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CheerpJ
Run Any Java Application in Modern Browsers

CheerpJ
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Home: https://cheerpj.com

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What is CheerpJ?

CheerpJ is a WebAssembly-based Java Virtual Machine and distribution of OpenJDK designed specifically for modern browsers. It provides robust support for Java 8, Java 11, and Java 17 (preview), facilitating the running of large-scale, unmodified Java applications, applets, and Java Web Start applications directly in browsers without the need for local Java installations or legacy plugins.

Offering rich UI support, CheerpJ ensures compatibility with frameworks such as Swing, AWT, and Oracle Forms, while maintaining strong security through browser sandbox isolation. The tool streamlines the modernization of legacy Java applications, enabling organizations to migrate to web standards without costly rewrites, and empowers developers to integrate Java components into client-side web applications with full system integration capabilities.

Features

  • WebAssembly JVM: Runs Java directly in modern browsers using WebAssembly technology.
  • Broad Java Compatibility: Supports Java 8, Java 11, and Java 17 (preview), with future Java 21+ support planned.
  • Rich UI Framework Support: Compatible with Swing, AWT, Oracle Forms, EBS, and various Java frameworks.
  • Security & Isolation: Operates within browser sandbox for enhanced security and system isolation.
  • Full System Integration: Supports clipboard, networking, file access, and custom native methods.
  • Legacy Application Modernization: Enables migration of legacy desktop and enterprise Java applications to the browser.
  • Seamless Applet and JNLP Runner: Runs Java applets and Web Start applications without legacy browser or plugins.
  • OpenJDK Compatibility: Ships a full OpenJDK environment for strong Java language compliance.

Use Cases

  • Modernizing legacy Java desktop applications for browser deployment.
  • Running enterprise Java Web Start applications (JNLP files) in Chrome or Edge without local Java installation.
  • Accessing and restoring Java applets on legacy websites.
  • Developing new web applications utilizing existing Java libraries and components.
  • Supporting migration of internal enterprise software to browser-based solutions.
  • Delivering scientific, technical, or educational tools reliant on Java in a browser environment.

FAQs

  • What versions of Java does CheerpJ support?
    CheerpJ currently supports Java 8, Java 11, and Java 17 (in preview), with support for Java 21+ planned for 2026.
  • Do I need to install any plugins to use CheerpJ?
    No, CheerpJ enables running Java applications and applets in the browser without the need for plugins or local installations.
  • Is CheerpJ compatible with Java applets and Java Web Start applications?
    Yes, CheerpJ allows you to run Java applets and Java Web Start (JNLP) applications directly in modern browsers like Chrome and Edge.
  • How does CheerpJ enhance security for running Java applications?
    CheerpJ operates entirely within the browser’s sandbox, providing isolation from the host system and improving security.
  • Can CheerpJ help migrate legacy enterprise Java software to the web?
    Yes, CheerpJ is designed to help organizations modernize and migrate legacy Java desktop and enterprise software into browser-based applications.

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