Hibernate Dialect for Oracle 19
There isn't a newer dialect than 12c, and it would be fine to use it with 19c, but there was a bug in hibernate-orm that prevents the auto detection to work, see:
https://hibernate.atlassian.net/browse/HHH-13184
https://hibernate.atlassian.net/browse/HHH-13609
It is already solved in the newer 5.4 releases, and I opened a PR for the 5.3 branch.
A workaround for now is to manually set the dialect property hibernate.dialect to org.hibernate.dialect.Oracle12cDialect.