DisposableEngine.java

public class DisposableEngine extends Engine {

	public void dispose() {
		ImmutableArray<Entity> entities = getEntities();
		for (Entity e : entities) {
			ImmutableArray<Component> components = e.getComponents();
			for (Component component : components) {
				if (!(component instanceof Disposable)) continue;
				Disposable disposable = (Disposable) component;
				disposable.dispose();
				Gdx.app.log("Disposed", disposable.toString());
			}
		}
	}

}

DrawingComponent.java

public class DrawingComponent implements Component, Disposable {

	public Sprite sprite = new Sprite();

	public void dispose() {
		sprite.getTexture().dispose();
	}

}