You have installed the SAP MaxDB JDBC driver.
More information: Installing the SAP MaxDB JDBC Driver and Java Classes
Use the forName method of the Java platform's Class class.
Syntax
Class.forName ("com.sap.dbtech.jdbc.DriverSapDB");
When executing the Java application, the Java platform loads the SAP MaxDB JDBC driver and automatically registers it in the JDBC driver manager.
If an exception of the java.lang.ClassNotFoundException class is triggered, the Java platform could not find the SAP MaxDB JDBC driver.
Documentation for the Java platform at http://java.sun.com