I am confused in choosing JavaScript Framework for my Project. I can choose any one of the following frameworks........

EXT JS
EXT-GWT
YUI
jQuery
dojo

and many more.......

I don't have any knowledge of any of above all. I am going to start from scratch.
But which one to choose ?

One more thing to mention that I am using J2EE Architecture.

it depends on what u want to achieve

EXt-js - this is for developing javascript widgets (GUIs)
Ext-gwt - this is for java developer who don't want to learn javascript
YUI - general purpose javascript stuff
jQuery - makes it easy to browse your DOM structure
Dojo - some nice javascript tools

if your doing any ajax stuff your best bet would be to use DWR (Direct Web Remoting) its a java framework that makes it easy to interface between your javascript code and your java code

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