SQL exception:could not resolve service name

[Ajay Divakaran]

I have Oracle9i installed.
When I run this program I get an sql exception on line 8 stating that "could not resolve service name"

import java.sql.*;
public class TestOCIApp
{
  public static void main(String args[])
  throws ClassNotFoundException,SQLException
  {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection conn = DriverManager.getConnection("jdbc:oracle:oci:@dssora01.dss","scott","tiger");
    Statement stmt = conn.createStatement();
    ResultSet rset = stmt.executeQuery(
     "select 'Hello OCI driver tester '||USER|| '!' result from dual");
    while(rset.next())
         System.out.println(rset.getString(1));
    rset.close();
    stmt.close();
    conn.close();
  }
}