GWT Introduction for Eclipse Day
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GWT (Google Web Toolkit) allows developers to write client-side applications in Java and have their code compiled to optimized JavaScript. It provides a set of user interface components and handles cross-browser compatibility so developers do not need to be experts in JavaScript, HTML and CSS. GWT applications benefit from Java features like strong typing, code completion and refactoring while delivering the performance of native JavaScript. The GWT plugin for Eclipse provides tools that improve developer productivity when building GWT applications.
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GWT Introduction for Eclipse Day
- 1. DNG Consulting http://www.dng-consulting.com Google Web Toolkit Why this technology is cool ? v1.0
- 2. Speaker : Sami JABER – DNG Consulting DNG Consulting owner & Software Architect Author of "Programmation GWT 2" published with Eyrolles (next version expected in the coming weeks) DNG Consulting : IT Consulting & Training & Services company focused on JEE and .NET technologies Architecture, Google Web Toolkit experts Rich-Client applications (Java, .NET, …) We build software for our customers in an agile fashion with the best technologies 2
- 3. Project history Initially created by a small team at Google The beginning : Open Source in 2006 Large community Project hosted at : http://code.google.com/webtoolkit/ Active forums with lot of contributors (gwt-users & gwt-contribs) Several books in English and French, conferences, ... More and more applications are migrated in GWT (to convert existing Flash or Silverlight applications) Version 1.5 downloaded 800.000 times Version 2.0 shipped in 2010 Version 2.4 shipped in 2012 3
- 4. GWT philosophy For GWT, a Web Developer should not be a Javascript, HTML or CSS Guru GWT relies on a real component model similar to the way we build « Swing » applications GWT ensures transparently JS/HTML code generation from Java code GWT has been designed to be multi-browsers thanks to Deferred Binding technology JavaScript becomes a kind of Assembly language (it is optimized, obfuscated and compressed) 4
- 5. Coding in JavaScript is tricky Javascript is a script language poorly mastered by most developers (in the other hand, quite everybody know Java) There is more than hundred different frameworks, which one to use ? JQuery ? Prototype ? Closure ? ExtJS ? Maintainability of a big application containing tons of JS code can be a nightmare Technical skills required to master HTML 5 JavaScript, DX?HTML (3.2, 4, 5), CSS[1-3], DOM Level[0-3], SVG, Canvas… Debugging is tricky (specially if we want a real stack trace), complex variable watching not always possible JavaScript is not natively « Object Oriented » 5
- 6. Why GWT is cool ? Because Java is cool Strongly typed language, Compile Time checking, polymorphism, refactoring, « testability » Productivity Similar to a Swing, Rich-client development Code completion Performances Generated JavaScript is optimized, reduced The framework eliminates JS memory leak You pay only for what you use (more Java code you have, more the JavaScript will grow) with the help of the Compiler 6
- 7. Performances 7
- 8. One code generates multiple JS scripts One code used to generate multiple JS scripts called "permutations" One Java Code base Mycode.java Optimized JavaScript without if/else useragent 8
- 9. GWT Components Checkbox, list, textbox, labels, tree, datagrid, … Similar to what we can see with Swing, SWT 9
- 10. Eclipse tooling Google Plugin for Eclipse allows to easily create and deploy GWT applications New Web Application Wizard to create a App Engine application Cloud SQL tooling to use Cloud SQL as a database for your App Engine application, and JPA support for Cloud SQL Importing the latest Google APIs Using an App Engine connected Android project to use App Engine as a backend for your Android projects One-click deploy to App Engine GWT Designer Assists developers in creating a rich user experience via WYSIWYG 10
- 11. Démo 11
- 12. Features in the pipe … New feature (experimental in 2.5) : SuperDevMode Ability to debug directly the JS generated code JS Closure Compiler integration : The generated JavaScript is compiled with Closure (10% more code reduction) CodeSplitting2 : Code Fragmentation with optimized leftover fragments Big applications are better handled by GWT Bug fixing Map support in RequestFactory, Safe Styling, … 12
Editor's Notes
- Entreprise JavaBeans 3.0
- Entreprise JavaBeans 3.0
- Entreprise JavaBeans 3.0 GWT est une techologie catalysée par AJAX et qui part du principe qu’un développeur Web doit pouvoir concevoir une application AJAX sans être être un expert JavaScript
- Entreprise JavaBeans 3.0 Les défaut de JavaScript sont nombreux Maintenabilité difficile Langage dynamique mal maîtrisé par les développpeurs Compétences nécessaires demandées trop importantes pour le commun des mortels
- Entreprise JavaBeans 3.0 Entry-Point Classes A module entry-point is any class that is assignable to EntryPoint and that can be constructed without parameters. When a module is loaded, every entry point class is instantiated and its EntryPoint.onModuleLoad() method gets called. Source Path Modules can specify which subpackages contain translatable source, causing the named package and its subpackages to be added to the source path. Only files found on the source path are candidates to be translated into JavaScript, making it possible to mix client-side and server-side code together in the same classpath without conflict. When module inherit other modules, their source paths are combined so that each module will have access to the translatable source it requires. Public Path Modules can specify which subpackages are public, causing the named package and its subpackages to be added to the public path. When you compile your application into JavaScript, all the files that can be found on your public path are copied to the module's output directory. The net effect is that user-visible URLs need not include a full package name. When module inherit other modules, their public paths are combined so that each module will have access to the static resources it expects.
- Entreprise JavaBeans 3.0 Entry-Point Classes A module entry-point is any class that is assignable to EntryPoint and that can be constructed without parameters. When a module is loaded, every entry point class is instantiated and its EntryPoint.onModuleLoad() method gets called. Source Path Modules can specify which subpackages contain translatable source, causing the named package and its subpackages to be added to the source path. Only files found on the source path are candidates to be translated into JavaScript, making it possible to mix client-side and server-side code together in the same classpath without conflict. When module inherit other modules, their source paths are combined so that each module will have access to the translatable source it requires. Public Path Modules can specify which subpackages are public, causing the named package and its subpackages to be added to the public path. When you compile your application into JavaScript, all the files that can be found on your public path are copied to the module's output directory. The net effect is that user-visible URLs need not include a full package name. When module inherit other modules, their public paths are combined so that each module will have access to the static resources it expects.
- Entreprise JavaBeans 3.0