Exception in thread "main" java.lang.NullPointerException [java]

I have task to do and I have problem with one point and I'm getting error. I havve no idea how to repair it:

Exception in thread "main" java.lang.NullPointerException at test.main(test.java:29)

Here's my code:

import java.util.Scanner;


public class test
{

    static int size;
    static String[] productDescription;     

    public static void readProductsData()
    {
        Scanner data = new Scanner(System.in);
        System.out.print("Array size: ");                   
        size = data.nextInt();

        String[] productDescription = new String[size];

        for(int i = 0; i < size; i++)
        {
            System.out.print("Product name: ");
            productDescription[i] = data.next();
        }

        for(int i = 0; i < size; i++)
            System.out.println(productDescription[i]);
    }

    public static void main(String[] args)
    {
        readProductsData();
        System.out.println(productDescription[0]);
    }
}