refs #703: log schema metadata lookup failures

src/main/java/com/cloudhandson/vpdbackoffice/web/SchemaMetadataController.java

@@ -3,6 +3,8 @@ package com.cloudhandson.vpdbackoffice.web;
 import com.cloudhandson.vpdbackoffice.service.AppException;
 import com.cloudhandson.vpdbackoffice.service.SchemaMetadataService;
 import org.springframework.dao.DataAccessException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -13,6 +15,8 @@ import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 @Controller
 public class SchemaMetadataController {
 
+  private static final Logger log = LoggerFactory.getLogger(SchemaMetadataController.class);
+
   private final SchemaMetadataService schemaMetadataService;
 
   public SchemaMetadataController(SchemaMetadataService schemaMetadataService) {
@@ -27,7 +31,8 @@ public class SchemaMetadataController {
     try {
       model.addAttribute("metadata", schemaMetadataService.find(selectedKey));
     } catch (AppException | DataAccessException exception) {
-      model.addAttribute("errorMessage", safeMessage(exception));
+      log.warn("Schema metadata lookup failed for table key={}", selectedKey, exception);
+      model.addAttribute("errorMessage", readMessage(exception));
     }
     return "schema-metadata";
   }
@@ -105,4 +110,10 @@ public class SchemaMetadataController {
         ? exception.getMessage()
         : "DB 메타데이터를 저장하지 못했습니다. 권한, 식별자, Oracle annotation 문법을 확인하세요.";
   }
+
+  private String readMessage(Exception exception) {
+    return exception instanceof AppException
+        ? exception.getMessage()
+        : "DB 메타데이터를 조회하지 못했습니다. SGMP_POC 조회 권한과 대상 테이블 상태를 확인하세요.";
+  }
 }