With NetBeans 8.2 and before NetBeans wopuld automatically ask to download and install the FindBugs integration plugin when selecting Source->Inspect and selecting the FindBugs Configuration.
In NetBeans 11.1 it will ask to download and install this plugin, but it cannot find it and fails. -- In the mountains of truth, you never climb in vain - Nietzsche #------------------------------------------------------------- \_O ,__/> <" '
