Java says FileNotFoundException but file exists



I have an assignment for my CS class where it says to read a file with several test scores and asks me to sum and average them. While summing and averaging is easy, I am having problems with the file reading. The instructor said to use this syntax

Scanner scores = new Scanner(new File("scores.dat"));

However, this throws a FileNotFoundException, but I have checked over and over again to see if the file exists in the current folder, and after that, I figured that it had to do something with the permissions. I changed the permissions for read and write for everyone, but it still did not work and it still keeps throwing the error. Does anyone have any idea why this may be occurring?

EDIT: It was actually pointing to a directory up, however, I have fixed that problem. Now file.exists() returns true, but when I try to put it in the Scanner, it throws the FileNotFoundException

Here is all my code

import java.util.Scanner;
import java.io.*;
public class readInt{
        public static void main(String args[]){
                File file = new File("lines.txt");
                System.out.println(file.exists());
                Scanner scan = new Scanner(file);
        }
}

Answer

There are a number situation where a FileNotFoundException may be thrown at runtime.

  1. The named file does not exist. This could be for a number of reasons including:

    • The pathname is simply wrong
    • The pathname looks correct but is actually wrong because it contains non-printing characters (or homoglyphs) that you did not notice
    • The pathname is relative, and it doesn’t resolve correctly relative to the actual current directory of the running application. This typically happens because the application’s current directory is not what you are expecting or assuming.
    • The path to the file is is broken; e.g. a directory name of the path is incorrect, a symbolic link on the path is broken, or there is a permission problem with one of the path components.
  2. The named file is actually a directory.

  3. The named file cannot be opened for reading for some reason.

The good news that, the problem will inevitably be one of the above. It is just a matter of working out which. Here are some things that you can try:

  • Calling file.exists() will tell you if any file system object exists with the given name / pathname.
  • Calling file.isDirectory() will test if it is a directory.
  • Calling file.canRead() will test if it is a readable file.
  • This line will tell you what the current directory is:

    System.out.println(new File(".").getAbsolutePath());
    
  • This line will print out the pathname in a way that makes it easier to spot things like unexpected leading or trainiong whitespace:

    System.out.println("The path is '" + path + "'");
    

    Look for unexpected spaces, line breaks, etc in the output.


It turns out that your example code has a compilation error.

I ran your code without taking care of the complaint from Netbeans, only to get the following exception message:

Exception in thread “main” java.lang.RuntimeException: Uncompilable source code – unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown

If you change your code to the following, it will fix that problem.

public static void main(String[] args) throws FileNotFoundException {    
    File file = new File("scores.dat");
    System.out.println(file.exists());
    Scanner scan = new Scanner(file);
}

Explanation: the Scanner(File) constructor is declared as throwing the FileNotFoundException exception. (It happens the scanner it cannot open the file.) Now FileNotFoundException is a checked exception. That means that a method in which the exception may be thrown must either catch the exception or declare it in the throws clause. The above fix takes the latter approach.



Source: stackoverflow