I'm working with the following programs: Specifically Tomcat 8, VirtualBox virtual machine, & Gson 2.3.1

I'm trying to test out a method in Gson that allows you marshall/unmarshall Java objects into the JSON format.

This is the code I am using this for (in order for it to compile properly, both classes of java code need to be compiling at the same time...:

Most importantly is my code for testing the JSON conversion method:

package com.cs330;
import com.google.gson.Gson;

    public class IngredientProto 
    {
        public static void main (String[] args)
        {
         Ingredient neo = new Ingredient(6, "cheddar cheese", "cheese");

         System.out.println("Object confirmed: " + neo.toString());

         //New GSON object for marshalling...
         Gson neoIngredient = new Gson();

         //Use said object to create the JSON formatted String for this Ingredient (Object).
         String jsonThis = neoIngredient.toJson(neo);

         //Printing out the new object (Ingredient)...
         System.out.println ("Object formatted to JSON: " + jsonThis);

         //Convert Back via unmarshalling. NOW!
         Ingredient orga = neoIngredient.fromJson(jsonThis, Ingredient.class);

         //Print Again!
         System.out.println("Reverting back into Object variable: " + orga.toString());
       }
      }

Here, for reference, is my code for the Ingredient Class I'm working with...

package com.cs330;
import java.util.Scanner;

public class Ingredient //implements Comparable<Ingredient>
{
 private int ingredientID;
 private String ingredientName;
 protected String ingredientType;

  //DEFAULT CONSTRUCTOR 
  Ingredient()
  {
   this.ingredientID = 0;
   this.ingredientName = "No Ingredient";
   this.ingredientType = "No Type";
  }

  //CONSTRUCTOR 1 - Parameters for Name, ID, and Type.
  Ingredient(int ingredientID, String ingredientName, String ingredientType)
  {
   setIngredientID(ingredientID);
   setIngredientName(ingredientName);
   setIngredientType(ingredientType);
  }

  //CONSTRUCTOR 2 - Parameters for Name and Type.
  Ingredient(String ingredientName, String ingredientType)
  {
   this.ingredientID = 0;
   setIngredientName(ingredientName);
   setIngredientType(ingredientType);
  }

  //Getters and Setters Go here.

      //TO STRING
      public String toString()
      {
       String results = " ";
        results = this.ingredientID + ": " + this.ingredientName
                   + " (" + this.ingredientType + ") ";
       return results;
      }//END toSTRING

     //...Main for testing...

}//END PROGRAM

The errors I keep getting involve the following whenever I try to compile them in CMD on my virtual machine:

1. error: package com.google.gson does not exist - I have import com.google.gson.Gson where it needs to be in my program, yet I keep getting this error my code has nothing wrong with it...
2. error: class, interface, or enum expected - I actually add package com.google.gson, and I get this error despite everything else being right.

Both errors happen when I try to test the Gson program code out, alongside the Ingredient class I created. My real concern is how I can effectively deal with this...