Deu erro

Estou usando a mesma versão que o professor pediu e deu esse erro na hora de executar.

public class TestaConexao {

public static void main(String[] args) throws SQLException {

    Connection connection = DriverManager
            .getConnection("jdbc:mysql://localhost/loja_virtual?useTimezone=true&serverTimezone=UTC", "root", "root");

    System.out.println("Fechando a conexão!!");

    connection.close();
}

}

Exception in thread "main" java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:827)
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:447)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:237)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:251)
    at com.mysql.cj.jdbc.admin.TimezoneDump.main(TimezoneDump.java:70)