Hi, Installing macOS Big Sur for the first time somehow lost the “which jdk to use” setting that was I think set at installation time.
This was fixed by editing: /Applications/NetBeans/Apache NetBeans 12.1.app/Contents/Resources/NetBeans/netbeans/etc/netbeans.conf and setting: netbeans_jdkhome="/Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home" Hope this helps as we all move to Big Sur ! Regards David