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Run Java Web Start Applications without Java CheerpJ JNLP Runner - Run Java Web Start applications without installing Java With the CheerpJ JNLP Runner extension, you can run Java Web Start (JWS) applications on modern browsers without a local Java Desktop installation. JNLP files are XML files that are used to run legacy Java Applications over the network, using the Java Web Start launcher, which usually comes with some distributions of Java. This browser extension, based on the CheerpJ technology, is designed to replace the local Java Desktop installation, and run Java Web Start applications within the browser, without a Java installation. The extension is designed to be simple and easy to use. Once installed, navigate to the website hosting the JNLP file and click it to download as you normally would, the JNLPRunner extension will automatically detect and launch the Java application directly in the browser, no extra steps needed. A side panel will appear on the left side of the screen, giving you quick access to settings, file uploads, and license management. You can also upload or drop a local JNLP file into the extension popup to launch it directly, in case the extension fails to detect the download. The extension 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 is available at https://cheerpj.com
Jul 31, 2026
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