FAT JAR for the apfloat CalculatorGUI.java #66

axkr · 2025-07-04T14:51:06Z

axkr
Jul 4, 2025

Can you provide a FAT JAR for your CalculatorGUI app?

https://github.com/mtommila/apfloat/blob/main/apfloat-calc/src/main/java/org/apfloat/calc/CalculatorGUI.java

I'm currently testing the CheerpJ tool to run some Java apps in the browser:

https://cheerpj.com/docs/getting-started/Java-app

My app is working very unstable at the moment,

https://github.com/axkr/SymjaCheerpJ

and I would like to know if the apfloat calculator is working in this environment.

mtommila · 2025-08-04T14:59:49Z

mtommila
Aug 4, 2025
Maintainer

Hello,

A "fat" jar i.e. a jar containing all the dependencies for the calculator app can be found at (it's also signed with a dummy certificate): https://www.apfloat.org/apfloat_java/lib/signedapplet.jar

As of right now, the calculator app seems to be working with the CheerpJ applet runner browser plugin, at: https://www.apfloat.org/apfloat_java/applet/calculator.html

As CheerpJ 3.0 was released, sometime at the beginning it was working. Then for a long time it was not working (with no changes to the calculator applet itself). But right now it seems to be again working. I'm guessing the version is newer and has been updated, latest CheerpJ seems to be 4.1 currently.

0 replies

axkr · 2025-08-04T16:17:20Z

axkr
Aug 4, 2025
Author

In my npx variant it doesn't seem to work?

I used a configuration which is similar to this getting started page:

https://cheerpj.com/docs/getting-started/Java-app

0 replies

mtommila · 2025-08-04T19:23:56Z

mtommila
Aug 4, 2025
Maintainer

I can get the calculator applet to work like that as well

With

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Apfloat calculator CheerpJ test</title>
    <script src="https://cjrtnc.leaningtech.com/4.2/loader.js"></script>
  </head>
  <body>
    <script>
      (async function () {
        await cheerpjInit();
        cheerpjCreateDisplay(800, 600);
        await cheerpjRunMain("org.apfloat.calc.CalculatorGUI", "/app/apfloat_java/lib/signedapplet.jar");
      })();
    </script>
  </body>
</html>

Note that the main class in the apfloat signedapplet.jar manifest is the pi computing applet, not the calculator applet, therefore I specify the class that has a static main() method to run the AWT calculator (it's not even the calculator applet class), with cheerpjRunMain instead of cheerpjRunJar.

The pi calculator doesn't seem to actually work with CheerpJ (it starts but does apparently nothing if you try to calculate pi).

Also note the somewhat strange "virtual file system" of CheerpJ where you have to specify the path to the jar file starting with /app because /app actually maps to the root of the web server. After "/app" put the actual path to the jar, relative from the root. (https://cheerpj.com/docs/guides/filesystem.html#cheerpjs-virtual-filesystem-mounting-points-explained)

1 reply

axkr Aug 4, 2025
Author

Ok that's working

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