Code compiles - throws java.lang.NullPointerException

Question

This program is intended to build an array and populate it with inventory, then print out the inventory line item by line item. The code compiles but throws the NullPointerException error when the program is run. Here is the main method with 2 classes, as well as the text from the error and a pointer to the specific place in the code the error is from...
main method
import java.util.Scanner;
import static java.lang.System.out;
import java.io.*;
public class Inventory1
    private static void Exit() //set ability for program to exit on each loop
    { out.println("We hope this inventory program was " +
                       "helpful. Thank you for using our program.");
      System.exit(0);
  public static void main (String [] args)
      boolean validNumber;
      boolean validCount;
      boolean validDollars;
      //initialize scanner
  Scanner sc = new Scanner(System.in);        
  Music info = new Music();
  //declare and initialize variables
  int[] itemNumber = new int [5];
  String[] productName = new String[5];
  int[] stockAmount = new int[5];
  double[] productCost = new double[5];
  double[] totalValue = new double[5];
  while (true)
      for (int i=0; i<5; i++)
        out.println( "Enter CD name/description or 'exit' to stop the" +
                " program: "); //prompt - product name
           info.productName[i] = sc.next(); // input
           if (info.productName.equalsIgnoreCase("exit"))
out.println("Exit entered. ");
Exit();
else
do
out.println("Please enter CD number: "); //prompt - item number
info.itemNumber[i] = sc.nextInt();
validNumber = true;
if( (info.itemNumber[i] <1 ) )
{//make sure product number is positive number
validNumber = false;
out.println("All CDs have positive numbers and no other " +
"characters. Please enter a valid CD number.");
}while (!validNumber);
do
out.println("Quantity in stock: "); // prompt - quantity
info.stockAmount [i] = (sc.nextInt()); // capture temp number to verify
validCount = true;
if(( info.stockAmount[i] <1 ))
{ // ensure stock amount is positive number
validCount = false;
out.println( "Inventory numbers must be positive. Please " +
"enter a correct value." ); // prompt for correct #
} while (!validCount);
do
out.println("What is the product cost for each unit? "); // prompt - cost
info.productCost[i] = sc.nextDouble();
validDollars = true;
if (( info.productCost[i] <1 ))
validDollars = false;
out.println( "Product cost must be a positive dollar " +
"amount. Please enter correct product cost." );
} while (!validDollars);
out.println(totalValue);
@Override
public String toString()
return super.toString();
Music classclass Music
String productName[];
String title;
int itemNumber[];
int item;
int stockAmount[];
int amount;
double productCost[];
double cost;
double totalValue[];
double value;
int i;
public Music(String title, int item, int amount, double cost, double value,
int i)
this.productName[i] = title;
this.itemNumber[i] = item;
this.stockAmount[i] = amount;
this.productCost[i] = cost;
this.totalValue[i] = value;
public Music()
public void setTotalValue(double[] totalValue)
this.totalValue = totalValue;
public double[] getTotalValue()
return totalValue;
public void setStockAmount(int[] stockAmount)
this.stockAmount = stockAmount;
public int[] getStockAmount()
return stockAmount;
public void setProductCost(double[] productCost)
this.productCost = productCost;
public double[] getProductCost()
return productCost;
public void setProductName(String[] productName)
this.productName = productName;
public String[] getProductName()
return productName;
public void setItemNumber (int[] itemNumber)
this.itemNumber = itemNumber;
public int[] getItemNumber()
return itemNumber;
}TotalInventory classclass TotalInventory
double TotalInfo;
public int [] getStockAmount(int[] units)
int[] stockAmount = units;
return units;
public double[] getTotalValue(double[] cost)
double[] productCost = cost;
return cost;
error message
init:
deps-jar:
Compiling 1 source file to C:\Documents and Settings\Tammy\My Documents\School\JavaProgramming\Inventory\build\classes
compile:
run:
Enter CD name/description or 'exit' to stop the program:
here we go
Exception in thread "main" java.lang.NullPointerException
        at Inventory1.main(Inventory1.java:54)
Java Result: 1
BUILD SUCCESSFUL (total time: 4 seconds)
Inventory1.main(Inventory1.java:54) is this line of code in the main method: info.productName[i] = sc.next(); // input Any suggestions?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

I have not changed my code from when I supplied it in the first post - I am simply pointing out that I already initiated the String with 5 as the number...I've supplied you with everything I am getting. The three modules are in the original post, as is the error message being received - nothing has changed.
This means with the code posted in my original question I am getting an NPE. I compile the code and run it. I'm able to input the "title" (productName) after the prompt but then get the NPE. I'm not trying to make you read my mind, I'm just asking for help and make every effort to provide as much detail as possible to make that easier on all of us.