Invisible remote services with Spring 3.0.3?

I have written a Grails plugin to integrate Spring BlazeDS 1.0.3 and BlazeDS 4 in Grails. It worked great in Grails 1.2.2 but it does not work anymore with Grails 1.3.2 that is based on Spring 3.0.3: when I run the service wizard in Flash Builder, I get a message saying "No destinations configured on server." where it should find 2 destinations.
RDSDispatchServlet is correctly configured and EchoService is annotated as a RemotingDestination and yet it is not visible in Flash Builder.
I don't know where to look, so I've put the project's WAR on my FTP (ftp://ftp.epseelon.org/todolist-0.1.war) in case someone can have a look. The Flash Builder project is there too: ftp://ftp.epseelon.org/todolist-web.fxp

Can anyone have a look and help me identify what the problem is?