Run Java applets without installing Java

Latest Version

Version
2024.11
Update
December 1, 2024
Size
120MiB
Developer
cheerpj.com
Category
Users
100,000+
Rating
4.5303 ★
Manifest Version
3
Web Store Status
Languages Support
English
See more
Permissions
Scripting
ActiveTab
Storage
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CheerpJ Applet Runner Extension

CheerpJ Applet Runner - Run Java applets without installing Java

With the CheerpJ Applet Runner extension, you can run legacy Java Applets on modern browsers without a Java plugin or a Java installation.

Using the CheerpJ Applet Runner is simple. Just install and pin the extension. Next, visit your Applet-based website, click the extension icon in the upper-right corner of your browser, and then press the 'Enable' button in the popup. Once enabled, the extension is activated for the current domain, and Applets will start automatically if they are present.

This extension works by 'converting' the Java Applet to WebAssembly and JavaScript on the fly. It is private and secure, runs fully client-side (i.e. it does not contact any server), and does not collect any data or analytics at all. All your data, as well as your application are kept within the boundaries of your browser.

This extension, developed by Leaning Technologies, is based on CheerpJ, a JVM/JRE replacement for modern browsers. More information on CheerpJ are available at https://www.cheerpj.com.

This software is free to use for non-business purposes on public-network Applets. For any other use, such as internal network applets, or if you are a company or public-sector organisation and would like to license CheerpJ, please get in touch with [email protected].
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "CheerpJ Applet Runner", "description": "Run Java applets without installing Java", "version": "2024.11", "icons": { "128":"cheerpjAR_128x128.png", "32":"cheerpjAR_32x32.png" }, "action" : { "default_icon": "cheerpjAR_128x128_gray.png", "default_popup": "popup.html", "default_title": "CheerpJ Applet Runner Disabled" }, "background": { "service_worker": "bg.js" }, "permissions": [ "scripting", "activeTab", "storage" ], "optional_host_permissions": [ "http://*/", "https://*/" ], "content_security_policy": { "extension_pages": "script-src 'self'; object-src 'self'" }, "web_accessible_resources": [ { "resources": [ "cheerpj/*", "init_applet.js" ], "matches": [ "" ] } ], "storage": { "managed_schema": "storage_schema.json" }}
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User reviews

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JD Saidi (ID: 0000008ab672457c) Voted 1 ★ - Updated 06/14/2024 Doesnt work, the page doesnt load the applet

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NewZo (ID: 0000003b6ab46b69) Voted 5 ★ - Updated 04/23/2024 I use this Plugin to program our HPE Switches and some other Network devices and it is working great!

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Ayoub Freag (ID: 000000aede94c8e8) Voted 5 ★ - Updated 02/29/2024 Some Java Applet works and others don't. I send report to verify how to resolve the problem. Thanks

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Gianluca Bonetti (ID: 00000076b246ba7d) Voted 5 ★ - Updated 02/04/2024 Simply amazing semplicity and effectiveness. Very useful with old switches that only have a Java Applet interface and other similar appliances. Great job!

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Alex Prangpratanporn (ID: 00000071f3bbe884) Voted 5 ★ - Updated 01/04/2024 Super