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leaningtech / cheerpj-meta

Run Java 8 applications, libraries, applets, Java Web Start, and Oracle Forms on the web without legacy plugins.
https://labs.leaningtech.com/cheerpj
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Converted Java applet crashes on Firefox but works fine on other browsers: Unhandled exception N4java4lang20NullPointerException #150

Closed kacskrz closed 2 years ago

kacskrz commented 2 years ago

Link: https://vonthorn.sarmacja.org/galeria/archive/sarmacja.org/archiwum.sarmacja.org/starwars/ Crash log: unreachable code after return statement [loader.js:4:183] unreachable code after return statement [loader.js:4:741] unreachable code after return statement [loader.js:4:526] java.lang.NoClassDefFoundError:Reporting error: Unhandled exception N4java4lang20NullPointerException /_c4pbQxrZtgmxb$c9O2ZZcX0lcHfrunpqrniq8c0JYeChangedE4,_c4pbMpGfc4QaQkqZbRv0bpNc0qSu3pGi9amjCyefi7vr0m5vRd,ec4pbMpGfc4QaQkqZbRv0bsNc0qS0hr1u6amqe5zJd,em4VanJm3cGKuPdabzjaMczqrpiS3o,_c4pbMpGfc4QaQkqZbRv0bmNc0qSChr14zxd,_n4FZThread3runE22 [loader.js:3207:10] Unhandled exception N4java4lang20NullPointerException /_c4pbQxrZtgmxb$c9O2ZZcX0lcHfrunpqrniq8c0JYeChangedE4,_c4pbMpGfc4QaQkqZbRv0bpNc0qSu3pGi9amjCyefi7vr0m5vRd,ec4pbMpGfc4QaQkqZbRv0bsNc0qS0hr1u6amqe5zJd,em4VanJm3cGKuPdabzjaMczqrpiS3o,_c4pbMpGfc4QaQkqZbRv0bmNc0qSChr14zxd,_n4FZThread3runE22

The applet works fine on Opera GX, Chrome and Microsoft Edge; for some reason it refuses to run on Firefox. I can provide JAR file if needed.

marsicplusplus commented 2 years ago

Hi @kacskrz. I'm unable to make the application start both on Firefox and on Chrome, might be because of Cloudflare caching some older version?

From the error it seems like the outputted js from the compilation has been manually altered. Have you done this on purpose? If so, we can't guarantee that the application will always work. If that's not the case you should also try to disable CloudFlare Javascript optimizations, as it might be CF itself tampering our compiled code.

Best, Lorenzo

kacskrz commented 2 years ago

No, I haven't made any changes in JS, only on the HTML file (adjusting the parameters to CheerpJ syntax, adding loader.js and so on). I have just checked it in Chrome, works fine for me (and worked fine for other people I've asked about it).

marsicplusplus commented 2 years ago

As I said, could you please check for CloudFlare js optimizations?

kacskrz commented 2 years ago

Unless there's an option to do it without access to Cloudflare panel, I can't (as I don't have access to the panel).

alexp-sssup commented 2 years ago

Please understand that, since we observe unsupported post-processing of jar.js files, we are currently unable to help you. Can you reproduce the problem from a local (or otherwise directly accessible without CDN) HTTP setup?

If you can please provide a link to a directly accessible server or a self-contained archive.

kacskrz commented 2 years ago

No, I am not able to reproduce it on my XAMPP. It works fine on Firefox. I've also checked another server without cloudflare - it works fine. I will ask the server administrator about that. Thanks for your help!