Graphics output distorted, rainbow noise


I’m running a simple program that should create a new sketch and draw it on the screen, but the output is this interesting rainbow noise:

I’m compiling manually with Java using Processing 3.5.4.
Let me know if any of you have seen this before!

I’m running this on Alpine Linux, using Xvfb as display.
I see the same problem for all versions of Processing.

I can display to the screen using other processes (like imagemagick), so the issue is isolated to Processing

What is the code content of the sketch that you are compiling? What is the expected output – a black screen?

It was a grey background
I figured out the issue here was compiling without a few of the .jar files.
It might be helpful to have some documentation on which .jars are needed when compiling Java manually, but otherwise this is resolved! Thanks