NullPointerException in Eclipse but not in command promt

I'm a beginner. Just wondering why this code works perfectly fine in windows command prompt, but I get an:

Exception in thread "main" java.lang.NullPointerException
  at Test1.main(Test1.java:13)

error in eclipse. This has happened a lot to me, and it's really stopping me from using eclipse.

Here's the code:

import java.io.Console;

public class Test1 {

    public static void main(String[] args) {        
        Console myConsole = System.console();

        for (int a = 0; a < 10; a++){           
            int a2 = a * a;         
            myConsole.printf("\n%d squared is: %d.",a,a2); //Problem with this line
        }       
        System.exit(0);
    }
}