SQL*Plus Location

Use this dialog box (displayed if you click Tools and then SQL*Plus and no SQL*Plus executable location is currently defined in your SQL Developer Preferences for Database Connections) to specify the location of the SQL*Plus executable on the system on which you are running SQL Developer. The SQL*Plus executable is under the Oracle Home directory or folder, and its specific location and file name depend on your operating system and Oracle Database installation.

If there is no SQL*Plus executable on the system on which you are running SQL Developer, you cannot invoke SQL*Plus from SQL Developer.