I just downloaded a version from the Internet, unzip it first
as shown in the picture
Select jdk path
The version I downloaded is higher than 1.8, so I report an error. If I change to a 1.7 version jdk, it will succeed, and then connect to the database.
查instance_name（select instance_name from v$instance）
Destination sqlplus /nolog
conn username/password as sysdba
show user
select instance_name from v$instance；
This is a username password error
Just reconnect after modification
