Run Java Web Start Applications without Java

Latest Version

Version
1.4
Update
July 31, 2024
Size
119MiB
Developer
Category
Users
1,000+
Rating
3 ★
Manifest Version
3
Web Store Status
Languages Support
English
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Permissions
Downloads
Storage
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CheerpJ JNLP Runner Extension

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 the JNLP Runner extension will automatically activate. A new Chrome tab will open, and after agreeing to the license, you'll see the options 'Start Application' and 'Download'. Simply click on 'Start Application', and the Java application will be executed within the browser.

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
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "CheerpJ JNLP Runner", "description": "Run Java Web Start Applications without Java", "version": "1.4", "icons": { "128":"jnlp128x128.png", "32":"jnlp32x32.png" }, "action" : { "default_icon": "jnlp32x32.png", "default_title": "JNLPs will start automatically when downloaded" }, "background": { "service_worker": "bg.js" }, "permissions": [ "downloads", "storage" ], "web_accessible_resources": [ { "resources": [ "cheerpj/*" ], "matches": [ "" ] } ], "sandbox": { "pages": ["sb.html"] }, "optional_host_permissions": [ "http://*/*", "https://*/*" ], "storage": { "managed_schema": "storage_schema.json" }}
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How to download and manually install CheerpJ JNLP Runner extension for Chrome

Looking for a way to install CheerpJ JNLP Runner extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install CheerpJ JNLP Runner extensions manually, this article outlines two simple methods to effortlessly install CheerpJ JNLP Runner extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download CheerpJ JNLP Runner extension and manually install through Drag &Drop

If you ever need to manually install a CheerpJ JNLP Runner extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the CheerpJ JNLP Runner Extension by clicking the "Download CRX" button on the website.

Look for the CheerpJ JNLP Runner extension you wish to install. Go to the website and download the CheerpJ JNLP Runner extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for CheerpJ JNLP Runner extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the CheerpJ JNLP Runner extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download CheerpJ JNLP Runner extension for Chrome and install in Developer Mode

This is another method to install CheerpJ JNLP Runner extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the CheerpJ JNLP Runner extension file

Select and download the CheerpJ JNLP Runner extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the CheerpJ JNLP Runner extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your CheerpJ JNLP Runner extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the CheerpJ JNLP Runner extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install CheerpJ JNLP Runner extension in 2 ways. We hope this guide proves helpful.

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