I cannot obtain the schema name when creating an Oracle relational database migration job.
The latest ORACLE_8 driver, which is not supported, may have been uploaded, for example, the Oracle Database 21c (21.3) driver.
You are advised to use the ojdbc8.jar driver in Oracle Database 12c. You can download the driver from https://www.oracle.com/database/technologies/jdbc-ucp-122-downloads.html.