12.1.1 Automatic loading of java.sql.Driver
In JDBC 4.0 API, there is no need to register the Driver class. However, processing that explicitly registers the Driver class causes no problem.
Hitachi Advanced Database Application Development Guide
12.1 HADB's scope of support for the functions added in the JDBC 4.0 API
12.1.1 Automatic loading of java.sql.Driver