Java 无法解决REST API中的一般错误

我正在创建一个RESTWeb服务，其中一个应用程序用户可以使用泛型拥有多个角色

我陷入了困境，需要帮助才能继续前进。请检查下面我得到编译错误的代码

我的业务逻辑如下所示：

• AppUserResource

  将使用REST中的JSON数据进行映射
• Api将调用服务方法来创建用户
• 服务将创建实体对象以保存在数据库中

我在服务方法中遇到以下错误，如下代码所示：

此处编译失败setRoles（Set）不是 适用于参数（Set）

使用的界面

   public interface AppUserRole {
        void setRole(UserRole role);
    }
    public interface AppUser<T extends AppUserRole> {
        void setRoles(Set<T> appUserRoles);
    }

    public interface AppUserService <T extends AppUser<AppUserRole>>{
        T create(T username) throws Exception;
    }

    // App user resource will get JSON data from REST
    public class AppUserResource implements AppUser<AppUserRoleResource> {
        //An app user can have mutilple roles
        Set<AppUserRoleResource> roles;
        public void setRoles(Set<AppUserRoleResource> appUserRoles) {
        this.roles = appUserRoles;
        }
    }
    public class AppUserRoleResource extends DefaultResource implements AppUserRole {
        private UserRole role;
        public UserRole getRole() {
            return role;
        }
        public void setRole(UserRole role) {
            this.role = role;
        }

    }

    // Api will call service method to create user
    @RestController
    @RequestMapping(value = "/rest/users", produces = { APPLICATION_JSON_VALUE })
    public class AppUserApi {
    private AppUserService service;
    @RequestMapping(consumes = { APPLICATION_JSON_VALUE }, method = RequestMethod.POST)
    public void create(@RequestBody AppUserResource res) throws Exception {
            service.create(res);
    }
    }

    //Service will create entity object to save in data base
    public class AppUserServiceImpl implements AppUserService {
        public AppUser<AppUserRole> create(AppUserResource username) throws Exception {
            AppUserEntity obj = new AppUserEntity();
 // Compilation fails here setRoles(Set< AppUserRoleEntity >) not  
 // applicable for the arguments (Set< AppUserRoleResource >)
            obj.setRoles( username.getRoles());
            appUserRepository.save(obj);

        }

    }

    public class AppUserEntity implements AppUser<AppUserRoleEntity> {
        private Set<AppUserRoleEntity> appUserRoles;
        public void setRoles(Set<AppUserRoleEntity> appUserRoles) {
            this.appUserRoles = appUserRoles;
        }
    }
    public class AppUserRoleEntity implements AppUserRole {
        private UserRole role;
        private AppUserEntity appUser;
        public void setRole(UserRole role) {
            this.role = role;

        }

使用的服务

   public interface AppUserRole {
        void setRole(UserRole role);
    }
    public interface AppUser<T extends AppUserRole> {
        void setRoles(Set<T> appUserRoles);
    }

    public interface AppUserService <T extends AppUser<AppUserRole>>{
        T create(T username) throws Exception;
    }

    // App user resource will get JSON data from REST
    public class AppUserResource implements AppUser<AppUserRoleResource> {
        //An app user can have mutilple roles
        Set<AppUserRoleResource> roles;
        public void setRoles(Set<AppUserRoleResource> appUserRoles) {
        this.roles = appUserRoles;
        }
    }
    public class AppUserRoleResource extends DefaultResource implements AppUserRole {
        private UserRole role;
        public UserRole getRole() {
            return role;
        }
        public void setRole(UserRole role) {
            this.role = role;
        }

    }

    // Api will call service method to create user
    @RestController
    @RequestMapping(value = "/rest/users", produces = { APPLICATION_JSON_VALUE })
    public class AppUserApi {
    private AppUserService service;
    @RequestMapping(consumes = { APPLICATION_JSON_VALUE }, method = RequestMethod.POST)
    public void create(@RequestBody AppUserResource res) throws Exception {
            service.create(res);
    }
    }

    //Service will create entity object to save in data base
    public class AppUserServiceImpl implements AppUserService {
        public AppUser<AppUserRole> create(AppUserResource username) throws Exception {
            AppUserEntity obj = new AppUserEntity();
 // Compilation fails here setRoles(Set< AppUserRoleEntity >) not  
 // applicable for the arguments (Set< AppUserRoleResource >)
            obj.setRoles( username.getRoles());
            appUserRepository.save(obj);

        }

    }

    public class AppUserEntity implements AppUser<AppUserRoleEntity> {
        private Set<AppUserRoleEntity> appUserRoles;
        public void setRoles(Set<AppUserRoleEntity> appUserRoles) {
            this.appUserRoles = appUserRoles;
        }
    }
    public class AppUserRoleEntity implements AppUserRole {
        private UserRole role;
        private AppUserEntity appUser;
        public void setRole(UserRole role) {
            this.role = role;

        }

//服务将创建实体对象以保存在数据库中
公共类AppUserServiceImpl实现AppUserService{
公共AppUser创建（AppUserResource用户名）引发异常{
AppUserEntity obj=新的AppUserEntity（）；
//此处编译失败setRoles（Set）不是
//适用于参数（Set）
obj.setRoles（username.getRoles（））；
appUserRepository.save（obj）；
}
}

使用的实体

   public interface AppUserRole {
        void setRole(UserRole role);
    }
    public interface AppUser<T extends AppUserRole> {
        void setRoles(Set<T> appUserRoles);
    }

    public interface AppUserService <T extends AppUser<AppUserRole>>{
        T create(T username) throws Exception;
    }

    // App user resource will get JSON data from REST
    public class AppUserResource implements AppUser<AppUserRoleResource> {
        //An app user can have mutilple roles
        Set<AppUserRoleResource> roles;
        public void setRoles(Set<AppUserRoleResource> appUserRoles) {
        this.roles = appUserRoles;
        }
    }
    public class AppUserRoleResource extends DefaultResource implements AppUserRole {
        private UserRole role;
        public UserRole getRole() {
            return role;
        }
        public void setRole(UserRole role) {
            this.role = role;
        }

    }

    // Api will call service method to create user
    @RestController
    @RequestMapping(value = "/rest/users", produces = { APPLICATION_JSON_VALUE })
    public class AppUserApi {
    private AppUserService service;
    @RequestMapping(consumes = { APPLICATION_JSON_VALUE }, method = RequestMethod.POST)
    public void create(@RequestBody AppUserResource res) throws Exception {
            service.create(res);
    }
    }

    //Service will create entity object to save in data base
    public class AppUserServiceImpl implements AppUserService {
        public AppUser<AppUserRole> create(AppUserResource username) throws Exception {
            AppUserEntity obj = new AppUserEntity();
 // Compilation fails here setRoles(Set< AppUserRoleEntity >) not  
 // applicable for the arguments (Set< AppUserRoleResource >)
            obj.setRoles( username.getRoles());
            appUserRepository.save(obj);

        }

    }

    public class AppUserEntity implements AppUser<AppUserRoleEntity> {
        private Set<AppUserRoleEntity> appUserRoles;
        public void setRoles(Set<AppUserRoleEntity> appUserRoles) {
            this.appUserRoles = appUserRoles;
        }
    }
    public class AppUserRoleEntity implements AppUserRole {
        private UserRole role;
        private AppUserEntity appUser;
        public void setRole(UserRole role) {
            this.role = role;

        }

public class AppUserEntity实现AppUser{
私有设置appUserRoles；
public void setRoles（Set appUserRoles）{
this.appUserRoles=appUserRoles；
}
}
公共类AppUserRoleEntity实现AppUserRole{
私有用户角色；
私有appUser实体appUser；
public void setRole（用户角色）{
this.role=角色；
}

---

请检查并共享您的输入以解决此问题。我完全卡住了，无法进一步移动。

AppUserRoleResource

和

AppUserRoleEntity

不能在它们之间分配。
因此，您不能将一个

集合

分配给另一个

集合。

它们具有相同的基类，仅此而已：

public class AppUserRoleResource extends DefaultResource implements AppUserRole {...}

public class AppUserRoleEntity implements AppUserRole {...}

此外，即使可以将
AppUserRoleResource
对象分配给
AppUserRoleEntity
变量，如果不使用带上限的有界通配符作为超级类型的上限，您也无法对这些类型的泛型集合执行相同的操作，因为它的声明：
非常感谢uld请告诉我是否遵循了正确的设计或设计本身存在错误。我将尝试在图片中显示映射器库，以确保您受到欢迎。设计是正确的。您偶然发现此类问题，因为您使用不同的类来表示不同逻辑层的相同内容。这是一种有效的方法，但您让其他人认为不需要使用此抽象。