How do I fix java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1 error?

Question

So I already read the documentation and a bunch of tutorials on it but it's still not clicking in my head how to fix the "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1" error in my code since I can't for the life of me see anything wrong with it.

 public  HashMap<String, product> getAllProducts() {
            HashMap<String, product> productMap = new HashMap<String, product>();

            //create a file object from the external file
            File productFile = new File("src/main/resources/stock.sample.csv");

            // Catch Exception when reading the file using try-catch block
            try {
                // Read an external file: stock.sample.csv via Scanner
                Scanner scanner = new Scanner(productFile);
                while (scanner.hasNext()){
                    String fileRecord = scanner.nextLine();

                    String[] fileRecordSplit = fileRecord.split(",");

                    product product = new product();
                    product.setId(fileRecordSplit[0]);
                    product.setName(fileRecordSplit[1]); // Throws the java.lang.ArrayIndexOutOfBoundsException:
                    // Index 1 out of bounds for length 1
                    product.setCategory(fileRecordSplit[2]);

                    Price price = new Price();
                    price.setAmount(Double.parseDouble(fileRecordSplit[3]));

                    product.setPrice(price);
                           productMap.put(product.getId(), product);
                }

            } catch (FileNotFoundException e){
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return productMap;
        }
    }