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You can mix handwritten JavaScript in your Java source code to interface with existing JavaScript APIs. Use other JavaScript libraries and native JavaScript code Want to reuse your Widget in another project? Simply package it up for others to use in a JAR file.

Reuse UI components across projectsĬreate reusable Widgets by compositing other Widgets, then easily lay them out automatically in Panels.

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This means that a Firefox browser displaying an application in French doesn’t need to download extra code for other browsers or languages. GWT creates a separate compiled version of your application that is optimized for a particular user’s environment. Optimize the JavaScript script downloads based on user profile

Because GWT works with many standard communication protocols, you can easily communicate back and forth. You don’t have to run Java on your server to use GWT to build your client. You don’t need to know the lower level details and frustrations of XHR calls. GWT can handle all of the client-server communications for you, whether you use JSON, XML, or GWT’s optimized Remote Procedure Call (RPC) system. Oh, and you can mix in and interoperate with JavaScript in your source code as well. All that runs in the end is plain ol’ JavaScript in the browser. You then compile that source code to JavaScript. The GWT SDK provides a core set of Java APIs and libraries that allow you to productively build user interfaces and logic for the browser client. Other interesting things In the end, it’s just JavaScript Another example: the GWT compiler selectively inlines methods, eliminating the performance overhead of method calls. For example, the GWT compiler safely eliminates dead code – aggressively pruning unused classes, methods, fields, and even method parameters – to ensure that your compiled script is the smallest it can possibly be. Unlike JavaScript minifiers that work only at a textual level, the GWT compiler performs comprehensive static analysis and optimizations across your entire GWT codebase, often producing JavaScript that loads and executes faster than equivalent handwritten JavaScript. Write AJAX apps in the Java language, then compile to optimized JavaScript When you’re ready to deploy, the GWT compiler compiles your Java source code into optimized, standalone JavaScript files. During development, you can iterate quickly in the same “edit - refresh - view” cycle you’re accustomed to with JavaScript, with the added benefit of being able to debug and step through your Java code line by line. With the GWT SDK, you write your AJAX front-end in the Java programming language which GWT then cross-compiles into optimized JavaScript that automatically works across all major browsers.

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