[Developer] #424 show DB setup errors

Refs #424

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

@@ -3,6 +3,8 @@ package com.cloudhandson.vpdbackoffice.web;
 import com.cloudhandson.vpdbackoffice.service.BearerTokenService;
 import com.cloudhandson.vpdbackoffice.service.PermissionService;
 import com.cloudhandson.vpdbackoffice.service.ProtectedObjectService;
+import java.util.List;
+import org.springframework.dao.DataAccessException;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -26,9 +28,23 @@ public class DashboardController {
 
   @GetMapping("/")
   public String dashboard(Model model) {
-    model.addAttribute("objects", protectedObjectService.findEnabled());
-    model.addAttribute("roles", permissionService.findRoles());
-    model.addAttribute("tokens", bearerTokenService.findAll());
+    try {
+      model.addAttribute("objects", protectedObjectService.findEnabled());
+      model.addAttribute("roles", permissionService.findRoles());
+      model.addAttribute("tokens", bearerTokenService.findAll());
+    } catch (DataAccessException e) {
+      model.addAttribute("objects", List.of());
+      model.addAttribute("roles", List.of());
+      model.addAttribute("tokens", List.of());
+      model.addAttribute("setupError", dbSetupMessage(e));
+    }
     return "dashboard";
   }
+
+  private String dbSetupMessage(DataAccessException e) {
+    String detail = e.getMostSpecificCause() == null ? e.getMessage() : e.getMostSpecificCause().getMessage();
+    return "ADB 연결을 확인할 수 없습니다. BACKOFFICE_DB_URL, BACKOFFICE_DB_USERNAME, "
+        + "BACKOFFICE_DB_PASSWORD를 설정하고 ./run.sh backoffice-support를 먼저 실행하세요. 상세: "
+        + detail;
+  }
 }