src/main/java/com/kamco/cd/kamcoback/common/utils/NetUtils.java

@@ -5,11 +5,9 @@ import java.net.InetAddress;
 import java.net.URLEncoder;
 import java.net.UnknownHostException;
 import java.nio.charset.StandardCharsets;
-import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 import org.springframework.http.HttpHeaders;
-import org.springframework.http.MediaType;
 
 public class NetUtils {
 
@@ -56,9 +54,8 @@ public class NetUtils {
 
   public HttpHeaders jsonHeaders() {
     HttpHeaders headers = new HttpHeaders();
-    headers.setContentType(MediaType.APPLICATION_JSON);
+    headers.set(HttpHeaders.ACCEPT, "application/json;charset=UTF-8");
-    headers.setAccept(List.of(MediaType.APPLICATION_JSON));
+    headers.set(HttpHeaders.CONTENT_TYPE, "application/json;charset=UTF-8");
-
     return headers;
   }
 }

src/main/java/com/kamco/cd/kamcoback/config/resttemplate/RestTemplateConfig.java

@@ -1,11 +1,13 @@
 package com.kamco.cd.kamcoback.config.resttemplate;
 
+import java.nio.charset.StandardCharsets;
 import lombok.extern.log4j.Log4j2;
 import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.client.BufferingClientHttpRequestFactory;
 import org.springframework.http.client.SimpleClientHttpRequestFactory;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.web.client.RestTemplate;
 
 @Log4j2
@@ -18,8 +20,12 @@ public class RestTemplateConfig {
     baseFactory.setConnectTimeout(2000);
     baseFactory.setReadTimeout(3000);
 
+    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
+    jsonConverter.setDefaultCharset(StandardCharsets.UTF_8);
+
     return builder
         .requestFactory(() -> new BufferingClientHttpRequestFactory(baseFactory))
+        .messageConverters(jsonConverter)
         .additionalInterceptors(new RetryInterceptor())
         .build();
   }

src/main/java/com/kamco/cd/kamcoback/config/resttemplate/RetryInterceptor.java

@@ -1,12 +1,15 @@
 package com.kamco.cd.kamcoback.config.resttemplate;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.concurrent.TimeUnit;
+import lombok.extern.log4j.Log4j2;
 import org.springframework.http.HttpRequest;
 import org.springframework.http.client.ClientHttpRequestExecution;
 import org.springframework.http.client.ClientHttpRequestInterceptor;
 import org.springframework.http.client.ClientHttpResponse;
 
+@Log4j2
 public class RetryInterceptor implements ClientHttpRequestInterceptor {
 
   private static final int MAX_RETRY = 3;
@@ -20,21 +23,25 @@ public class RetryInterceptor implements ClientHttpRequestInterceptor {
 
     for (int attempt = 1; attempt <= MAX_RETRY; attempt++) {
       try {
-        // HTTP 응답을 받으면(2xx/4xx/5xx 포함) 그대로 반환
+        log.info("[WIRE-REQ] {} {}", request.getMethod(), request.getURI());
-        return execution.execute(request, body);
+        log.info("[WIRE-REQ-HEADERS] {}", request.getHeaders());
+        log.info("[WIRE-REQ-BODY] {}", new String(body, StandardCharsets.UTF_8));
+
+        ClientHttpResponse response = execution.execute(request, body);
+
+        log.info("[WIRE-RES-STATUS] {}", response.getStatusCode());
+        return response;
 
       } catch (IOException e) {
-        // 네트워크/타임아웃 등 I/O 예외만 재시도
         lastException = e;
+        log.error("[WIRE-IO-ERR] attempt={} msg={}", attempt, e.getMessage(), e);
       }
 
-      // 마지막 시도가 아니면 대기
       if (attempt < MAX_RETRY) {
         sleep();
       }
     }
 
-    //  마지막 예외를 그대로 던져서 원인이 로그에 남게 함
     throw lastException;
   }
 

src/main/java/com/kamco/cd/kamcoback/postgres/core/InferenceResultCoreService.java

@@ -37,10 +37,12 @@ import jakarta.persistence.EntityNotFoundException;
 import jakarta.validation.constraints.NotNull;
 import java.time.ZonedDateTime;
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Objects;
 import java.util.UUID;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.log4j.Log4j2;
@@ -81,23 +83,28 @@ public class InferenceResultCoreService {
    * @param req
    */
   public UUID saveInferenceInfo(InferenceResultDto.RegReq req, List<MngListDto> targetList) {
-    String firstMapSheetName = null;
+    List<MngListDto> distinctList =
-    String mapSheetName = "";
+        targetList.stream()
-    int detectingCnt = 0;
+            .filter(dto -> dto.getMapSheetName() != null && !dto.getMapSheetName().isBlank())
+            .collect(
+                Collectors.toMap(
+                    MngListDto::getMapSheetName,
+                    dto -> dto,
+                    (existing, duplicate) -> existing,
+                    LinkedHashMap::new))
+            .values()
+            .stream()
+            .toList();
 
-    for (MngListDto dto : targetList) {
+    int detectingCnt = distinctList.size();
-      if (detectingCnt == 0) {
-        firstMapSheetName = dto.getMapSheetName();
-      }
-      detectingCnt++;
-    }
 
+    String mapSheetName;
     if (detectingCnt == 0) {
       mapSheetName = "";
     } else if (detectingCnt == 1) {
-      mapSheetName = firstMapSheetName + " 1건";
+      mapSheetName = distinctList.get(0).getMapSheetName() + " 1건";
     } else {
-      mapSheetName = firstMapSheetName + " 외 " + (detectingCnt - 1) + "건";
+      mapSheetName = distinctList.get(0).getMapSheetName() + " 외 " + (detectingCnt - 1) + "건";
     }
 
     MapSheetLearnEntity mapSheetLearnEntity = new MapSheetLearnEntity();