NoSuchElementException Error sentinel Loop

[jimgym1989]

 import java.io.*;
import java.util.*;
public class tryCountLetter {

    public static void main(String[]args) throws FileNotFoundException{
    	
    	Scanner inFile = new Scanner(new FileReader("D:\\My Documents\\Java Saves\\try.txt"));
	
	int counter = 0;
		
	String str=inFile.next();
		while(str!= "-999")
		{
		str = inFile.next();
		System.out.print(str.length());
		}
		inFile.close();
	}
       
    }

this is the error

Exception in thread "main" java.util.NoSuc hElementExcepti on
at java.util.Scann er.throwFor(Sca nner.java:817)
at java.util.Scann er.next(Scanner .java:1317)
at tryCountLetter. main(tryCountLe tter.java:22)

i dont get it?
why does it say NoSuchElementEx ception?

this is what's inside of the try.txt

Im a newbie -999

[JosAH]

You can't compare strings for (in)equality like you did in line twelve. Do this
instead:

[code=java]
while (!str.equals("-999"))
[/code]

kind regards,

Jos

[jimgym1989]

You can't compare strings for (in)equality like you did in line twelve. Do this
instead:

[code=java]
while (!str.equals("-999"))
[/code]

kind regards,

Jos

I still received the same error..
I don't get it..
thank you for you immediate response!!

[jimgym1989]

You can't compare strings for (in)equality like you did in line twelve. Do this
instead:

[code=java]
while (!str.equals("-999"))
[/code]

kind regards,

Jos

by the way i already solved it..thank any way :D

[JosAH]

by the way i already solved it..thank any way :D

So how did you solve it?

kind regards,

Jos