ошибка java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

Внезапно перестал работать программа выдает ошибку

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

@WebServlet(urlPatterns = "/day")
public class Servlet extends HttpServlet {
    protected String resQ = null;
    GregorianCalendar calendar = new GregorianCalendar();
    int dayID = calendar.get(Calendar.DAY_OF_MONTH); //
    private static final String URL = "jdbc:mysql://localhost:3306/DataBase";
    private static final String USER = "root";
    private static final String PASSWORD = "root";
    private Connection currentConnect;
    public void initDisconnection() throws Exception {
        currentConnect.close();
    }
    public void initConnection() throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        currentConnect = DriverManager.getConnection(URL, USER, PASSWORD);
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        try {
            initConnection();
        Statement statement = currentConnect.createStatement();
        String query = ("select * from db_predict.db_predict WHERE ID =" + dayID);
        ResultSet resultQuery = statement.executeQuery(query);
        while (resultQuery.next()) {
            resQ = resultQuery.getString("Text");
        }
        initDisconnection();
        } catch (Exception e) {
        e.printStackTrace();
    }
        PrintWriter out = response.getWriter();
        out.println("<h1>" + resQ + "</h1>");  //Вывод на экран текста
    }
}

Как можно исправить ошибку? Для сборки использовал Мaven.