The server where the SAP HR driver is installed must have the SAP Java Connector (JCo) client installed to provide the driver with conectivity to the SAP system. The SAP HR driver supports JCo versions 1.1.x, 2.x, and 3.x.
The JCo client is available to SAP customers and developer parnters through SAP, and is provided for most of the popular server operating systems. You can download JCo from the SAP Connector Web site.