Hi @zellwd,
You can’t do it that way on client-side js. The libraries are for java not for Javascript which processingJS is build for.
Further, ProcessingJS is outdated, therefore you should use p5js.
You should adapt the java code to Javascript code. Not all thing from java are possible in js but most.
If you provide the java code, resp. processing java sketch you want to convert to js, we could try to help you …
Cheers
— mnse