Same issue here. After upgraded the system to Big Sur, my Netbeans cannot access to any file or folder. Should this be solved by Apple or Netbeans? How to give full access to Netbeans again? Below recommendations dıd not work Thanks in advance for your help.

Dear bparis, Thank you very much. But when we run Netbeans from terminal, we cannot open the old projects. It starts to open, but stops on 10% opening progress.