compare wrongly returns UNTOUCHED

[Kira-Cesonia]

I have two quite different objects

	public static GameCharacter sylvia() {
		
		String characterName = "Sylvia the Hero";
		
		String weaponName = "Gryphclaw";
		int attack = 255;
		Weapon weapon = new Weapon(weaponName, attack);
		
		String armorName = "Starscale Armor";
		int defense = 231;
		Armor armor = new Armor(armorName, defense);
		
		String _id = "sylv01";
		
		List<Item> inventory = new ArrayList<Item>();
		Potion potion = new Potion("Hi-Potion", 3);
		inventory.add(potion);
		Ether ether = new Ether("Mega Ether", 5, 200);
		inventory.add(ether);
		
		GameCharacter sylvia = new GameCharacter(characterName, weapon, armor, _id, inventory);
		return sylvia;
	}
	
	public static GameCharacter sylviaEdited() {
		
		String characterName = "Sylvia Zerin";
		
		String weaponName = "Luberjack's Axe";
		int attack = 7;
		Weapon weapon = new Weapon(weaponName, attack);
		
		String armorName = "Crude Mazoiscale Armor";
		int defense = 13;
		Armor armor = new Armor(armorName, defense);
		
		String _id = "sylv01";
		
		List<Item> inventory = new ArrayList<Item>();
		Potion potion = new Potion("Hi-Potion", 2);
		inventory.add(potion);
		Tonic tonic = new Tonic("Full Tonic", 2, 100);
		inventory.add(tonic);
		
		GameCharacter sylvia = new GameCharacter(characterName, weapon, armor, _id, inventory);
		return sylvia;
	}

When comparing them like this:

		GameCharacter sylvia = GameCharacters.sylvia();
		GameCharacter sylviaEdited = GameCharacters.sylviaEdited();
		
		DiffNode cityDelta
			= objectDiffer.compare(sylvia, sylviaEdited);

...the resulting DiffNode tells reads / => UNTOUCHED, even though the two compared objects are quite different.

Looking through the issues, I have found mentions of this being because the objects are POJOs and not JavaBeans. I have also seen mention of an Introspector and the IntrospectionConfiguration. I have been trying to figure something out with this, but have not come to a solution.

Is it possible to adequately compare objects like these?

public class GameCharacter {
	@Id
	public String _id;
	public String name;
	public Weapon weapon;
	public Armor armor;
	public List<Item> inventory;
	
	public GameCharacter() {
		
	}
	
	public GameCharacter(String name, Weapon weapon, Armor armor, String _id, List<Item> inventory) {
		this._id = _id;
		this.name = name;
		this.weapon = weapon;
		this.armor = armor;
		this.inventory = inventory;
	}
}

The main question here is if it is possible to somehow use java-object-diff without the need to implement getters and setters.

For reference, you can find all the files and my attempts in the following repository:
https://github.com/Kira-Cesonia/tri-JaDe
Check out the delta.DeltaApplierTest