Constructor injection

[David Blevins]

I added constructor injection for EJBs and Interceptors into OpenEJB.   
We could probably do the same for servlets, filters and listeners if  
we use xbean-reflect to create all of those.

The trick would be that the functionality wouldn't work unless they  
compiled the code with debug.  XBean uses the debug table to scrape  
out the constructor param names.  We could potentially add support of  
the @java.beans.ParameterNames annotation, but that's only available  
in Java 6.

Add it? Don't add it?  Add it but put a big disclaimer on the doc for  
it?

Thoughts?

-David