Recently I had to connect a Java application to SAP HANA and I made some notes along the way:
The first step is to get the SAP HANA JDBC driver, a file called ngdbc.jar. The quickest way is to download the SAP Hana Cloud Platform SDK from here: https://tools.hana.ondemand.com/#cloud
Choose the latest “Java Web Tomcat 8” from the download section (a package starting with neo-).
Unzip the archive to any location in your machine.
Extract the JDBC driver (ngdbc.jar) from the archive. You will find the driver in the archive inside a hidden folder under: repository/.archive/lib/ngdbc.jar)
Use the driver with the connection string
jdbc:sap://<server>:<port>
Where the port is
3<instance_number>15
So if your instance number is 10, the port would be 31015.
The custom driver class name is
com.sap.db.jdbc.Driver