Unable to invoke a method on an instance of a class

package com.si.dao;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
 
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
 
public class DbConn {
 
          /** Uses JNDI and Datasource (preferred style).   */
          static Connection getJNDIConnection(){
            String DATASOURCE_CONTEXT = "java:comp/env/jdbc/t002";
            
            Connection result = null;
            try {
              Context initialContext = new InitialContext();
              if ( initialContext == null){
                log("JNDI problem. Cannot get InitialContext.");
              }
              DataSource datasource = (DataSource)initialContext.lookup(DATASOURCE_CONTEXT);
              if (datasource != null) {
                result = datasource.getConnection();
              }
              else {
                log("Failed to lookup datasource.");
              }
            }
            catch ( NamingException ex ) {
              log("Cannot get connection: " + ex);
            }
            catch(SQLException ex){
              log("Cannot get connection: " + ex);
            }
            return result;
          }
 
          /** Uses DriverManager.  */
          static Connection getSimpleConnection() {
            //See your driver documentation for the proper format of this string :
            String DB_CONN_STRING = "jdbc:oracle:thin:@mtp98.hppwd.xyz.com:1522:t002";
            //Provided by your driver documentation. In this case, a MySql driver is used : 
            String DRIVER_CLASS_NAME = "oracle.jdbc.driver.OracleDriver";
            String USER_NAME = "user1";
            String PASSWORD = "pass1";
            
            Connection result = null;
            try {
               Class.forName(DRIVER_CLASS_NAME).newInstance();
            }
            catch (Exception ex){
               log("Check classpath. Cannot load db driver: " + DRIVER_CLASS_NAME);
            }
 
            try {
              result = DriverManager.getConnection(DB_CONN_STRING, USER_NAME, PASSWORD);
            }
            catch (SQLException e){
               log( "Driver loaded, but cannot connect to db: " + DB_CONN_STRING);
            }
            return result;
          }
 
          private static void log(Object aObject){
            System.out.println(aObject);
          }
        }

                                  

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70: