Error message "Scanner cannot be resolved into a class" in Java.

[Harrison_Selle]

Edit: oops meant to title "Scanner object cannot be resolved into a type"

I am trying to use the Scanner object in Java for a homework assignment.
Here's the program. It's written on notepad but compiled and run on a server belonging to the school.

import java.util.Scanner;
class Palindrome
{
public static boolean isPalindrome(String s)
{
    if (s.length() <= 1)
    {
        return true; //base case
    }
    else if(s.charAt(s.length()) == s.charAt(0))
    {
        isPalindrome(s.substring(1, s.length() - 1)); //passes a new substring excluding first and last character
    }
}
public static void main (String [] args)
{
    System.out.println("Please input a string to see if it is a palindrome!");
    Scanner keyboard = new Scanner(System.in);
    String input = keyboard.nextLine();
    
    if (isPalindrome(input) == true)
    {
        System.out.println(input + " is a palindrome!");
    }
    else
    {
        System.out.println(input + " is not a palindrome!");
    }
}
}

I was using Scanner without any problems last semester but upon compiling the program on the schools server I got this error.
Here's what happens when I type the command "java -version"

java version "1.5.0"
gij (GNU libgcj) version 4.2.4 (Ubuntu 4.2.4-1ubuntu3

)

And here's "javac -version"

gcj-4.2 (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu3)

The javac command only showing some ubuntu info troubles me, but I don't understand how that could be a problem on my end, seeing as how the programs are compiled and run on a different machine. I messed around with Eclipse a while ago, did I screw something up with the version of the compiler? I don't see how that would affect anything outside of Eclipse though...
Thanks for the help.