In what cases servlets are used?

why i am asking this is we can do everything with jsp what is need of servlet?

In JSP java code is mixed in with HTML. This is probably anacceptable solution for experienced Java developers, but Web designers won't want to have to mess with Java code, nor should they. For small projects, maybe only one person does everything; but for large projects (or Web sites) with hundreds of Web pages, responsibilities are generally divided into Web developers and Java programmers then there is a need of servlets.
Problem 2.
Because JSP pages are translated into servlets, the declaration element is essentially translated into class variables. Thus they have global scope, which is probably not a good thing.
Problem 3.
Database-specific code is in the JSP pages. What happens if the database table is changed to add a column? Someone will now have to go in and modify the JSP pages appropriately. There has to be a better way. i.e.,
not servlets but jsp + servlets.
Message was edited by:
AmitavaDey

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