@Override
    public String getIdentifier() {
        return "mysql";
    }
Creates a new MySQLAuthenticationProvider that reads and writes
authentication data to a MySQL database defined by properties in
guacamole.properties.

@throws GuacamoleException
    If a required property is missing, or an error occurs while parsing
    a property.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/java/org/apache/guacamole/auth/mysql/MySQLAuthenticationProvider.java