deploys without a problem on Tomcat and Jetty, but fails on JBoss AS 7 (with a cryptic message I might add), because 1) and 2) should be removed for JBoss only. That shouldn't be the case. It should just act as if the resteasy jars in the war file and the context-param in the web.xml file aren't there.

Weld had a similar problem, but they already fixed it for JBoss AS 7.1: AS7-2119.