What about Java on Emacs in commercial project?

[Haolin]

Hi, all
I know emacs is a very very good editor, I use it for more than 1 year. 
From now on, I need to migrate from C to Java, for JavaEE development. 
My friends tell me to use eclipse, but I think maybe emacs can do 
everything I want. So I want to know:
Should Emacs be used for production environment? in real commercial 
project with Ejb, Web Service and Jsps? I know I can use Ant or Maven 
instead of eclipse wtp, but should Emacs supply
Grammar Tips and other important features? for example, I add a jar 
package to my classpath of project, should the classes and methods be 
read from emacs?
I tried JDEE, but it looks like a toy and not , maybe it's a good tool, 
but not fit for conmmercial project.

Thanks!

Haolin