PreparedStatement not updating Oracle database

Question

I have wriiten a PreparedStatement to insert rows into a table that I have previously created but insert doesn't seem to be working. The program isn't reporting any exceptions but when do a select * on the table, no new rows have been inserted. Here is my code...
import java.sql.*;
import java.io.*;
import java.util.*;
public class VideoStore {
     static Properties props;
     static Connection conn;
     static String driver, url, dbname, userName, password;
     // constructor
     VideoStore() {
          // load the database properties file
          try {
               props = new Properties();
               FileInputStream in = new FileInputStream("database1.properties");
               props.load(in);
               driver = props.getProperty("jdbc.driver");
               url = props.getProperty("jdbc.url");
               dbname = props.getProperty("jdbc.dbname");
               userName = props.getProperty("jdbc.username");
               password = props.getProperty("jdbc.password");
          } catch (FileNotFoundException e) {
               System.err.println("Caught FileNotFoundException: " + e.getMessage());
          } catch (IOException e) {
               System.err.println("Caught IOException: " + e.getMessage());
          // load the JDBC driver
          try {
               Class.forName(driver);
          } catch (ClassNotFoundException e) {
               System.err.println("Caught ClassNotFoundException: " + e.getMessage());
          // establish a connection to the database
          try {
               conn = DriverManager.getConnection(url + ":" + dbname,userName,password);
          } catch (SQLException e) {
               System.err.println("Caught SQLException: " + e.getMessage());
     } // end constructor
     // member function to signup a new member
     void addMember() {
          String last, first, address;
          PreparedStatement stmt = null;
          try {
               stmt = conn.prepareStatement("INSERT INTO members values (?, ?, ?, ?, ?)");
          } catch (SQLException e) {
               System.err.println("Caught SQLException: " + e.getMessage());
          last = readEntry("Enter last name: ");
          first = readEntry("Enter first name: ");
          address = readEntry("Enter address: ");
          try {
               stmt.setInt(1, 15);
               stmt.setString(2, last);
               stmt.setString(3, first);
               stmt.setString(4, address);
               stmt.setInt(5, 0);
          } catch (SQLException e) {
               System.err.println("Error adding member");
          try {
               stmt.close();
          } catch (SQLException e) {
               System.err.println("Caught SQLException: " + e.getMessage());
     } // end addMember()
     // function to read an input String. taken from page 217 of the text          
     static String readEntry(String prompt) {
          try {
               StringBuffer buffer = new StringBuffer();
               System.out.print(prompt);
               System.out.flush();
               int c = System.in.read();
               while(c != '\n' && c != -1) {
                    buffer.append((char)c);
                    c = System.in.read();
               return buffer.toString().trim();
          } catch (IOException e) {
               return "";
     } // end readEntry()
        public static void main( String[] args ) {
               VideoStore test = new VideoStore();
               test.addMember();
     } // end main
} // end VideoStore

Answer 1

As an unrelated aside, you should consider putting your statement close in a finally block, to guarantee that it is closed even if you get exceptions executing your SQL. While it won't matter much in this simple program, it's good technique.
          try {
               stmt.setInt(1, 15);
               stmt.setString(2, last);
               stmt.setString(3, first);
               stmt.setString(4, address);
               stmt.setInt(5, 0);
                        stmt.executeUpdate();
          } catch (SQLException e) {
               System.err.println("Error adding member");
                finally {
              try {
                   stmt.close();
              } catch (SQLException e) {
                   System.err.println("Caught SQLException: " + e.getMessage());
          }And it's also good practice to explicitly close your connection
Also, by default, JDBC executes with autocommit, which when you get to bigger projects is what you don't want, although here it's fine...