The Oracle JDBC drivers are now available in Maven Central. Here is the Link:
Oracle JDBC Drivers - Maven Central
Oracle developers article announcing the availability of the Oracle JDBC drivers in Maven Central:
Oracle announcing - Oracle JDBC drivers available in Maven Central
Example:
<!-- https://mvnrepository.com/artifact/com.oracle.jdbc/ojdbc10 -->
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc10</artifactId>
<version>19.3.0.0</version>
</dependency>