You want to register the MaxDB JDBC driver in the JDBC driver manager.
Load the class com.sap.dbtech.jdbc.DriverSapDB.
Class.forName ("com.sap.dbtech.jdbc.DriverSapDB");
If an exception of the class java.lang.ClassNotFoundException is raised, this indicates that the JDBC driver has not been installed correctly.
Install the driver again and proceed as described under Installing the JDBC Driver.