We have a desktop client application developed in Swing. This application interacts with backend server using Servlet.
The new requirement is to make a web based client. I have read about JavaFX, Flex, ExtJS, etc.
I would like to know which solution is best fit to replace a swing application? Does anyone have any experience of doing the same?
EDIT based on comments
The application is heavy weight in terms of widgets. Ofcourse we will redesign a bit when making a web based client.
You know Swing can run in a web page! There are many other options including PHP, ASP, Ajax etc etc. How "heavy" is the Swing app i.e. are there lots of widgets? This is a very open ended question!
You could consider using the Google Web Toolkit, GWT, to make a web based client. Making a user interface in GWT is somewhat similar to doing it in Java Swing, but the final result is a dynamic web client.
Have a look at SWT
It has a lightweight footprint, a lot of components and it uses the system native render functions for GUI components. There is an extension called "JFace"! It makes SWT development simple.
If you are looking only for Web frameworks, you should start at Grails or Tapestry.
Since you already know Swing and you're supposed to make a web based client/interface, you should consider Apache Wicket which structurally has lots of similarities with Swing (one of its original devs was in a similar situation as you are now).
If you need to have heavyweight functionality which isn't easily done with Ajax and other such web technologies, I'd suggest a combination of Flash/Flex for the UI mainly because there's a lot of people out there who know how to use both of those technologies.
Quick edit: Also see this answer to another question, it may help you understand the real issue at hand a bit better.