How to avoid NullPointerException in Console class in Java?

I was reading an article on ways to read input from the user when I came across a method which said "Using Console Class."

// Java program to demonstrate working of System.console()
// Note that this program does not work on IDEs as
// System.console() may require console
public class Sample {
    public static void main(String[] args)
    {
        // Using Console to input data from user
        String name = System.console().readLine();

        System.out.println("You entered string " + name);
    }
}

When I tried to run the above code on an online, interactive compiler it's giving the error: Exception in thread "main" java.lang.NullPointerException at Sample.main(Sample.java:8)

Why is this happening?

I also tried to create an object of Console class and then call the .readLine() function but it gave me the same error.

Online compiler: https://www.interviewbit.com/online-java-compiler/