Question : pros and cons of GWT

What is the pros and cons of GWT? Is it a technology that worths to use?

Answer : pros and cons of GWT

GWT Advantages
 
No JavaScript syntax errors
   - Use a reliable, strongly-typed language (Java) for development and debugging
   - No JavaScript programming at all!
 
Can use complex Java on the client
   - Turned into JavaScript, but you still use String, array, Math class, ArrayList, HashMap, custom classes, etc.
   - Full IDE-based Java support for development/debugging (GWT builds Eclipse or MyEclipse projects automatically)
 
 Can send complex Java types to and from the server
    - Data gets serialized across network
 
 Standalone test environment
   - Can test within MyEclipse without installing a server
 
 Support by major company
   - From the company that helped to popularize Ajax in the first place.  But project is free, open-source, and in no way tied to Google products  or services.
   - Company won't go away like perhaps with AjaxTags
 

 
 GWT Disadvantages
 
Big learning curve
   - Java developers can deploy with AjaxTags (or other JSP tag libraries  that wrap Ajax functionality) in just a few minutes, whereas it takes  much longer to get anything running with GWT.
 
 Cumbersome deployment
   - Clumsy and poorly documented process to deploy on a regular Java-based Web server.
 
 Nonstandard approach to integrate JavaScript
   - You never put direct JavaScript in your HTML. Instead, you use JSNI  to wrap JavaScript in Java. Very powerful in the long run, but hard to  get used to at first.
 
 Only for Java developers
   - Most Ajax environments do JavaScript on the client and have a choice for the server. GWT is based entirely around Java.
 
 Unusual approach
   - Fundamentally different strategy than all other Ajax environments makes evaluation and management buyoff harder


and http://aharlamov.blogspot.com/2008/05/gwt