The NoSuchMethodError is usually caused by duplicate Java libraries. Your steps to delete the lang3 libraries from the /projectdir/userlib folder and download the CommunityCommons module again is the correct approach.
Be aware that not all ‘lang3’ libraries are named consistently: I searched my projects and I have one project with these files:
which could result in the error you described.
I experience the same error when executing the java action `random strong password’.
This did not happen before, but only after updating the community commons module, as far as i know. I already removed the (org.apache.)commons.lang3 jars, but this did not help
Downgrading to version 8.3.1. of Community Commons worked for me.