No output in java processing

Problem description

java Processing will not draw an output when in firewalledreplit mode.

Expected behavior

it should draw output

Actual behavior

it does not draw output

Steps to reproduce

try using java processing to draw output and you will see this occur.




windows 10

Device if mobile




I am a teacher and my pupils and I are experiencing the same problem, albeit when using python modules such as tkinter, pygame and turtle.

The same problem occurred last year and eventually it was resolved, however, it is back again!

I have tested it at school, home and on my phone via 4G and the same problem happens.

The link below should go to an example repl causing the problem:

I’ve also included a screenshot of the error

Any help would be greatly appreciated as this problem is causing real issues for my pupils working on projects.