When should we use JSP?

Hello!
I have a little general question about JSP because now I'm going to embark upon web development (till today I have been developing native applications). Is JSP used in really big web applications by professionals? I mean, something much bigger than simple forums, rather whole social networkings portals etc? And can JSP fully replace PHP (in practise) in a project or these technologies are rather mixed? Can you give me some examples of web portals developed in JSP? I hesitate between JSP or PHP. I'm familiar with Java and have no experience with PHP. I hope you will help me in making a right decision ;-).
Kind regards,
John.

There are a few big choices for Web development:
- PHP - long the first choice of teenagers and amateurs, recently with version 5 and frameworks like Symfony, it is maturing.
- ASP - the Microsoft solution, easy to use, very little structure. A favorite with small business. Recently ASP.Net has provided objects.
- CGI - used with Perl, this is the grand-daddy of them all, still used, cheap and cheerful, but it doesn't scale well.
- JEE - Java Enterprise, provides more choices than you can shake a stick at, used by well to do amateurs, students, and big corporations. Hosting for JEE is much more expensive than for the first three, but it is much more powerful.
---- JSP - the favorite presentation system for Java servlets. This is a Java version of ASP, by itself it provides little structure
---- Velocity, Webmacro and Freemarker - template engines for Java, often run faster than JSP
---- Struts - Apache's MVC solution, uses JSP or Velocity for presentation
---- Spring MVC - the new system on the block, a big improvement over Struts, still uses JSP and Velocity for presentation
---- JSF - Sun's answer to MVC, a component based system like ASP.Net. Provides rapid development at the cost of being tied to forms and tables. Uses a strange version of JSP for presentation. Don't get me started on <verbatim>.

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