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Show HN: CheerpJ JavaFiddle – Run Java in the browser (leaningtech.com)
65 points by apignotti 7 months ago | hide | past | web | favorite | 18 comments

Now you can just shove this in electron and have java apps everywhere again!

Then run the Electron application in the browser with Emscripten

Awesome! I'm very excited about this...

As the primary developer of a large sophisticated Javascript app (https://shaxpir.com), working with Javascript is an ongoing nuisance, and I'd love to switch the majority of my development to a type-safe language.

I've been considering a switch to TypeScript, but with 17 years of experience as a back-end Java developer, my natural first-choice of language is Java.

But this is a modern webapp, so I'm not really interested in seeing Console/Swing/AWT demos. I'm much more interested in seeing demos that integrate Java code with native Javascript dependencies, especially around DOM manipulation and browser event handling.

I want to rewrite all my own business logic in Java, while continuing to integrate with my existing dependencies in the browser (JQuery, Bootstrap, Quill, etc).

A demo like that would be very compelling to me!

Hello Benji!

Please get in touch with us, your project is very exciting and would be a great use case for CheerpJ. Just drop us a line at http://leaningtech.com/cheerpj/#early.

CheerpJ has full DOM access and interoperability with JavaScript. Demos of these case study will be coming soon.

Cheers - LT

Seems to work pretty well. I like this approach over things like GWT. Though creating a syntax error caused a bad exception:

  public class JavaFiddle
      public static void main(String[] args)
          x = 0;
Results in

  An exception has occurred in the compiler (1.8.0_131). 
  Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.

Wow, good job! The CheerpJ Chrome Extension to run old Java Applets actually works, eg http://dogfeathers.com/java/octicos.html

If you don't see any "compile and run" button or the text console, you may need to zoom out or go fullscreen. That was my case on Firefox 54 with a 1366x768 screen.

I don't anticipate ever using AWT or Swing again. JavaFX would get me interested but I don't see it mentioned. How feasible would that be?

The boilerplate HelloWorld code hangs on `compiling...` for me. Not sure if it's my network ad-blocker or something else though.

Hello there. Can you share your browser and OS? We can't replicate this here. - LT

Same here. Worked after I deactivated my addblocker (uBlock Origin)

same here using privoxy

Besides the Swing/AWT support which isn't very interesting to me how do you compare to teavm?

We currently use TeaVM and it's pretty performant/small.

Obviously not a problem with the platform, but your example Java code doesn't really use standard Java conventions. A bit odd for samples usually.

Horizontal non-resizability of the editor is a bit of an issue (Chrome / Win7).

You are right of course. This will keep improving over time, especially on the HTML side of things. We'll keep your comment in mind. Cheers - LT

This is seriously cool. Who needs a REPL when you can just use this.

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