Are you getting the following error when trying to export any result queries on Sqldeveloper ??
Fix : Open the SQL Developer installation folder, locate the sqldeveloper.conf file and finally add the below line before restarting the Sqldeveloper :
AddVMOption -Dide.user.dir=D:/SQLDeveloper/.sqldeveloper
Works fine now 🙂
N.B : Replace the above sqldeveloper path with your sql developer installation folder path