When using the AJP connector to send requests to the server the matrix parameters included in the URL aren't available in the result of the HttpServletRequest#getRequestURI method. Actually, anything in the URL after the first ";" is removed:

/a;x=1 -> getRequestURI() = /a
/a;x=1/b -> getRequestURI() = /a

The same request using the HTTP connector works correctly.

This may have been introduced by the fix for WFLY-2251.