mirror of
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77 lines
3.8 KiB
Markdown
77 lines
3.8 KiB
Markdown
<h1><img src="assets/logotype.svg" alt="CheerpJ" height="96"></h1>
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[](https://labs.leaningtech.com/cheerpj3)
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[](https://discord.leaningtech.com)
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[](https://github.com/leaningtech/cheerpj-meta/issues)
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CheerpJ is a WebAssembly-based **Java Virtual Machine for the browser**. It
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has extensive compatibility with Java 8 and provides a full runtime
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environment[^compat] for running Java applications, applets, libraries, and
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Java Web Start / JNLP applications in the browser without plugins.
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[Documentation](https://labs.leaningtech.com/cheerpj)
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[Examples](examples)
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[Issues](https://github.com/leaningtech/cheerpj-meta/issues)
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[Discord server](https://discord.leaningtech.com)
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```html
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<script src="https://cjrtnc.leaningtech.com/3.0/cj3loader.js"></script>
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```
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## Features
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With CheerpJ, you can:
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- Run existing **Java applications** in the browser with no changes
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- Include **Java applets** in webpages without legacy plugins
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- Migrate **Java Web Start / JNLP** applications to work on modern systems
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- Use **Java libraries** in JavaScript/TypeScript seamlessly
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- Interoperate between Java and JavaScript libraries
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CheerpJ is based on a full OpenJDK runtime environment. It supports reflection, custom classloaders, networking, file access, clipboard, audio, printing, Swing, and AWT.
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[Get started](https://labs.leaningtech.com/cheerpj3/getting-started)
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## How does CheerpJ work?
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CheerpJ is a combination of two components:
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1. An optimising Java-to-JavaScript JIT compiler.
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2. A full Java SE 8 runtime based on OpenJDK.
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Both are written in C++ and are compiled to WebAssembly & JavaScript using [Cheerp](https://labs.leaningtech.com/cheerp).
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[Learn more about CheerpJ's architecture](https://labs.leaningtech.com/cheerpj3/explanation/architecture)
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## What's unique about CheerpJ?
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1. Extensive support of Java 8, including Swing, reflection and dynamic class loading with no manual intervention on the code.
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2. CheerpJ works directly on Java bytecode, and does not require access to the Java source code.
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3. CheerpJ comes with a full Java SE runtime, inclusive of Swing/AWT. It supports audio, printing, and any other Java SE features. The runtime supports WebAssembly for optimal performance and size.
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4. The JavaScript code generated by the CheerpJ JIT is highly optimised and garbage-collectible.
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5. CheerpJ enables bidirectional Java-JavaScript interoperability. JavaScript libraries, as well as the DOM, can be called and manipulated from Java. Also, Java modules can be invoked from JavaScript.
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6. CheerpJ supports Java multi-threading. In addition, you can create concurrent applications by using Web Workers.
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## Licensing
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CheerpJ is free for personal use and technical evaluation. See [licensing](https://labs.leaningtech.com/cheerpj3/licensing) for details.
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## Demos
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Several demos of CheerpJ can be found [here](https://leaningtech.com/demo/).
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You can also see CheerpJ in action in [JavaFiddle](https://javafiddle.leaningtech.com/) and [Browsercraft](https://browsercraft.cheerpj.com/).
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## Community
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CheerpJ is used in production by teams at NASA, Siemens, UBS, and [many others](https://leaningtech.com/case-studies/).
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We have a vibrant Discord community where you can ask questions, share your projects, and get community support.
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[Join the Discord server](https://discord.leaningtech.com)
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[Follow us on Twitter](https://twitter.com/leaningtech)
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[^compat]: CheerpJ has been tested on Oracle Forms, EBS, Swing, AWT, and numerous frameworks and libraries. It should be able to run Java SE applications that you would otherwise need a Java Runtime Environment for.
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