Early JDBC driver load?

Hi

I'm using postgresql-8.3-604.jdbc3.jar driver

I have a very simple java program to inspect what drivers are initially
loaded:

import java.sql.DriverManager;

public class ListDrivers {

java.util.Enumeration myDrivers = DriverManager.getDrivers();
while (myDrivers.hasMoreElements()){
System.out.println(myDrivers.nextElement());
}
}
}

When I run it using:

java -cp .;postgresql-8.3-604.jdbc3.jar ListDrivers

It returns

sun(dot)jdbc(dot)odbc(dot)JdbcOdbcDriver(at)3cb89838
org(dot)postgresql(dot)Driver(at)b815859

Note that I have not loaded the driver using the typical classForName
neither the java -Djdbc option

Why postgres driver is loaded only by including the jar file in the
classpath?

Thanks

Jesus