A Browser-Based Solution To All Your Java Needs
CheerpJ can convert any Java client application into standard HTML5 / WebAssembly / JavaScript saving your business time, money and resources.
CheerpJ 2.3 is now available. Check it out! Release notes here.
What is CheerpJ?
An Enterprise-grade solution to modernise and preserve access to mission-critical Java Applications and Applets by removing the requirement for Java on the client.
CheerpJ converts Java bytecode into WebAssembly and JavaScript, so that it can run natively on modern browsers.
Why CheerpJ?
CheerpJ allows organisations to extend the life of their Java applications by making them usable on modern browsers, with no change to their source code.
It supports 100% of the Java language and runtime, read-write access to the file system, networking, printing, and many other system features.
CheerpJ does not require any server-side support, as all application components (converted application and runtime) are static. Applications converted with CheerpJ can run on any modern browser, on any operating system.
CheerpJ was developed with three main use-case scenarios in mind:
Legacy Applications
The conversion of legacy Java applications to HTML5 with minimal or no effort, making them accessible from modern browsers, without a local Java installation;
Java Applets
Accessing Java Applets on Chrome, Edge, Firefox, Safari, or any other modern browser, including for mobile. You can continue using your internal or third-party Java Applet interfaces on modern IT architectures;
Java Client Migration
The migration of an existing Java client to a browser-based web application, usually by converting the business logic from Java to WebAssembly/JavaScript with CheerpJ, and rewriting the UI in native HTML;
Customer Stories
Programming learning platform Hebbian leverages CheerpJ for Java courses
Hebbian is a platform that modernises how Computer Science is taught by allowing students to learn and practice programming directly in the browser. Co-founders Cameron Weibel and Herman Galioulline created the platform while studying at the International School in Zurich,…
CheerpJ Enables Cloud Video Platform To Run As A Browser-based HTML5 Application
Blackbird is the world’s fastest, most powerful professional cloud video editing and publishing platform. Their fully-featured, high-performance editor is accessed through any browser as an HTML5 web application, is easy to learn and needs only 2 Mb/s of bandwidth to use.…
CheerpJ brings PhET’s free education Java simulations to the web
PhET Interactive Simulations at the University of Colorado Boulder (https://phet.colorado.edu) provides over 150 interactive, research-based simulations for teaching science and mathematics. The simulations are used in primary, secondary, and university education, translated into over 80 languages and provided as open…
How CheerpJ Works
Ahead-of-Time
compilation
The CheerpJ compiler processes your Java bytecode ahead of time, generating optimised JavaScript that can run on any browser.
CheerpJ Runtime
In parallel to your converted application, deploy a higly-optimised runtime in WebAssembly and JavaScript, keeping 100% of the execution client-side. Based on a full unmodified build of OpenJDK .
On-line
CheerpJ Java compiler
Whenever new classes are generated (e.g. through proxy classes), CheerpJ will convert them on the fly for you.
Thanks to these three components, CheerpJ provides a seamless experience of executing a converted Java application on any browser, fully client-side. No plugins and no installation are required from the user.
Leaning Technologies coupled their clear ability to extend their toolset to support the ultimate software challenge with an unwavering determination to achieve the level of perfection required. After an intense but relatively short period, Blackbird was able to ship our [HTML] product to clients globally.
Stephen Streater
R&D Director, Blackbird PLC
