It's okay to make this snippet into the ejb-jar.xml:
Maybe everybody forget to mention maybe it's a Glassfish V2 trick that I get this error message during deployment:
Interceptor binding contains an interceptor class name = pkg.IC that is not defined as an interceptor
...unless I register the interceptor class itself too with this:
<interceptors> and <assembly-descriptor> are children of <ejb-jar> element in this order as it seems well in the xsd.