src/main/java/com/kamco/cd/kamcoback/gukyuin/dto/ChngDetectMastDto.java

@@ -216,4 +216,16 @@ public class ChngDetectMastDto {
     private ZonedDateTime reviewerWorkDttm;
     private ZonedDateTime labelSendDttm;
   }
+
+  @Getter
+  @Setter
+  @NoArgsConstructor
+  @AllArgsConstructor
+  public static class ErrorResDto {
+
+    private String timestamp;
+    private Integer status;
+    private String error;
+    private String path;
+  }
 }

src/main/java/com/kamco/cd/kamcoback/gukyuin/service/GukYuinApiService.java

@@ -1,5 +1,7 @@
 package com.kamco.cd.kamcoback.gukyuin.service;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.kamco.cd.kamcoback.common.utils.NetUtils;
 import com.kamco.cd.kamcoback.common.utils.UserUtil;
 import com.kamco.cd.kamcoback.config.api.ApiLogFunction;
@@ -13,6 +15,7 @@ import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectContDto.ResultContDto;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectContDto.ResultPnuDto;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto.ChnDetectMastReqDto;
+import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto.ErrorResDto;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto.LabelSendDto;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto.ResReturn;
 import com.kamco.cd.kamcoback.gukyuin.dto.ChngDetectMastDto.ResultDto;
@@ -51,6 +54,7 @@ public class GukYuinApiService {
 
   private final UserUtil userUtil;
   private final AuditLogRepository auditLogRepository;
+  private final ObjectMapper objectMapper;
 
   @Value("${spring.profiles.active:local}")
   private String profile;
@@ -80,15 +84,30 @@ public class GukYuinApiService {
             ChngDetectMastDto.RegistResDto.class);
 
     ChngDetectMastDto.RegistResDto resultBody = result.body();
-    Boolean success = false;
+    boolean success = false;
-    if (resultBody != null) {
+    if (resultBody != null && resultBody.getSuccess() != null) {
       ChngDetectMastDto.Basic registRes = resultBody.getResult();
+
+      success = resultBody.getSuccess();
       // 추론 회차에 applyStatus, applyStatusDttm 업데이트
       gukyuinCoreService.updateGukYuinMastRegResult(registRes);
 
       // anal_inference 에도 국유인 반영여부, applyDttm 업데이트
       gukyuinCoreService.updateAnalInferenceApplyDttm(registRes);
-      success = resultBody.getSuccess();
+    } else {
+      String errBody = result.errBody();
+      ErrorResDto error = null;
+      try {
+        error = objectMapper.readValue(errBody, ErrorResDto.class);
+        return new ChngDetectMastDto.RegistResDto(error.getStatus(), error.getError(), null, false);
+      } catch (JsonProcessingException e) {
+        log.error("에러 응답 파싱 실패. rawBody={}", errBody, e);
+        return new ChngDetectMastDto.RegistResDto(
+            result.statusCode(), // HTTP status
+            errBody, // 원문 그대로
+            null,
+            false);
+      }
     }
 
     this.insertGukyuinAuditLog(
@@ -98,6 +117,7 @@ public class GukYuinApiService {
         url.replace(gukyuinUrl, ""),
         chnDetectMastReq,
         success);
+
     return resultBody;
   }
 
@@ -398,9 +418,12 @@ public class GukYuinApiService {
     }
 
     // 국유인 /chn/mast/regist 전송
-    this.regist(reqDto);
+    ChngDetectMastDto.RegistResDto result = this.regist(reqDto);
-
+    if (result.getSuccess()) {
-    return new ResponseObj(ApiResponseCode.OK, "");
+      return new ResponseObj(ApiResponseCode.OK, "연동되었습니다.");
+    } else {
+      return new ResponseObj(ApiResponseCode.INTERNAL_SERVER_ERROR, result.getMessage());
+    }
   }
 
   public List<LabelSendDto> findLabelingCompleteSendList(LocalDate yesterday) {

src/main/java/com/kamco/cd/kamcoback/postgres/repository/gukyuin/GukYuinRepositoryImpl.java

@@ -164,7 +164,7 @@ public class GukYuinRepositoryImpl implements GukYuinRepositoryCustom {
         Expressions.numberTemplate(Integer.class, "coalesce({0}, 0)", mapSheetLearnEntity.stage);
 
     return queryFactory
-        .select(stageExpr.max())
+        .select(stageExpr.max().coalesce(0))
         .from(mapSheetLearnEntity)
         .where(
             mapSheetLearnEntity.compareYyyy.eq(compareYyyy),