[Zope] Java vs Zope

Good afternoon. I am new to Zope and I am excited about its possibilities. We are an ASP and plan to use Zope to improve our development process. I see that many people use J2EE based environments. Does anyone understand why? Why would anyone use Java? What am I missing? We're ready to go forward with Zope but I fear I might be missing something. Thanks for any opinions!