Do I still need a web application framework if I have ORM already done?

I'm starting my research on web application frameworks and according to what I've read, web application frameworks provide ORM and basic UI's through scaffolding. But I had ORM already done. What other benefits do frameworks provide? do I still need o开发者_JAVA百科ne? or in case not, What other technologies could I use?

I'm working on Java and was considering Grails and GWT. Thanks for your responses!

Depending on the framework you choose, they can provide a number of other benefits in addition to data access:

• Simplified URL configuration
• Templating system for page content
• Security (authentication and/or authorization)
• Methods to streamline Ajax requests/responses
• Use of conventions to reduce/eliminate ugly XML configuration
• Caching mechanisms

Some frameworks provide most all of these things in addition to data access -- Grails, Rails, Django and CakePHP come to mind. Others are primarily concerned with view and controller logic, and do not include a specialized data access component -- GWT, Struts, Spring MVC and Wicket, among many others.

But do you need a framework? It really depends on the scope and constraints of your project. If a framework can eliminate the need for you to custom-develop a few of the items listed above, and you have the time to pick it up and gain the productivity offered, I say go for it.

I'll also say that many jobs prefer or flat-out require experience in certain frameworks. Gaining at least a fundamental knowledge of more frameworks is always a good thing, opporutinistically speaking.

Just put a web front end on your existing persistence tier if you've got it done.