https://bbs.youkuaiyun.com/topics/390721236?page=1
SQL Developer第一次启动后没问题,但是第二次启动后就报错,根据如下步骤可以解决:
1. Go to C:\Users\%USERNAME%\AppData\Roaming and rename "SQL Developer" folder to something like "SQL Developer-backup" to make sure you won't loose history etc.
2. Start SQL Developer and it will recreate the folder from the scratch. You can later copy the history from the backup folder.