Yesterday I saw a presentation on Java Server Faces 2.0 which looked truly impressive, even though I am currently a happy ASP.NET MVC / jQuery developer. What I liked most a
JSF has many advantages, question being on disadvantage let me add couple of points on it.
On a practical scenario of implementing a web project with in a time frame you need to keep an eye on the following factors.
Do you have the bandwidth to accommodate the initial learning curve?
Do you have enough expertise in your team who can review the JSF
stuff produces by the developers?
If your answer is 'No' for the questions, you may end up in a non-maintainable codebase.