It seems that newer versions of Keycloak removed the Oracle driver for licensing issues. keycloak/keycloak#29491 The solution would be to externally install the driver (you could use initContainers, ...

at java.lang.Class.forName(Class.java:348) at org.apache.seatunnel.connectors.seatunnel.jdbc.internal.connection.SimpleJdbcConnectionProvider.loadDriver(SimpleJdbcConnectionProvider.java:80) at ...

Here we explain the difference between the four JDBC driver types, and how to choose the right JDBC driver for your database-driven Java apps.