Java EE (Java Enterprise Edition) General Discussion

Hi There,
Just to get some advice on this one.
I have developed two web applications, one is an admistrative back office type web application that manges products with in a web site.

The second one displays these products on line etc.

My question is, should these applications be two separate ones or should they be one? reason i ask is becuase the front end application could use alot of the code that the back office uses especially with regards the VO and some of the struts actions? What do people think?#
whats the norm for this type of appllication