For Fuse on Springboot2,
combination of RHEL 7 + Oracle12cRAC + driver ojdbc8 12.0.0.1 does not work,
driver version need to be updated to e.g. 19.10.0.0.
Thi happens for javas jdk1.8, jdk11, ojdk1.8, ojdk11

It is identified with this error:

10:41:47 org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLRecoverableException: IO Error: Connection reset by peer, Authentication lapse 98926 ms.