Exception in thread "main" java.lang.NoSuchMethodError?

Question

This is the exact same error I recieved from running ListGames:
Exception in thread "main" java.lang.NoSuchMethodError: ListGames.getConnection(Ljava/lang/String;)Ljava/sql/Connection;
at ListGames.getGames(ListGames.java:21)
at ListGames.main(ListGames.java:7)
What's wrong?
ListGames.java:
import java.sql.*;
import java.text.NumberFormat;
import ...util.MysqlConnection; // purposely incomplete
public class ListGames {
     static Connection conn = MysqlConnection.openMysqlConnection("ds_games");
     public static void main(String args[]) {
          NumberFormat cf = NumberFormat.getCurrencyInstance();
          ResultSet games = getGames();
          try {
               while (games.next()) {
                    Game g = getGame(games);
                    String msg = Integer.toString(g.year) + ": " + g.title + " (" + cf.format(g.price) + ")";
                    System.out.println(msg);
          } catch (SQLException e) {
               e.printStackTrace();
               conn = MysqlConnection.closeMysqlConnection(conn);
     private static ResultSet getGames() {          
          try {
               Statement s = conn.createStatement();
               ResultSet rows = s.executeQuery("select title, year, price from my_ds_games order by year, price, title");
               return rows;
          } catch (SQLException e) {
               e.printStackTrace();
               conn = MysqlConnection.closeMysqlConnection(conn);
          return null;
     private static Game getGame(ResultSet games) {
          try {
               String title = games.getString("Title");
               int year = games.getInt("Year");
               double price = games.getDouble("Price");
               return new Game(title, year, price);
          } catch (SQLException e) {
               e.printStackTrace();
               conn = MysqlConnection.closeMysqlConnection(conn);
          return null;
     private static class Game {
          public String title;
          public int year;
          public double price;
          public Game(String title, int year, double price) {
               this.title = title;
               this.year = year;
               this.price = price;
MysqlConnection.java:
package ...util; // purposely incomplete
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public final class MysqlConnection {     
     public static final Connection openMysqlConnection(String database) {
          Connection conn = null;
          try {
               Class.forName("com.mysql.jdbc.Driver");
               conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/" + database, user, password); // username and password purposely uninitialized
          } catch(SQLException e) {
               System.out.println("SQLException: " + e.getMessage());
               System.out.println("SQLState: " + e.getSQLState());
               System.out.println("VendorError: " + e.getErrorCode());
          } catch(Exception e) {
               e.printStackTrace();
          } finally {
               return conn;
     public static final Connection closeMysqlConnection(Connection conn) {
          try {
               if (conn != null) {
                    conn.close();
                    if (conn == null) {
                         System.out.println("Conection Closed");
          } catch (SQLException e) {
               e.printStackTrace();
          } finally {
               return null;
}

Answer 1

Darkstar444 wrote:
I deleted ListGames.class, ListGames$Games.class, and MysqlConnection.class but still the same thing.Then you didn't delete the version of ListGames.class which is actually being used when you run your application. This suggests that your classpath is pointing to an old version as well as to the version produced currently by the compiler. Or that there's an old version which you put into the Java extensions directory.