What scenario would create an nosuchelementexception with nextLine()?

The documentation for nextLine() says that it can throw a nosuchelementexception. But when using the nextLine() to get input for the Scanner as demonstrated in the following code, the nosuchelementexception is not thrown, The only thing that happens is by pressing "Enter" two times the programs just ends. I submitted the same code for an evaluation to an online system, there also the system said that the code throws a nosuchelementexception

What sort of an input would produce a nosuchelementexception?

String input = "";
Scanner sc = new Scanner(System.in);

input += sc.nextLine() + " ";
input += sc.nextLine() + " ";

System.out.println(input);

Here’s an example where the standard input (i.e. System.in) is piped from another application:

echo 'one line only' | java Read

Or read from a file:

java Read <file_with_one_line.txt

Or using interactive user input:

java Read

<pre><kbd>I am entering one line</kbd>
<kbd>Ctrl</kbd>+<kbd>D</kbd></pre>

These examples assume that you’ve compiled the code you’ve posted (wrapped into a class Read) to Read.class in the same directory.

import java.util.Scanner;

class Read {
    public static void main(String[] args) {
        String input = "";
        Scanner sc = new Scanner(System.in);

        input += sc.nextLine() + " ";
        input += sc.nextLine() + " ";

        System.out.println(input);
    }
}

javac read.java

I think this is possible when reading files:

I created a new txt-file without any content (test.txt) in it and ran the following code:

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;

public class Test {
	public static void main(String[] args) throws FileNotFoundException {
		File file = new File("test.txt");
		Scanner sc = new Scanner(file);
		String str = sc.nextLine();
	}
}

The result:

Exception in thread "main" java.util.NoSuchElementException: No line found
	at java.base/java.util.Scanner.nextLine(Scanner.java:1651)
	at Test.main(Test.java:9)

Edit

It can also appear with System.in because when closing one scanner it appears to also close System.in.

Consider the following code:

import java.util.Scanner;
import java.io.FileNotFoundException;

public class Test {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner sc = new Scanner(System.in);
		Scanner sc2 = new Scanner(System.in);
		sc.nextLine();
		sc.close();
		sc2.nextLine();
	}
}

This throws the following exception:

Exception in thread "main" java.util.NoSuchElementException: No line found
	at java.base/java.util.Scanner.nextLine(Scanner.java:1651)
	at Test.main(Test.java:10)

This happens because sc (with access to System.in) was closed. This causes that System.in is not accessible anymore and therefore sc2 doesn't work properly and throws an exception.