ServletRequest/Repsonse have custom wrappers preventing them from being passed to RequestDispatcher

When you use @Context HttpServletRequest/HttpServletResponse, RESTEasy uses it's own wrapper classes implementing the interface rather than the javax.servlet.http ones.

This means that you cannot pass then to RequestDispatcher.forward(), because the Servlet specification says that you must pass the original request/response or javax.servlet.http.HttpServlet

{Request,Response}

Wrapper objects that are chained from the original ones.

If you deploy a JAX-RS application containing the following code, it will fail:
@Context private ServletContext ctx;

@GET
@Path("/")
public void fizzle(@Context HttpServletRequest req, @Context HttpServletResponse res) throws IOException, ServletException

{ ctx.getRequestDispatcher("fozzle").forward(req, res); }

On AS7, it will produce an error like:

javax.servlet.ServletException: Original SevletRequest or wrapped original ServletRequest not passed to RequestDispatcher in violation of SRV.8.2 and SRV.14.2.5.1
at org.apache.catalina.core.ApplicationDispatcher.checkSameObjects(ApplicationDispatcher.java:1146) [jbossweb-7.0.16.Final-redhat-1.jar:]
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:512) [jbossweb-7.0.16.Final-redhat-1.jar:]
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:488) [jbossweb-7.0.16.Final-redhat-1.jar:]
at example.RestService.fizzle(MockResource.java:36) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_23]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [rt.jar:1.6.0_23]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [rt.jar:1.6.0_23]
at java.lang.reflect.Method.invoke(Method.java:597) [rt.jar:1.6.0_23]
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167) [resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) [resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) [resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) [resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525) [resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]