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4.1Available widgets
5Enterprise usage
6GWT 2.0
7Mobile
8See also
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Free Java library
This article contains content that is written like an advertisement. Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view. (October 2019) (Learn how and when to remove this template message)
Google Web ToolkitOriginal author(s)GoogleInitial releaseMay 16, 2006; 17 years ago (2006-05-16)Stable release2.11.0
/ January 9, 2024; 2 months ago (2024-01-09)
Repositorygithub.com/gwtproject/gwt
Written inJavaOperating systemLinux, Windows, MacOS, FreeBSDAvailable inJavaTypeAjax frameworkLicenseApache License 2.0Websitewww.gwtproject.org
Google Web Toolkit (GWT /ˈɡwɪt/), or GWT Web Toolkit,[1] is an open-source set of tools that allows web developers to create and maintain JavaScript front-end applications in Java. It is licensed under Apache License 2.0.[2]
GWT emphasizes reusable approaches to everyday web development tasks, namely asynchronous remote procedure calls, history management, bookmarking, UI abstraction, internationalization, and cross-browser portability.
History[edit]
GWT version 1.0 RC 1 was released on May 16, 2006.[3] Google announced GWT at the JavaOne conference in 2006.[4]
Release history
Release
Date
GWT 1.0
May 17, 2006
GWT 1.1
August 11, 2006
GWT 1.2
November 16, 2006
GWT 1.3
February 5, 2007
GWT 1.4
August 28, 2007
GWT 1.5
August 27, 2008
GWT 1.6
April 7, 2009
GWT 1.7
July 13, 2009
GWT 2.0
December 8, 2009
GWT 2.1.0
October 19, 2010
GWT 2.2.0
February 11, 2011
GWT 2.3.0
May 3, 2011
GWT 2.4.0
September 8, 2011
GWT 2.5.0
October 2012
GWT 2.5.1
March 2013
GWT 2.6.0
January 30, 2014
GWT 2.6.1
May 10, 2014
GWT 2.7.0
November 20, 2014
GWT 2.8.0
October 20, 2016
GWT 2.8.1
April 24, 2017
GWT 2.8.2
October 19, 2017
GWT 2.9.0
May 2, 2020
GWT 2.10.0
June 9, 2022
GWT 2.11.0
January 9, 2024
In August 2010, Google acquired Instantiations,[5] a company known for focusing on Eclipse Java developer tools, including GWT Designer, which is now bundled with Google Plugin for Eclipse.
In 2011 with the introduction of the Dart programming language, Google reassured the GWT community that GWT would continue to be supported for the foreseeable future but also hinted at a possible rapprochement between the two Google approaches to "structured web programming". They've also admitted, however, that several of the engineers previously working on GWT are now working on Dart.[6]
In 2012 at their annual I/O conference, Google announced that GWT would be transformed from a Google project to a fully open-sourced project.[7] In July 2013, Google posted on its GWT blog that the transformation to an open-source project was complete.[8]
Development with GWT[edit]
Using GWT, developers have the ability to develop and debug Ajax applications in the Java language using the Java development tools of their choice. When the application is deployed, the GWT cross-compiler translates the Java application to standalone JavaScript files that are optionally obfuscated and deeply optimized. When needed, JavaScript can also be embedded directly into Java code using Java comments.[9]
GWT does not revolve only around user interface programming; it is a broad set of tools for building high-performance client-side JavaScript functionality. Indeed, many vital architectural decisions are left entirely to the developer. The GWT mission statement[10] clarifies the philosophical breakdown of GWT's role versus the developer's role. History is an example of such: although GWT manages history tokens as users click Back or Forward in the browser, it does not prescribe how to map history tokens to an application state.
GWT applications can be run in two modes:
Development mode (formerly Hosted mode): The application runs as Java bytecode within the Java Virtual Machine (JVM).[11] This mode is typically used for development, supporting the hot swapping of code and debugging. In 2014, the classic implementation of Dev Mode was rendered unusable by browser updates[12][13] until its replacement with the more compatible Super Dev Mode, which became the default in GWT 2.7.[14]
Production mode (formerly Web mode): The application is run as pure JavaScript and HTML, compiled from the Java source. This mode is typically used for deployment.
Several open-source plugins are available for making GWT development easier with other IDEs, including GWT4NB[15] for NetBeans, Cypal Studio for GWT[16] (an Eclipse plugin), and GWT Developer for JDeveloper. The Google Plugin for Eclipse handles most GWT-related tasks in the IDE, including creating projects, invoking the GWT compiler, creating GWT launch configurations, validation, and syntax highlighting.
Components[edit]
The major GWT components include:
GWT Java-to-JavaScript Compiler[17][18]
Translates the Java programming language to the JavaScript programming language.
GWT Development Mode
Allows the developers to run and execute GWT applications in development mode (the app runs as Java in the JVM without compiling to JavaScript). Prior to 2.0, GWT hosted mode provided a special-purpose "hosted browser" to debug your GWT code. In 2.0, the web page being debugged is viewed within a regular browser. Development mode is supported by using a native-code plugin called the Google Web Toolkit Developer Plugin for many popular browsers.
JRE emulation library
JavaScript implementations of the commonly used classes in the Java standard class library (such as most of the java.lang package classes and a subset of the java.util package classes).
GWT Web UI class library
A set of custom interfaces and classes for creating widgets.
Features[edit]
Dynamic and reusable UI components: programmers can use pre-designed classes to implement otherwise time-consuming dynamic behaviors, such as drag-and-drop or sophisticated visual tree structures.[19]
Simple RPC mechanism
Browser history management
Support for full-featured Java debugging[4]
GWT handles some cross-browser issues for the developer.[4]
Unit testing integration
Support for Internationalization and localization
HTML Canvas support (subject to API changes)[20]
The developers can mix handwritten JavaScript in the Java source code using the JavaScript Native Interface (JSNI).
Support for using Google APIs in GWT applications (initially, support for Google Gears).
Open-source
The developers can design and develop their applications in a pure object-oriented fashion since they're using Java (instead of JavaScript).[19] Common JavaScript errors, such as typos and type mismatches, are caught at compile time.
The JavaScript that the GWT compiler generates can be tailored to be either unobfuscated (Source-Mapped or Source-Code) and easier to understand or obfuscated and compressed.[19]
A number of libraries are available for GWT, by Google and third parties. These extend the toolkit's features.[19]
Available widgets[edit]
As of version 2.4 (September 2011), Google Web Toolkit offers several widgets[21] and panels.[21]
Widgets and panels
Widgets
Panels
Button
PopupPanel
PushButton
StackPanel
RadioButton
StackLayoutPanel
CheckBox
HorizontalPanel
DatePicker
VerticalPanel
ToggleButton
FlowPanel
TextBox
VerticalSplitPanel
PasswordTextBox
HorizontalSplitPanel
TextArea
SplitLayoutPanel
Hyperlink
DockPanel
ListBox
DockLayoutPanel
CellList
TabPanel
MenuBar
TabLayoutPanel
Tree
DisclosurePanel
CellTree
SuggestBox
RichTextArea
FlexTable
Grid
CellTable
CellBrowser
TabBar
DialogBox
Many common widgets not found in the GWT have been implemented in third-party libraries.
Enterprise usage[edit]
GWT uses or supports Java, Apache Tomcat (or similar web container), Eclipse IDE, Internet Explorer,[22] and internationalization and localization. Java-based GWT rich web applications can be tested using JUnit testing framework and code coverage tools. Because GWT allows compile time verification of images, CSS, and business logic, many common development defects are automatically discovered without requiring the manual testing commonly required by RIAs.
Google has noted that some of its products are GWT-based:[23] Blogger, AdWords, Flights, Wallet, Offers, Groups, Inbox.[24]
GWT 2.0[edit]
On December 8, 2009, Google launched Google Web Toolkit 2.0 with Speed Tracer.[25]
Version 2.0 of GWT offers a number of new features,[26] including:
In-Browser Development Mode (formerly known as Out Of Process Hosted Mode, OOPHM): prior to version 2.0, the hosted mode was used to embed a modified browser to allow running the bytecode version of the application during development. With version 2.0, hosted mode, renamed "development mode", allows using any (supported) browser to view the page being debugged through the use of a browser plugin. The plugin communicates with the development mode shell using TCP/IP, which allows cross-platform debugging (for example, debugging in Internet Explorer on Windows from a development mode shell running on a Linux machine).
Code splitting: with the developer providing "split points" in the source code, the GWT compiler can split the JavaScript code into several small chunks instead of one big download. This will lead to reduced application startup time as the size of the initial download is decreased.
Declarative User Interface: using an XML format, the new feature known as UiBinder allows the creation of user interfaces through declaration rather than code. This allows a clean separation of UI construction and behavior implementation.
Resource bundling: the ClientBundle interface will allow resources of any nature (images, CSS, text, binary) to be bundled together and transferred in one download, resulting in fewer round-trips to the server and hence lower application latency.
Since the new development mode removed most platform-specific code, the new version will be distributed as a unique archive, instead of one per supported platform, as was the case with previous versions.
Mobile[edit]
As a general framework for making web apps, Google Web Toolkit is also capable of being used as a framework for creating mobile and tablet apps, either by making the needed widgets and animations from scratch or by using one of the mobile frameworks for GWT. An HTML5 app written in GWT can have separate views for Tablets and Mobile phones.
See also[edit]
Free and open-source software portalComputer programming portal
Dart (programming language)
Google Plugin for Eclipse
Google Code
Comparison of JavaScript-based web frameworks
Comparison of web frameworks
Emscripten for converting C++ into JavaScript or WebAssembly
RAS syndrome
References[edit]
^ "GWT Name Use Policy". Retrieved April 23, 2014.
^ "Google Web Toolkit License Information". February 23, 2007. Retrieved September 25, 2007.
^ "Google Web Toolkit Release Archive". Retrieved September 25, 2007.
^ a b c Olson, Steven Douglas (2007). Ajax on Java. O'Reilly. p. 183. ISBN 978-0-596-10187-9.
^ Ramsdale, Chris. "Google Relaunches Instantiations Developer Tools".
^ "Google Web Toolkit Blog: GWT and Dart". Googlewebtoolkit.blogspot.com. November 10, 2011. Retrieved June 16, 2013.
^ Vaadin to Support Google Web Toolkit (GWT) Development. vaadin.com (June 29, 2012). Retrieved on 2014-05-15.
^ Google Web Toolkit Blog: GWT News. Googlewebtoolkit.blogspot.com (July 15, 2013). Retrieved on 2014-05-15.
^ "Coding Basics - JavaScript Native Interface (JSNI) - Google Web Toolkit — Google Developers". Google Inc. October 25, 2012. Retrieved June 16, 2013.
^ GWT mission statement
^ Debugging in Development Mode
^ "Development Mode will not be supported in Firefox 27+". google-web-toolkit@googlegroups.com (Mailing list).
^ "GWT Developer Plugin no longer works with Chrome on Linux". google-web-toolkit@googlegroups.com (Mailing list).
^ "Super Dev Mode".
^ GWT4NB
^ Cypal Studio for GWT
^ "com.google.gwt.dev.Compiler". GitHub. The main executable entry point for the GWT Java to JavaScript compiler.
^ "com.google.gwt.dev.jjs.JavaToJavaScriptCompiler". GitHub. A base for classes that compile Java JProgram representations into corresponding Js source.
^ a b c d Perry, Bruce W (2007). Google Web Toolkit for Ajax. O'Reilly Short Cuts. O'Reilly. pp. 1–5. ISBN 978-0-596-51022-0.
^ "GWT Javadoc Canvas".
^ a b "Widget List". Google Inc. Retrieved May 21, 2012.
^ GWT Project. GWT Project. Retrieved on May 15, 2014.
^ "Google I/O 2012 - The History and Future of Google Web Toolkit". GoogleDevelopers. Retrieved March 18, 2013.
^ Toubassi, Garrick. "Going under the hood of Inbox". Official Gmail Blog. Retrieved November 22, 2014.
^ Introducing Google Web Toolkit 2.0, now with Speed Tracer
^ "GWT 2.0 milestone 1 announcement". Amit Manjhi. Retrieved October 5, 2009.
Bibliography[edit]
Dewsbury, Ryan (December 15, 2007). Google Web Toolkit Applications. Prentice Hall. p. 608. ISBN 978-0-321-50196-7.
Chaganti, Prabhakar (February 15, 2007). Google Web Toolkit: GWT Java Ajax Programming. Packt Publishing. p. 248. ISBN 978-1-84719-100-7.
Geary, David (November 17, 2007). Google Web Toolkit Solutions: More Cool & Useful Stuff. Prentice Hall. p. 408. ISBN 978-0-13-234481-4.
Hanson, Robert; Adam Tacy (February 7, 2013). GWT in Action (2nd ed.). Manning. p. 643. ISBN 978-1-935182-84-9.
Cooper, Robert; Charlie Collins (May 12, 2008). GWT in Practice. Manning. p. 376. ISBN 978-1-933988-29-0.
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Developer’s GuideWelcome to the GWT Developer’s Guide. This guide introduces the key concepts, tools, and libraries you’ll encounter when building web applications with GWT. The topics in this guide span project organization, coding, debugging, testing, optimizing, and publishing your web application.Note - If you’re new to GWT and eager to start playing immediately, you might want to try the Quick Start. For specific technical details, see the Reference guide and Articles.Tutorials
Create, build and run a GWT application – Create, build, debug and compile a sample application.
Communicating with the server – Add an asynchronous call to a web server using GWT RPC or JSON, serialize Java objects, and handle exceptions
Internationalizing a GWT application – Translate the user interface of a GWT application into another language
Unit testing with JUnit – Add unit tests to a GWT application using JUnit
Deploying to Google App Engine – Deploy a GWT application to App Engine
Developer Guide
Organize Projects – Describes conventions to identify which code is intended to run on the client browser, the server, or both
Compile & Debug – Describes development and production modes
Coding Basics – Describes GWT programming fundamentals
Build User Interfaces – How to work with widgets, panels, the DOM, events, CSS, declarative UI and images. Cell widgets / Editors - 2.1, Cell tables - 2.2
HTML5 Feature Support 2.3 – Describes GWT support for HTML5 features, such as Storage, Canvas, Audio, Video, drag and drop, and so forth.
Security for GWT Applications - How to secure your GWT applications against JavaScript attacks
Security: Safe HTML 2.1 – Describes coding guidelines that prevent a large class of Cross-Site-Scripting (XSS) vulnerabilities
Security: GWT RPC XSRF protection 2.3 – Describes how to prevent Cross-Site Request Forgery (XSRF or CSRF) vulnerabilities in GWT RPCs
MVP Framework 2.1 – Sample app and documentation showing how to use Activities, Places, and the EventBus.
RequestFactory 2.1 – Guide to creating data-oriented services using RequestFactory and EntityProxy classes.
Logging 2.1 – Describes how to log events in client-side code in GWT applications.
Accessibility 2.5 – Describes features that enable screen readers to interpret what is displayed on the screen for a visually impaired user
Internationalization – Describes a flexible set of tools to help you internationalize your applications and libraries
Communicate with a Server – Describes a couple of different ways to communicate with a server via HTTP
Test with JUnit – Describes how to use the JUnit unit testing framework and Emma code coverage tool
Deploy – Describes how to deploy both client- and server-side JavaScript
Optimize – Describes how to improve the performance of your application
IE9 Support - Tips and Tricks 2.3 - Support for Internet Explorer 9
Reference – Provides javadoc for GWT and related libraries and technical details for GWT widgets
FAQ – Frequently asked questions
Glossary – GWT terminology
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Introduction
Create
Design
Build the UI
Manage Events
Coding Client side
Debugging
Styling
Compilation
AJAX Communication
Introduction
Using GWT RPC
Retrieving JSON
Cross-site Requests
JSON php
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GWT & Polymer
Create Project
Opt A: Widgets UI
Build the UI
Events & Logic
Opt B: Elements UI
Build the UI
Events & Logic
Documentation
Overview
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Introduction
Organize Projects
Compile & Debug
Client-side
JRE Compatibility
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History Mechanism
Formatting
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JavaScript: JSNI
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Build User Interfaces
Contents
Cross-Browser Support
Layout with Panels
Widgets
Custom Widgets
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Html5 Storage
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Introduction
Locale
Constants
Messages
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Overview
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Contents
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Overview
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>Back to GWT homepage
Menu
Get Started
Overview
SDK Learn More
Configure Eclipse
Configure IntelliJ
Tutorials
Overview
Build a GWT App.
Introduction
Create
Design
Build the UI
Manage Events
Coding Client side
Debugging
Styling
Compilation
AJAX Communication
Introduction
Using GWT RPC
Retrieving JSON
Cross-site Requests
JSON php
Internationalization
JUnit Testing
Deploy to GAE
GWT & Polymer
Create Project
Opt A: Widgets UI
Build the UI
Events & Logic
Opt B: Elements UI
Build the UI
Events & Logic
Documentation
Overview
Coding Basics
Introduction
Organize Projects
Compile & Debug
Client-side
JRE Compatibility
Ajax Communication
History Mechanism
Formatting
Delayed Logic
Working with JSON
Working with XML
JavaScript: JSNI
JavaScript: JsInterop
Overlay Types
Deferred Binding
Build User Interfaces
Contents
Cross-Browser Support
Layout with Panels
Widgets
Custom Widgets
Cell Widgets
Cell Tables
Custom Cells
Editors
Using the DOM
Events & Handlers
Css Styling
UIBinder
Image Bundles
Html5 Support
Contents
Html5 Storage
Test with JUnit
Guide
HtmlUnit
Remote Testing
Code Coverage
Deploy
Advanced Topics
Logging
Security
Contents
Using SafeHtml
XSRF Protection
AutoBeans
Request Factory
Activities And Places
Validation
Internationalization
Introduction
Locale
Constants
Messages
Plural Forms
UI Binder
Accessibility
Optimize
Overview
Code Splitting
Compile Report
Client Bundle
GSS vs CSS Syntax
Lightweight Metrics
Linkers
Reference
Command Line Tools
GWT Class API
Jre Emulation
Widgets Gallery
FAQ
Contents
Getting Started
Debug & Compile
Build UI
Client
Server
Troubleshooting
Glossary
Resources
Examples
Presentations
Articles
Overview
GSS Migration
Fragment Merging
Super Dev Mode
Elemental
Dynamic Host Page
Building MVP apps
MVP Part I
MVP Part II
GWT & Hibernate
Testing
DOM Memory Leaks
Security
JSON & Mashups
GWT iPhone
Books
Case Studies
Community
Community & Forums
Community Group
Developer Spotlight
Making GWT Better
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Life of an Issue
Steering Committee
Meeting Notes
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GWT License
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Search
OverviewGWT is a development toolkit for building and optimizing complex browser-based applications. Its goal is to enable productive development of high-performance web applications without the developer having to be an expert in browser quirks, XMLHttpRequest, and JavaScript. It’s open source, completely free, and used by thousands of developers around the world.What’s New in GWT 2.11.0What’s inside the toolbox?SDKThe GWT SDK contains the Java API libraries, compiler, and development server. It lets you write client-side applications in Java and deploy them as JavaScript.
Get Started
Tutorials
Developer Guide
Plugin for EclipseThe Plugin for Eclipse provides IDE support for GWT and App Engine web projects.
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Developing with GWT WriteThe GWT SDK provides a set of core Java APIs and Widgets. These allow you to write AJAX applications in Java and then compile the source to highly optimized JavaScript that runs across all browsers, including mobile browsers for Android and the iPhone.Constructing AJAX applications in this manner is more productive thanks to a higher level of abstraction on top of common concepts like DOM manipulation and XHR communication.You aren’t limited to pre-canned widgets either. Anything you can do with the browser’s DOM and JavaScript can be done in GWT, including interacting with hand-written JavaScript. DebugYou can debug AJAX applications in your favorite IDE just like you would a desktop application, and in your favorite browser just like you would if you were coding JavaScript. The GWT developer plugin spans the gap between Java bytecode in the debugger and the browser’s JavaScript.Thanks to the GWT developer plugin, there’s no compiling of code to JavaScript to view it in the browser. You can use the same edit-refresh-view cycle you’re used to with JavaScript, while at the same time inspect variables, set breakpoints, and utilize all the other debugger tools available to you with Java. And because GWT’s development mode is now in the browser itself, you can use tools like Firebug and Inspector as you code in Java. OptimizeGWT contains two powerful tools for creating optimized web applications. The GWT compiler performs comprehensive optimizations across your codebase — in-lining methods, removing dead code, optimizing strings, and more. By setting split-points in the code, it can also segment your download into multiple JavaScript fragments, splitting up large applications for faster startup time.Performance bottlenecks aren’t limited to JavaScript. Browser layout and CSS often behave in strange ways that are hard to diagnose. Speed Tracer is a new Chrome Extension in GWT that enables you to diagnose performance problems in the browser. RunWhen you’re ready to deploy, GWT compiles your Java source code into optimized, stand-alone JavaScript files that automatically run on all major browsers, as well as mobile browsers for Android and the iPhone.Ready to get started?Download the SDK and get a simple web application up and running. From there, work through the fundamentals of GWT development with the in-depth tutorials.
What is Google Web Toolkit? - Google Developers Help
is Google Web Toolkit? - Google Developers Help Skip to main content Google Developers HelpSign inGoogle HelpHelp CenterGoogle DevelopersPrivacy PolicyTerms of ServiceSubmit feedback Send feedback on...This help content & informationGeneral Help Center experienceNextGoogle DevelopersGoogle Web Toolkit (GWT)Getting StartedWhat is Google Web Toolkit? What is Google Web Toolkit?Google Web Toolkit (GWT) is an open source Java software development framework that makes writing AJAX applications easy. With GWT, you can develop and debug AJAX applications in the Java language using the Java development tools of your choice. When you deploy your application to production, the GWT compiler translates your Java application to browser-compliant JavaScript and HTML. true Getting Started1 of 15Where can I find the Developer Guide?2 of 15What is Google Web Toolkit?3 of 15How does Google Web Toolkit work?4 of 15How do I install Google Web Toolkit?5 of 15Can I use Google Web Toolkit to develop commercial applications? What about enterprise applications?6 of 15Is Google Web Toolkit available in my country? Does it work for my language?7 of 15Does Google Web Toolkit cost anything?8 of 15Really? Free? Why is Google giving this away?9 of 15How will Google release new versions of Google Web Toolkit? If my app depends on an older version of GWT, will I have to upgrade?10 of 15What are the system requirements for Google Web Toolkit?11 of 15Does Google Web Toolkit send any information about me back to Google's servers?12 of 15Does Google Web Toolkit have a blog?13 of 15My company wrote a tool that depends on the GWT compiler. Can I redistribute the GWT binaries with my product?14 of 15Where can I find the GWT source code? Can I submit a patch?15 of 15Who do I contact if I have questions? ©2024 Google Privacy Policy Terms of Service Enable Dark Mode Send feedback on... This help content & information General Help Center experience Google appsMain menu 14710141127927295851 true Search Help Center true true true false falGWT Tutorial
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Google Web Toolkit (GWT) is a development toolkit for building and optimizing complex browser-based applications. GWT is used by many products at Google, including Google AdWords and Orkut. GWT is an open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0. This tutorial will give you a great understanding of GWT concepts needed to get a web application up and running.
Audience
This tutorial is designed for software professionals who are willing to learn GWT programming in simple and easy steps. This will also give you great understanding on GWT Programming concepts.
After completing this tutorial, you will be at intermediate level of expertise from where you can take yourself at higher level of expertise.
Prerequisites
Before proceeding with this tutorial, you should have a basic understanding of Java programming language, text editor, and execution of programs, etc. Because we are going to develop web-based applications using GWT, it will be good if you have an understanding of other web technologies such as HTML, CSS, and AJAX.
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What is Google Web Toolkit(GWT)? - GeeksforGeeks
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What is Google Web Toolkit(GWT)?
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Google Web Toolkit (GWT) is an open-source web application framework developed by Google. It is a Java-based framework that allows developers to write web applications in Java and compile the code to highly optimized JavaScript, HTML, and CSS. The framework was first released in 2006 and has since become a popular choice for developers who want to build large, scalable, and maintainable web applications. Additionally, GWT offers a comprehensive selection of user interface elements and makes it simple for developers to build complex and sophisticated web applications with ease.
Features of GWT
GWT has a number of features that make it a popular choice for web developers. Here are some of the key features of GWT:
Rich User Interface Components: GWT provides a rich set of user interface components, including buttons, text boxes, menus, and more. These components are customizable and can be easily integrated into your web application.Cross-Browser Compatibility: GWT generates optimized JavaScript code that is compatible with all major web browsers, including Chrome, Firefox, and Safari.RPC Mechanism: GWT includes a built-in RPC mechanism that allows developers to easily communicate between the client-side and server-side of their web application.Internationalization: GWT provides support for internationalization, which allows developers to create applications that can be easily translated into different languages and adapted to different regions and cultures. By using `Constants` and `Messages` interface property files, and the `LocaleInfo` class, one can create applications for different regions.Development Mode: GWT includes a development mode that allows developers to test their applications without deploying them to a web server. This can save a lot of time during the development process.Components of GWT
Components in GWT can be breakdown into 4 parts:
1. Java to JavaScript Compiler
This creates a JavaScript equivalent for the Java programming language. It works by analyzing the Java source code, followed by generating JavaScript files. During the compilation process, the GWT compiler optimizes the generated code for performance, removes unused code, and minimizes the size of the output files to reduce the download time.
2. GWT Development Mode
This enables the execution of GWT apps in development mode (the program runs in the JVM as Java rather than compiling to JavaScript). Before version 2.0, GWT-hosted mode had a dedicated “hosted browser” to help you debug your GWT code. In version 2.0, a standard browser is used to see the web page that is being debugged. For several well-known browsers, a native-code plugin called the Google Web Toolkit Developer Plugin supports development mode.
3. JRE Emulation Library
JavaScript implementations of the most frequently employed classes from the Java standard class library, comprising the majority of the classes found in java.lang package and a portion of the classes in java.util package.
4. GWT Web UI class library
It is a set of pre-built widgets and components that are used to create widgets such as history management, UI components, etc. It includes components such as labels, buttons, text boxes, tables, and menus. Since these components are built on top of the GWT framework, they are cross-compatible and work seamlessly across all browsers.
Why use GWT?
The following are some of the reasons, why one should use GWT:
Easy for developers to design: Extensible Markup Language (XML), HyperText Markup Language (HTML), Cascading Style Sheets (CSS), and Java are all easily bound by GWT, which makes it easier for developers to quickly design, develop, and deploy complex applications.Offers a library of widgets: Additionally, GWT offers a library of widgets and panels that can be utilized directly with a few adjustments.Compatibility with IDEs: Since GWT is based on Java, applications can be built, developed, and debugged on IDEs on which Java runs, for example, Eclipse IDE, IntelliJ IDEA, etc.Includes Java-to-Javascript Compiler: As GWT includes a Java-to-Javascript compiler to produce browser-specific Javascript code, developers are not required to create Javascript code.Breakdown of GWT
The breakdown of a typical GWT application can be described as follows:
Entry point class: Every GWT application has an entry point class that serves as the starting point for the application. This class extends the GWT EntryPoint interface and contains the main() method, which is called when the application is loaded in the browser.User interface (UI): The UI of a GWT application is created using GWT widgets, which are a set of pre-built user interface components that can be customized and combined to create complex user interfaces. GWT provides a wide range of widgets, including buttons, text boxes, tables, and panels, among others.Event handling: GWT uses the concept of event handling to respond to user interactions with the UI. Events are created using the GWT Event class and are handled using event listeners.Communication with the server: GWT makes it easy to communicate with the server-side code using AJAX (Asynchronous JavaScript and XML) requests. This allows the application to update the UI without refreshing the page.MVP architecture: GWT applications typically follow the Model-View-Presenter (MVP) architecture pattern. The Model represents the data, the View represents the UI, and the Presenter acts as the mediator between the two, handling all the business logic.Compilation: GWT applications are compiled into JavaScript and HTML code that can be deployed to a web server and accessed by users via a web browser. Widgets
Widgets in GWT are a set of pre-built user interface components that can be customized and combined to create complex user interfaces. GWT provides a wide range of widgets, including buttons, text boxes, tables, and panels, among others. Here’s a table that lists some of the most commonly used widgets in GWT:
WidgetDescriptionButtonA clickable button that can trigger actions or events.TextBoxA text input field where users can enter text.TextAreaA larger text input field that can handle multiple lines.ListBoxA drop-down list of selectable options.CheckBoxA checkbox that can be checked or unchecked.RadioButtonA set of mutually exclusive radio buttons.LabelA simple text label that displays text.HTMLA widget that displays HTML-formatted text or images.ImageA widget that displays an image.TabPanelA panel that can contain multiple tabs of content.HyperlinkA clickable hyperlink that can lead to other pages or actions.FlexTableA table with a flexible layout that can be dynamically updated.VerticalPanelA panel that arranges widgets vertically.HorizontalPanelA panel that arranges widgets horizontally.
These are just a few examples of the many widgets available in GWT. Developers can also create their own custom widgets by extending the GWT Widget class and implementing their own logic and functionality.
Application Development Process
First, to use GWT in your project, you need to download the SDK.
Step 1: Go to the official website at https://gwtproject.org/ and click on the “Download” button. This will take you to a page where you can choose the version of GWT you want to download.
Step 2: Once you have downloaded the zip file, extract it to a directory on your local machine. From there, you can use the GWT compiler to build your application.
Contents of the zip file, after extracting it.
Once you are done with downloading and extracting the SDK, you can use it in an IDE of your choice. Here, IntelliJ IDEA will be used.
Step 3: Open IntelliJ IDEA and go to File > Settings (or press Ctrl + Alt + S on Windows, or Command +, on macOS).
Step 4: In the Settings window, navigate to Plugins and click on the Marketplace tab.
Step 5: Search for “GWT-Platform(GWTP) IntelliJ IDEA” in the search bar and select “GWT-Platform(GWTP) IntelliJ IDEA” from the list of plugins.
Step 6: Click on the Install button and follow the prompts to install the plugin.
Step 7: After the installation is complete, restart IntelliJ IDEA.
Step 8: Once IntelliJ IDEA has restarted, create a new project and select “GWTP” from the list of available options under Generators.
Step 9: Follow the prompts to set up your project and configure GWT.
Step 10: You may add a new ArtifactId, GroupId, and Module or leave it as default.
Step 11: Once your project is set up, you can start using GWT in your code. This plugin will allow you to create GWT modules, which are the building blocks of your GWT application.
Benefits of GWTJava-Based Development: One of the major advantages of GWT is that it allows developers to write web applications in Java, a popular and widely used programming language. This makes it easy for developers who are familiar with Java to learn and use GWT.Cross-Platform Compatibility: GWT supports cross-platform development, allowing developers to write applications that work seamlessly across multiple web browsers and devices. This means that developers can write code once and have it work on different platforms without having to worry about compatibility issues.Robust User Interface: GWT provides a rich set of pre-built widgets and components that can be customized and combined to create robust and responsive user interfaces. This makes it easy for developers to create complex UIs that are both intuitive and easy to use.Seamless Integration with Other Google Services: GWT is part of the Google Cloud Platform, which means it can easily integrate with other Google services like Google App Engine and Google Cloud Storage. This makes it easy to develop, deploy, and scale web applications using Google’s cloud infrastructure.Productivity Tools: GWT includes a number of productivity tools, including the GWT Designer visual layout tool, which makes it easy to design and layout user interfaces using drag-and-drop functionality. Additionally, GWT’s compiler and debugging tools help developers identify and fix errors quickly and efficiently.Community Support: GWT has a large and active community of developers who contribute to the development of the framework and provide support to other developers. This means that developers can find answers to their questions and get help with their projects from a wide range of sources.Limitations of GWTSteep Learning Curve: While GWT is based on Java, which is a widely-used programming language, it can still have a steep learning curve for developers who are not familiar with the framework. Developers may need to spend time learning how to use GWT’s APIs, widgets, and tools before they can develop applications efficiently.Limited Flexibility: While GWT provides a rich set of pre-built widgets and components, it may not be as flexible as some other web development frameworks. Developers may find it challenging to customize the pre-built components to meet specific requirements or to integrate other third-party libraries into their GWT application.Compilation Time: GWT applications need to be compiled into JavaScript before they can be run in the browser. Depending on the size and complexity of the application, compilation can take a significant amount of time, which can slow down the development process.Debugging: Debugging GWT applications can be more challenging than debugging traditional Java applications. Developers may need to use specialized tools to debug their applications, which can be more time-consuming and require additional effort.Limited Community Support: While GWT has a large and active community, it may not be as extensive as some other web development frameworks. This can make it more difficult for developers to find answers to their questions or to get support for their projects.
Overall, GWT is an excellent choice for developers who want to build complex, scalable, and maintainable web applications. With its cross-browser compatibility, built-in RPC mechanism, an extensive set of UI widgets, and support for internationalization, GWT is a popular choice for web developers looking to create robust and scalable web applications. It also provides a robust development environment with debugging and profiling tools that allow developers to easily test and optimize their applications.
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mainBranchesTagsGo to fileCodeFolders and filesNameNameLast commit messageLast commit dateLatest commit History9,475 Commits.github.github build_toolsbuild_tools dev-extdev-ext devdev distro-sourcedistro-source docdoc eclipseeclipse mavenmaven requestfactoryrequestfactory samplessamples servletservlet toolstools useruser .gitignore.gitignore CONTRIBUTING.mdCONTRIBUTING.md README.mdREADME.md WORKSPACEWORKSPACE build.xmlbuild.xml common.ant.xmlcommon.ant.xml platforms.ant.xmlplatforms.ant.xml View all filesRepository files navigationREADMEGWT
GWT is the official open source project for GWT releases 2.5 and onwards.
In this document you have some quick instructions to build the SDK from
source code and to run its tests.
For a more detailed documentation visit our web site.
If you are interested in contributing with the project, please read the
Making GWT better
section.
Building the GWT SDK:
In order to build GWT, java and ant are required in your system.
You need the GWT tools repository
checked out and up-to-date. By default it is expected to be found at ../tools.
You can override the default location using the GWT_TOOLS environment variable
or passing -Dgwt.tools= argument to ant.
To create the SDK distribution files run:
$ ant clean dist-dev
Then you will get all .jar files in the folder build/lib and
the redistributable file will be: build/dist/gwt-0.0.0.zip
if you want to specify a different version number run:
$ ant clean dist-dev -Dgwt.version=x.x.x
To compile everything including examples you have to run
$ ant clean dist
To create maven artifacts (after building .jar using ant), use following guide.
How to verify GWT code conventions:
In GWT we have some conventions so as all code written
by contributors look similar being easier to review.
After you make any modification, run this command to compile
everything including tests, to check APIs, and to verify code style.
It shouldn't take longer than 3-4 minutes.
$ ant compile.tests apicheck checkstyle
How to run GWT tests
Previously to run any test you have to set some environment variables
to guarantee that they are run in the same conditions for all
developers.
In a Unix like platform you can use the export command:
$ export TZ=America/Los_Angeles ANT_OPTS=-Dfile.encoding=UTF-8
But in Windows™ you have to set the time-zone in your control panel, and
the environment variables using the command set.
Finally you can run all test suites with the following command, but be
prepared because it could take hours, and probably it would fail because
of timeouts, etc.
$ ant test
Thus, you might want to run only certain tests so as you can
focus on checking the modifications you are working on.
GWT build scripts use specific ant tasks and a bunch of system
properties listed in the following table to specify which tests
to run and how.
For instance to run the task test in the module user you
have to change to the user folder and run ant with the task
as argument, adding any other property with the -D flag:
$ ( cd user && ant test -Dtest.emma.htmlunit.disable=true ; cd .. )
Module
Task
Property to skip
Description
dev
test
test.dev.disable
GWT compiler & dev libraries
codeserver
test
test.codeserver.disable
SuperDevMode server
user
test
test.user.disable
GWT user API and JRE emulation
user
test.nongwt
test.nongwt.disable
Run tests that not require GWTTestCase
user
test.dev.htmlunit
test.dev.htmlunit.disable
Run dev-mode tests with HtmlUnit
user
test.web.htmlunit
test.web.htmlunit.disable
Run web-mode tests with HtmlUnit
user
test.draft.htmlunit
test.draft.htmlunit.disable
Run draft compiled HtmlUnit tests
user
test.nometa.htmlunit
test.nometa.htmlunit.disable
Run -XdisableClassMetadata tests with HtmlUnit
user
test.emma.htmlunit
test.emma.htmlunit.disable
Run emma tests with HtmlUnit
user
test.coverage.htmlunit
test.coverage.htmlunit.disable
Run tests for coverage support
user
test.dev.selenium
test.dev.selenium.disable
Run dev-mode tests using Selenium RC servers
user
test.web.selenium
test.web.selenium.disable
Run web tests using Selenium RC servers
user
test.draft.selenium
test.draft.selenium.disable
Run draft compiled tests using Selenium RC servers
user
test.nometa.selenium
test.nometa.selenium.disable
Run -XdisableClassMetadata tests using Selenium RC servers
user
test.emma.selenium
test.emma.selenium.disable
Run emma tests with Selenium RC servers
requestfactory
test
test.requestfactory.disable
Request Factory library
tools
test
test.tools.disable
Some tools used in GWT development
Additionally you can utilize some variables to filter which test to run in each task:
Module
Task
Properties
Default
dev/core
test
gwt.junit.testcase.dev.core.includes
**/com/google/**/*Test.class
gwt.junit.testcase.dev.core.excludes
user
test
gwt.junit.testcase.includes
**/*Suite.class
user
test.nongwt
gwt.nongwt.testcase.includes
**/*JreSuite.class
gwt.nongwt.testcase.excludes
user
test.web.* test.draft.* test.nometa.*
gwt.junit.testcase.web.includes
**/*Suite.class
gwt.junit.testcase.web.excludes
**/*JsInteropSuite.class,**/*JreSuite.class,***/OptimizedOnly*
user
test.dev.* test.emma.*
gwt.junit.testcase.dev.includes
**/*Suite.class
gwt.junit.testcase.dev.excludes
**/*JsInteropSuite.class,**/*JreSuite.class,***/OptimizedOnly*
Examples
Run all tests in dev
$ ( cd dev && ant test ; cd .. )
Note: that the last `cd ..' is only needed in Windows.
There is another option to do the same but without changing to the
module folder. We have to specify the module as the ant task, and
the task as a target argument.
$ ant dev -Dtarget=test
Run all tests in codeserver
$ ( cd dev/codeserver && ant test )
or
$ ant codeserver -Dtarget=test -Dtest.dev.disable=true
Note: that we disable dev tests because code server depends on dev
and we don`t want to run its tests.
Run all tests in tools
$ ant tools -Dtarget=test -Dtest.dev.disable=true -Dtest.user.disable=true
Run only the JsniRefTest in dev
$ ant dev -Dtarget=test \
-Dgwt.junit.testcase.dev.core.includes="**/JsniRefTest.class"
Run a couple of tests in dev
$ ant dev -Dtarget=test \
-Dgwt.junit.testcase.dev.core.includes="**/JsniRefTest.class,**/JsParserTest.class"
Note: that you have to use regular expressions separated by comma to
select the test classes to execute.
Run all Jre tests in user, they should take not longer than 3min.
We have two ways to run them. Although the second case is more
complex it is here to know how disable properties work.
$ ( cd user && ant test.nongwt )
or
$ ant user -Dtarget=test
-Dtest.dev.disable=true \
-Dtest.codeserver.disable=true \
-Dtest.requestfactory.disable=true \
-Dtest.tools.disable=true \
-Dtest.dev.htmlunit.disable=true \
-Dtest.web.htmlunit.disable=true \
-Dtest.coverage.htmlunit.disable=true \
-Dtest.dev.selenium.disable=true \
-Dtest.draft.htmlunit.disable=true \
-Dtest.draft.selenium.disable=true \
-Dtest.emma.htmlunit.disable=true \
-Dtest.emma.selenium.disable=true \
-Dtest.nometa.htmlunit.disable=true \
-Dtest.nometa.selenium.disable=true \
-Dtest.web.selenium.disable=true
Note: that we have to set all disable variables but test.nongwt.disable
Run certain Jre tests in the user module.
$ ( cd user && ant test.nongwt -Dgwt.nongwt.testcase.includes="**/I18NJreSuite.class" )
Run all GWT tests in user using htmlunit in dev mode.
$ ( cd user && ant test.dev.htmlunit )
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