Выпадающий список с из базы данных MySQL

@Entity
@Table(name = "type")
public class Type implements Serializable{
@Id
@Column(name = "ID")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
 
@Column(name = "sort")
private String sort;
 
@OneToOne
@JoinColumn(name = "categoryId")
private Category category;
 
public int getId() {
    return id;
}
 
public void setId(int id) {
    this.id = id;
}
 
public String getSort() {
    return sort;
}
 
public void setSort(String sort) {
    this.sort = sort;
}
 
public Category getCategory() {
    return category;
}
 
public void setCategory(Category category) {
    this.category = category;
}
 
@Override
public String toString() {
    return "Type{" +
            "id=" + id +
            ", sort='" + sort + '\'' +
            ", category=" + category +
            '}';
  }
}

@Entity
@Table(name = "category_production")
public class Category {
@Id
@Column(name = "ID")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
 
@Column(name = "category", unique = true)
private String name_category;
 
public int getId() {
    return id;
}
 
public void setId(int id) {
    this.id = id;
}
 
public String getName_category() {
    return name_category;
}
 
public void setName_category(String name_category) {
    this.name_category = name_category;
}
 
@Override
public String toString() {
    return "Category{" +
            "id=" + id +
            ", name_category='" + name_category + '\'' +
            '}';
  }
}

@Controller
public class TypeController {
 
private TypeService typeService;
 
@Autowired
@Qualifier(value = "typeService")
public void setTypeService(TypeService typeService) {
    this.typeService = typeService;
}
 
private CategoryService categoryService;
 
@Autowired
@Qualifier(value = "categoryService")
public void setCategoryService(CategoryService categoryService) {
    this.categoryService = categoryService;
}
 
@RequestMapping(value = "types", method = RequestMethod.GET)
public String listType(Model model){
    model.addAttribute("type", new Type());
    model.addAttribute("listType", this.typeService.listType());
 
    return "types";
}
 
@RequestMapping(value = "/types/add", method = RequestMethod.POST)
public String addType(@ModelAttribute("type") Type type,@ModelAttribute("category") Category category){
    if (type.getId()==0){
        this.typeService.addType(type);
        this.categoryService.addCategory(category);
    }else {
        this.typeService.updateType(type);
        this.categoryService.updateCategory(category);
    }
 
    return "redirect:/types";
}
 
@RequestMapping("/removetype/{id}")
public String removeType(@PathVariable("id") int id){
    this.typeService.removeType(id);
    this.categoryService.removeCategory(id);
 
    return "redirect:/types";
}
 
@RequestMapping("/edittype/{id}")
public String editType(@PathVariable("id") int id, Model model){
    model.addAttribute("type", this.typeService.getTypeById(id));
    model.addAttribute("listType", this.typeService.listType());
    model.addAttribute("category", this.categoryService.getCategoryById(id));
    model.addAttribute("listCategory", this.categoryService.listCategory());
 
    return "types";
}
 
 
@RequestMapping("typedata/{id}")
public String typeData(@PathVariable("id") int id, Model model){
    model.addAttribute("type", this.typeService.getTypeById(id));
 
    return "typedata";
 
  }
}