Hello @paulstgeorge,
What version of Processing and OS are you using?
I use processing cli with Processing 4.4.10 and W10.
processing-java
is now replaced with
processing cli
See this reference for processing-java.exe :
https://github.com/processing/processing/wiki/Command-Line#adding-command-line-arguments
References:
Processing 4 processing-java binary? - #10 by stefterv
processing cli --help links to old repository · Issue #1366 · processing/processing4 · GitHub
:)