CheerpJ for the public sector

CheerpJ runs government Java applications in Chrome, Edge, Firefox and Safari, from tax and customs systems to case management and citizen services. The applications stay as they are, served from servers you control, and Java comes off staff computers.

Get started

Public sector organisations we work with

The Java applications CheerpJ runs in the public sector

CheerpJ is a complete Java runtime, built from OpenJDK and compiled to WebAssembly. It runs your compiled applications as they are, including third-party and obfuscated code, on Java 8, 11, 17 and 21, with Java 25 in preview.

That includes Oracle applications with Java clients, such as Oracle Forms, Oracle E-Business Suite and Oracle Discoverer, as well as other vendors’ applications and the ones your own developers built.

Applets

Citizen services and signing tools built as applets run in modern browsers again.

Java Web Start applications

Case-management and back-office clients launched through Java Web Start open from a browser tab.

Desktop applications

Swing and AWT applications used by caseworkers and officers run in the browser as they are.

Java libraries

Calculation and eligibility rules written in Java can be called from JavaScript in new digital services.

What works in the browser

Files

01

Users upload files to the application, and files it saves arrive as browser downloads.

Printing

02

The application prints through the browser.

Copy and paste

03

Copy and paste work inside the application, and with other applications when you turn it on.

Networking

04

HTTP requests go through the browser. TCP and UDP connections go through Tailscale, with the control server on your own network.

Windows and keyboard

05

Applications keep their multiple windows, and their keyboard shortcuts pass through the browser.

Audio

06

Applications play sound through the browser.

For your security review

The browser sandbox

The application runs inside the browser’s sandbox, under the same security model as your other web applications, and reaches files and the network only through browser APIs and their permissions.

Hosted on your own servers

CheerpJ is a set of static files you host on your own web servers, including on segregated and air-gapped networks.

Updates from one place

You update CheerpJ and the application on your servers, and staff get the new version the next time they open it.

Licences activated offline

The browser extensions take a licence token that activates offline, so a deployment can stay entirely inside your network.

Get started

Talk to us

Tell us about the service, the Java application behind it and how staff launch it, and we’ll help you plan an evaluation.

Talk to us

Build with Java for the browser.

Start building Run your Java app Talk to us