GWT allows developers to create responsive web applications using Java instead of JavaScript. It provides a compiler that translates Java code into optimized JavaScript that runs across browsers. This avoids the need for browser-specific code and improves development speed. Some key benefits of GWT include its support for AJAX, local event handling, client-side rendering, dynamic HTML, and Java features like static type checking and JUnit testing. However, it also requires adjusting to its Java-to-JavaScript translation and HTML/CSS abstractions.

1. Introduction to Google Web Toolkit
(GWT)
Ankul Rastogi

2. 
What is GWT ?

Create responsive web application using Java

Create,Test, Debug application in Java

Simple/Rapid Development

AJAX-ification

Why GWT

One technology to rule.Java=Javascript

No more broswer specific code snippets.User friendly
compiler.Write Once Run anywhere

3. AJAX
What is AJAX( Asynchronous JavaScript and
XML)

Doing things in background.

Dynamic HTML(Responsive and reactive)

Client Side Processing

Smart Clients

Single page and multiple UI's.

4. AJAX Flow

5. Problem With JS

Type Checking,bug fixing,debugging.

Poor IDE support

Browser Portability

Speed

No history/BookMarks

Spaghetti code.No OO structure

No Documentation
SOS an AJAX ninja

6. GWT Features

All in Java(Faster Dev/Testing/Debugging/Refactor cycle)

Single CodeBase.Browser agnostic

Optimized and efficient Java-Javascript Compiler

Local Event handling and client side rendering logic.

Compile Time checks(Static Type Checking, Generics)

Dynamic HTML.Async AJAX

7. GWT Features(Cont.)

History,Bookmarking,Validation,MVP,Internationalization,
Junit

Reusable Widgets.Extensible and manageble

Deferred Binding.Code Generation

Dependency Injection

Under the Hood RPC

JSNI

Delarative Layout using XML. Panel based design

Component based design

9. GWT dark side

Change in mindset.

Not everything from Java can be used in GWT.

Learning effort.

HTML CSS abstraction.Tough to visualize your UI

Looking London Talking Tokyo.

Firebug

In process of evolving.

Unit testing not mature.

Not many takers, hence not wide feature set

Disciplined approach to development

10. Concepts

Maven

MVP

Module

RPC

Dev Mode Production Mode Super Dev Mode

UiBinder.Dumb Views

GWT-bootstrap

11. MVC v/s MVP

13. Sample Demo

14. Thank You