Has anyone managed to get EMMA to work in JBoss 7?

I have followed the instructions in the Emma FAQ:
a) I have put emma.jar in the <jre>/lib/ext directory,
b) instrumented some files,
c) packaged them in an EAR, and deployed them to the  server.

Yet when the application is started I cannot get a remote jvm to connect to it using the Emma ctl tool, and there are no Emma messages in the server logs.

A standalone program run using emmarun can be connected to usign ctl, so emma.jar is available to java.  I have also verified that the files being packaged have actually been instrumented.

Any help would be gratefully accepted.