ServerConfig.getChannel() doesn't work despite compiling with services-config.xml

I'm developing a pure AS3 application using BlazeDS for backend communication. Currently I'm defining the AMFChannels at runtime using something like this:

var amfChannel:AMFChannel = new AMFChannel("my-amf", "http://127.0.0.1:8400/foo/messagebroker/amf");

Now I want to get rid of this hardcoded configuration. As far as I understood, I just need to compile with -service option including services-config.xml and calling something like this at runtime:

var amfChannel:* = ServerConfig.getChannel("my-amf");

Of course I have a channel with id="my-amf" in services-config.xml, but I keep getting the error message, that the channel is not valid. Indeed the static ServerConfig.xml (which afaik should contain the XML object representing the services-confi开发者_如何学编程g.xml) is empty.

Any ideas?