Ok, I using getString but also it dosent work, it gives the same error

try{
        Class.forName ("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger");
//                DriverManager.getConnection("jdbc:oracle:oci8:@127.0.0.1:1521:ORCL", "scott", "tiger");    
Statement stmt = conn.createStatement();
       
ResultSet rset = stmt.executeQuery("select SUPPLIER_NAME from suppliers");
       
        int i = 0;
        //Vector rows = new Vector();
        while (rset.next()){
           
            String s1=null,s;
            //Vector<Object> newRow = new Vector<Object>();
            //String s = null;
           
            s = s1.valueOf(rset.getString(1));
            //newRow.addElement(rset.getString(1));
                         System.out.println (s);
                         
                         jTable1.setValueAt(s, i, 0);
                         //jTable1.setValueAt(newRow.elementAt(0), i, 0);
                         i++;
                   //rows.addElement(newRow);
       }
       
        rset.close();
        stmt.close();
} catch (Exception e) {
              e.printStackTrace();
        }

the problem is
at Suppliers.jButton3ActionPerformed(Suppliers.java:312)

that means in executeQuery
ResultSet rset = stmt.executeQuery("select SUPPLIER_NAME from suppliers");

my JDBC driver version is 8.1.6.0.0
if i need to download the latest version oracle jdbc driver, please give me the latest version or give me a link to download it.