The CheerpJ JNLP Runner browser extension is the only solution that can run JNLP files in the browser, without a Java Desktop installation. No downloads or plugins required.
A modern, secure solution to run JNLP files
You can find the Documentation for the CheerpJ JNLP Runner here.
The CheerpJ JNLP Runner can be used to run any Java Web Start application provided in a JNLP file. It is based on the CheerpJ technology, which means that it has extensive support for Java 6, 7 and 8, and can run virtually any application that you could run with a Java Desktop installation.
The CheerpJ JNLP Runner is compatible with Chrome and Edge, as well as any other Chromium-based browser.
Yes. CheerpJ is used by many organizations worldwide to run Oracle Java-based products, such as Oracle Forms and Oracle EBS, on modern browsers. This includes several Fortune 500 companies as well as local and federal government agencies.
CheerpJ allows you to keep running any legacy Java Web Start application that is either impossible or impractical to replace or upgrade, extending the life of your application with minimal investment.
The CheerpJ JNLP Runner extension drastically improves the security profile of your application, by removing the need for a local Java Desktop installation, and by running your JWS application sandboxed within the browser.
No. The CheerpJ JNLP Runner does not have any requirement on the Desktop (and does not need Java to be installed) or on the Server.
Your application can remain unchanged, and you will not need any server side integration.
Yes. You can deploy the CheerpJ JNLP Runner to your organisations’ machines by using Group Policies (GPOs). You can do this on either Chrome or Edge. Further instructions on how to setup your GPOs for CheerpJ are available on the technical documentation.
Yes, we can assist you in self-hosting the CheerpJ JNLP Runner so that your organisation doesn’t need to access the Chrome Web Store or the Edge Add-Ons store.
We can provide a self-hostable version of the CheerpJ JNLP Runner to any organisation that requires it. Please get in touch with Enterprise Sales if you are interested in this.
A superb extension with great customer support! We have an large, extensive applet that displays automated weather reports from commercial aircraft that is used by weather services world-wide. Thanks to CheerpJ we can now run it again in a browser (chrome). The CheerpJ version is FAST, able to display 800,000+ wind barbs in just a couple of seconds. We’re very happy indeed.
Fantastic job. My large JAVA applet for a visual interactive discovery of derivatives and integrals of vector fields had been used all around the world for almost 20 years — then the browsers effectively killed it by withdrawing support for JAVA. I had not been able to rewrite it as a freestanding JAVA main program. So happy when I discovered CheerpJ in the spring. So many happy students, instructors, and folks from everywhere who just to play and discover!
Matthias Kawski
This is great! I had a set of online “animated diagrams” as Java applets since about 1999. Over the years, support for Java in browsers has disappeared due to security concerns. Now I can see my old applets again.
Craig Reynolds
Simply amazing simplicity and effectiveness. Very useful with old switches that only have a Java Applet interface and other similar appliances. Great job!
Gianluca Bonetti
The Java Applet I am using looks and behaves very similarly under CheerpJ on a modern computer, vs an ancient computer with an old browser that actually runs Java applets. Performance is good, too. Five stars!
Leaning Technologies coupled their clear ability to extend their toolset to support the ultimate software challenge with an unwavering determination to achieve the level of perfection required. After an intense but relatively short period, Blackbird was able to ship our [HTML] product to clients globally.
Stephen Streater
R&D Director, Blackbird PLC
Discover how to modernize and improve access to your legacy Java applications with CheerpJ.
Schedule a free demo with our team to learn how CheerpJ can help address your Java requirements.
Fill in the form or book a demo directly here
English (UK) 
日本語