Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemExc­eption: Error accessing field

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemException: Error accessing field [private final java.lang.String org.server.models.Ingredient.id] by reflection for persistent property [org.server.models.Ingredient#id] : GRBF; nested exception is org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private final java.lang.String org.server.models.Ingredient.id] by reflection for persistent property [org.server.models.Ingredient#id] : GRBF
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

@Data
@RequiredArgsConstructor
@NoArgsConstructor(access = AccessLevel.PRIVATE, force = true)
@Entity
public class Ingredient {
 
    @Id
    @Column(columnDefinition = "String", name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private final String id;
    private final String name;
    @Enumerated(EnumType.STRING)
    private final Type type;
 
    public static enum Type{
        WRAP, PROTEIN, VEGGIES, CHEESE, SAUCE
    }
 
}

@Data
@Entity
@Table(name = "taco", schema = "public")
public class Taco {
 
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private Date createdAt;
    @NotNull
    @Size(min = 3, message="Name must be at least 3 characters long")
    private String name;
    @ManyToMany(targetEntity = Ingredient.class)
    @Size(min=1, message="You must choose at least 1 ingredient")
    private List<String> ingredients;
 
    @PrePersist
    void createdAt(){
        this.createdAt = new Date();
    }
 
}

@Controller
@RequestMapping("/design")
@SessionAttributes("order")
public class DesignTacoController {
 
    private final IngredientRepository ingredientRepository;
    private final TacoRepository tacoRepository;
 
    @Autowired
    public DesignTacoController(IngredientRepository ingredientRepository, TacoRepository tacoRepository) {
        this.ingredientRepository = ingredientRepository;
        this.tacoRepository = tacoRepository;
    }
 
    @ModelAttribute(name = "order")
    public Order order(){
        return new Order();
    }
 
    @GetMapping
    public String showDesignForm(Model model){
        List<Ingredient> ingredients = new ArrayList<>();
        ingredientRepository.findAll().forEach(i -> ingredients.add(i));
 
        Type[] types = Ingredient.Type.values();
        for (Type type : types){
            model.addAttribute(type.toString().toLowerCase(),
                    filterByType(ingredients, type));
        }
        return "welcomePage";
    }
 
    private List<Ingredient> filterByType(List<Ingredient> ingredients, Type type) {
        return ingredients
                .stream()
                .filter(x -> x.getType().equals(type))
                .collect(Collectors.toList());
    }
 
    @ModelAttribute(name = "taco")
    public Taco taco(){
        return new Taco();
    }
 
    @PostMapping
    public String processDesign(@Valid Taco taco, Errors errors, @ModelAttribute Order order){
        if(errors.hasErrors()) {
            return "welcomePage";
        }
        Taco saved = tacoRepository.save(taco);
        order.addDesign(saved);
        return "redirect:/orders/current";
    }
}

private List<String> ingredients; на private List<Ingredient> ingredients;

@Component
public class IngredientByIdConverter implements Converter<String, Ingredient>{
 
    private final IngredientRepository ingredientRepo;
 
    @Autowired
    public IngredientByIdConverter(IngredientRepository ingredientRepo) {
        this.ingredientRepo = ingredientRepo;
    }
 
    @Override
    public Ingredient convert(String id) {
        Optional<Ingredient> optionalIngredient = ingredientRepo.findById(id);
        return optionalIngredient.isPresent() ?
                optionalIngredient.get() : null;
    }
 
}

 @Autowired
    private IngredientRepository ingredientRepository;
 
    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new IngredientByIdConverter(ingredientRepository));
    }