import java.sql.*;

public class JDBC {
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DATABASE_URL = "jdbc:mysql://localhost/Shortener";
    static final String USER_NAME = "Albuquerque";
    static final String USER_PASSWORD = "rootpasswordgiven";

    public static String dataFromDB(String data) {
        System.out.println("Registering JDBC driver and connection...");
        try {
            Class.forName(JDBC_DRIVER);
        } catch(ClassNotFoundException e) {
            e.printStackTrace();
        }
        System.out.println("Registering Statement...");
        ResultSet resultSet = null;
        try (Connection connection = DriverManager.getConnection(DATABASE_URL, USER_NAME, USER_PASSWORD);
             Statement statement = connection.createStatement();
        ) {
            if (isID(data)) {
                String sqlQueryID = String.format("SELECT strings FROM ShortenerStrings WHERE id = %s", data);
                resultSet = statement.executeQuery(sqlQueryID);
                return resultSet.getInt("id") + "";
            } else {
                String sqlQuerySTRING = String.format("SELECT id FROM ShortenerStrings WHERE strings = %s", data);
                resultSet = statement.executeQuery(sqlQuerySTRING);
                return resultSet.getString("Strings") + "";
            }
        } catch(SQLException e) {
            e.printStackTrace();
        }

        return null;
    }

    private static boolean isID(String data) {
        for(int i = 0; i < data.length(); ++i) {
            if (!Character.isDigit(data.charAt(i)))
                return false;
        }
        return true;
    }
}

Registering JDBC driver and connection...
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at webserver.JDBC.dataFromDB(JDBC.java:14)
    at source_code.Solution.main(Solution.java:30)
Registering Statement...
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/Shortener
    at java.sql.DriverManager.getConnection(DriverManager.java:689)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at webserver.JDBC.dataFromDB(JDBC.java:20)
    at source_code.Solution.main(Solution.java:30)
null