Pulled the latest version from github and able to build/run from command line. Loaded project into Apache Netbeans 12.1 with JDK 14.02 as based JDK
Netbeans code editor is trying to help highlight problems and based on imported gradle settings it thinks the source is 1.8 so get "var" warning messages and other new language features.
I searched on gradle settings to try and find the property that needs to be set. Could be a netbeans bug or I am missing something. I have minimal experience with tweaking gradle.
Clicking on Project Properites Nebeans shows "Source/Binary Format:" as 1.8.
The code compiles and able to run but would like to suppress the warnings.
Also not sure if we had a different problem using JDK 15 that it was throwing lots of error/warning messages.