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У меня есть эта ошибка:

 /Users/mj/Documents/Deploy/Heroku/Gym/src/main/java/app/gym/v1/Model/Domain/Gym.java:51:40 java: incompatible types: cannot infer type arguments for java.util.ArrayListlt;gt;  reason: no instance(s) of type variable(s) E exist so that java.util.ArrayListlt;Egt; conforms to java.util.Setlt;app.gym.v1.Model.Domain.Sportgt;  

Я не знаю, почему или что не так, я проверяю все дважды каждую строку кода, но чего-то не хватает.

это модель:

 package app.gym.v1.Model.Domain;  import app.gym.v1.Model.User; import com.fasterxml.jackson.annotation.JsonProperty; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor;  import javax.persistence.*; import java.io.Serializable; import java.util.ArrayList; import java.util.Set;  @Entity @Table(name = "gyms") @NoArgsConstructor @AllArgsConstructor @Data public class Gym implements Serializable {   @Id  @GeneratedValue(strategy = GenerationType.AUTO)  @Column(nullable = false, updatable = false)  @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)  private Long id;   @OneToOne(cascade = CascadeType.ALL)  @JoinColumn(name = "user_id", referencedColumnName = "id")  private User user;   @Column(name = "gym_name")  private String gymName;   @Column(name = "gym_phone")  private String gymPhone;   @Column(name = "gym_address")  private String gymAddress;   @Column(name = "logo", columnDefinition="LONGTEXT")  private String logo;   @OneToMany(mappedBy="gym")  private Setlt;Productgt; products;   @OneToMany(mappedBy="gym")  private Setlt;Sportgt; sports;   public void addSportForGym(Sport sport) {  if(getSports()==null) {  this.sports = new ArrayListlt;gt;();  }  getSports().add(sport);  sport.setGym(this);  } }   

это реализация сервиса:

 package app.gym.v1.Utility.Impl;  import app.gym.v1.DAO.SportRepo; import app.gym.v1.Model.Domain.Gym; import app.gym.v1.Model.Domain.Sport; import app.gym.v1.Service.SportService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;  import javax.transaction.Transactional; import java.util.List;  @Service @Transactional public class SportServiceImpl implements SportService {   private SportRepo sportRepo;   @Autowired  public SportServiceImpl(SportRepo sportRepo) {  this.sportRepo = sportRepo;  }   @Override  public Sport findSportById(Long id) {  return null;  }   @Override  public Listlt;Sportgt; findSportForPlayer(Long idPlayer) {  return null;  }   @Override  public Listlt;Sportgt; findSportForCaptain(Long idCaptain) {  return null;  }   @Override  public Listlt;Sportgt; findSportForGym(Long idGym) {  return null;  }   @Override  public Sport addSportForGym(Sport sport, Gym gym) {  gym.addSportForGym(sport);  return sportRepo.save(sport);  }   @Override  public void addSportForPlayer(Long idSport, Long idPlayer) {   }   @Override  public Sport editSport(Sport sport, Sport existSport) {  existSport.setSpName(sport.getSpName());  existSport.setDescription(sport.getDescription());  existSport.setSpLogo(sport.getSpLogo());  return sportRepo.save(existSport);  }   @Override  public void deleteSport(Long id) {  Sport existsSport = sportRepo.findById(id).orElse(null);  sportRepo.delete(existsSport);  } }   

this is the service:

 package app.gym.v1.Service;  import app.gym.v1.Model.Domain.Gym; import app.gym.v1.Model.Domain.Sport; import org.springframework.stereotype.Service;  import java.util.List;  @Service public interface SportService {    Sport findSportById(Long id);  Listlt;Sportgt; findSportForPlayer(Long idPlayer);  Listlt;Sportgt; findSportForCaptain(Long idCaptain);  Listlt;Sportgt; findSportForGym(Long idGym);   Sport addSportForGym(Sport sport, Gym gym);  void addSportForPlayer(Long idSport, Long idPlayer);  Sport editSport(Sport sport, Sport existSport);   void deleteSport(Long id); }   

и это контроль:

 package app.gym.v1.Resource.API;  import app.gym.v1.Model.Domain.Gym; import app.gym.v1.Model.Domain.Sport; import app.gym.v1.Service.SportService; import app.gym.v1.Utility.Constant.SwaggerConstant; import io.swagger.annotations.Api; import io.swagger.annotations.ApiOperation; import io.swagger.v3.oas.annotations.responses.ApiResponse; import io.swagger.v3.oas.annotations.responses.ApiResponses; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*;  import java.util.List;  @RestController @RequestMapping(path = "/sport") @Api(tags = {SwaggerConstant.API_TAG8}) @CrossOrigin(origins = "*") public class SportControl {   @Autowired  private SportService sportService;   @ApiOperation(value = "Finding Sports with id in the gym", notes = "Looking for sport gym with id", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Looking for specific sport's type in gym with id"),  @ApiResponse(responseCode = "500", description = "Successfully register new user"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @GetMapping("/find_sp_by_Id/{id}")  Sport findSportById(@PathVariable Long id) {  return sportService.findSportById(id);  }   @ApiOperation(value = "Looking for player in the gym", notes = "Looking for player", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Looking for specific sport's player in gym"),  @ApiResponse(responseCode = "500", description = "Successfully player was founded"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @GetMapping("/find_sp_for_player/{idPlayer}")  Listlt;Sportgt; findSportForPlayer(@PathVariable Long idPlayer) {  return sportService.findSportForPlayer(idPlayer);  }   @ApiOperation(value = "Finding Sport in the gym", notes = "Looking for sport gym", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Looking for specific sport's type in gym"),  @ApiResponse(responseCode = "500", description = "Successfully sport founded"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @GetMapping("/find_sp_in_gym/{idGym}")  Listlt;Sportgt; findSportForGym(@PathVariable Long idGym) {  return sportService.findSportForGym(idGym);  }   @ApiOperation(value = "Adding sport to the gym", notes = "Adding new sport type to the gym", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Adding sport type to the gym"),  @ApiResponse(responseCode = "500", description = "Successfully sports added to the gym"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @PostMapping("/add_sp_gym/{idGym}")  Sport addSportForGym(@RequestBody Sport sport, @RequestBody Gym gym) {  return sportService.addSportForGym(sport, gym);  }   @ApiOperation(value = "Adding Sport for the player", notes = "Adding player to the sport", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Adding player to the sport"),  @ApiResponse(responseCode = "500", description = "Successfully player added"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @PostMapping("/add_to_plauer/{sport_id}/{player_id}")  void addSportForPlayer(@PathVariable Long idSport, @PathVariable Long idPlayer) {  sportService.addSportForPlayer(idSport, idPlayer);  }   @ApiOperation(value = "Editing Sport in the gym", notes = "Editing sport in the gym", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Editing sport in the gym"),  @ApiResponse(responseCode = "500", description = "Successfully Editing sport course"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @PutMapping("/edit_sp/{id}")  Sport editSport(@RequestBody Sport sport, @RequestBody Sport existSport) {  return sportService.editSport(sport, existSport);  }   @ApiOperation(value = "Deleting Sport in the gym", notes = "Deleting sport in the gym", response = Sport.class)  @ApiResponses({@ApiResponse(responseCode = "200", description = "Deleting sport in the gym"),  @ApiResponse(responseCode = "500", description = "Successfully Deleted sport course"),  @ApiResponse(responseCode = "400", description = "The request is malformed or invalid"),  @ApiResponse(responseCode = "404", description = "The resource URL was not found on the server"),  @ApiResponse(responseCode = "403", description = "You are not authorized. Please authenticate and try again"),  @ApiResponse(responseCode = "401", description = "You don't have permission to this resource")  })  @DeleteMapping("/del_sp/{id}")  void deleteSport(@PathVariable Long id) {  sportService.deleteSport(id);  } }   

проблема с addSportForGym все проблемы здесь не такие, как в моем коде. Это все время говорит мне, что нет никакого примера