List타입의 값을 받아서 HTML로 보여줄 때 오류

Question

package com.example.seedstarter.controller; import com.example.seedstarter.entity.Feature; import com.example.seedstarter.entity.FeatureType; import com.example.seedstarter.entity.SeedStarter; import com.example.seedstarter.entity.SeedStarterAddForm; import com.example.seedstarter.service.SeedStarterService; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import lombok.RequiredArgsConstructor; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import java.util.List; import java.util.stream.Collectors; @RequiredArgsConstructor @Controller public class SeedStarterMngController { private final SeedStarterService seedStarterService; private final ObjectMapper mapper; @ModelAttribute public void addAttribute(Model model){ model.addAttribute("seedStarterAddForm", new SeedStarterAddForm()); } @RequestMapping({"/", "/seedstartermng"}) public String showSeedstarters(Model model) throws JsonProcessingException { List seedStarterWithFeature = seedStarterService.findWithFeature(); List seedStarterWithDetail = seedStarterService.findWithDetail(); model.addAttribute("seedStarterWithFeature", seedStarterWithFeature); model.addAttribute("seedStarterWithDetail", seedStarterWithDetail); return "seedstartermng"; } @PostMapping("/seedstartermng") public String addSeedStarter(@ModelAttribute SeedStarterAddForm seedStarterAddForm, Model model){ SeedStarter seedStarter = toSeedStarter(seedStarterAddForm); seedStarterService.save(seedStarter); // 저장 메소드 호출 return "redirect:/"; } // SeedStarterAddForm 객체를 SeedStarter 객체로 변환하는 메소드 private SeedStarter toSeedStarter(SeedStarterAddForm seedStarterAddForm){ SeedStarter seedStarter = new SeedStarter(); seedStarter.setDatePlanted(seedStarterAddForm.getDatePlanted()); seedStarter.setCovered(seedStarterAddForm.isCovered()); seedStarter.setType(seedStarterAddForm.getType()); seedStarter.setFeatures(seedStarterAddForm.getFeatures()); return seedStarter; } }package com.example.seedstarter.entity; import lombok.Getter; import lombok.Setter; import java.time.LocalDateTime; import java.util.List; @Getter @Setter public class SeedStarterAddForm { private LocalDateTime datePlanted; private boolean covered; private Type type; private List features; // private String substrate; private String fertilizer; private String phCorrector; private String variety; // 품종 }

seed_starter_id 2024-04-05T14:50:57.032+09:00 WARN 1164 --- [nio-8080-exec-5] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public java.lang.String com.example.seedstarter.controller.SeedStarterMngController.addSeedStarter(com.example.seedstarter.entity.SeedStarterAddForm,org.springframework.ui.Model): [Field error in object 'seedStarterAddForm' on field 'features': rejected value [FERTILIZER]; codes [typeMismatch.seedStarterAddForm.features,typeMismatch.features,typeMismatch.java.util.List,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [seedStarterAddForm.features,features]; arguments []; default message [features]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.List' for property 'features'; Cannot convert value of type 'java.lang.String' to required type 'com.example.seedstarter.entity.Feature' for property 'features[0]': no matching editors or conversion strategy found]] ] 이 부분을 구현중인데 심은 날짜, 가림 유무, 소재는 반환값이 1개여서 바로 들어오는데 특징이나 셀별품종은 여러개라서 List로 구현했는데 어떻게 Data를 받아와야할지 모르겠어요 ..ㅠㅠ사진처럼 seedStarter.setFeatures(seedStarterAddForm.getFeatures()); 똑같이 사용하면 아래와 같은 에러로그가 뜨면서 400 http상태코드가 발생하더라구요 ..List타입은 어떻게 받아와서 화면에 뿌려야하나요??제가 개발언어만 보다가 작게나마 CRUD 게시판 만들어보고 싶어서 혼자 진행하고 있어서 모르는 점이 많은점 이해 부탁드려요 😭2024-04-05T14:50:57.032+09:00 WARN 1164 --- [nio-8080-exec-5] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public java.lang.String com.example.seedstarter.controller.SeedStarterMngController.addSeedStarter(com.example.seedstarter.entity.SeedStarterAddForm,org.springframework.ui.Model): [Field error in object 'seedStarterAddForm' on field 'features': rejected value [FERTILIZER]; codes [typeMismatch.seedStarterAddForm.features,typeMismatch.features,typeMismatch.java.util.List,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [seedStarterAddForm.features,features]; arguments []; default message [features]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.List' for property 'features'; Cannot convert value of type 'java.lang.String' to required type 'com.example.seedstarter.entity.Feature' for property 'features[0]': no matching editors or conversion strategy found]] ]

개발잡부 · Answer

LIST를 무지성으로 출력하면안되고,th:each같은걸 사용해서, list를 순회하면서각 값에 대하여 span태그를 만들어서 이어주던가,애초에 백엔드에서 내려줄때 String으로 바꿔서 내려주던가 해야죠

List타입의 값을 받아서 HTML로 보여줄 때 오류

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