MapStruct 地图集<Dto>设置<Enum>

Question

I want to convert UserDto to User

UserDto:

public class UserDto {
   private String username;
   private String password;
   private Set<RoleDto> roles;
   //getters and setters
}

RoleDto:

public class RoleDto {
   private String name;
   //getters and setters
}

User:

public class User {
   private String username;
   private String password;
   private Set<Role>;
   //getters and setters
}

Role:

public enum Role {
   private String name;
   //getters
}

My mapper class:

@Mapper(componentModel = "spring")
public interface UserMapper {
    UserDto toDto(User user);
    User fromDto(UserDto userDto); //error here
}

But after maven install i had problem:

Error: java: Role does not have an accessible parameterless constructor.

Because Role is enum, I can't create public constructor. I tried use:

@Mapping(source = "roles", targer = "roles")
User fromDto(UserDto userDto);

And

@Mapping(source = "userDto.roles", targer = "user.roles")
User fromDto(UserDto userDto);

But it had no effect. How can i fix it?

Answer 1

I took the advice of @Rup and modified my Role class to:

public class Role {
   private String name;
   // getters and setters
}