src/main/java/ru/ulstu/conference/controller/ConferenceController.java

@@ -74,18 +74,9 @@ public class ConferenceController {
 
     @PostMapping(value = "/conference", params = "save")
     public String save(@Valid ConferenceDto conferenceDto, Errors errors) throws IOException {
-        conferenceService.filterEmptyDeadlines(conferenceDto);
+        if (!conferenceService.save(conferenceDto, errors)) {
-        conferenceService.checkEmptyFieldsOfDeadline(conferenceDto, errors);
-        conferenceDto.setName(conferenceDto.getTitle());
-        conferenceService.checkUniqueName(conferenceDto,
-                errors,
-                conferenceDto.getId(),
-                "title",
-                "Конференция с таким именем уже существует");
-        if (errors.hasErrors()) {
             return CONFERENCE_PAGE;
         }
-        conferenceService.save(conferenceDto);
         return String.format(REDIRECT_TO, CONFERENCES_PAGE);
     }
 

src/main/java/ru/ulstu/conference/service/ConferenceService.java

@@ -91,12 +91,26 @@ public class ConferenceService extends BaseService {
         return new ConferenceDto(conferenceRepository.findOne(id));
     }
 
-    public void save(ConferenceDto conferenceDto) throws IOException {
+    public boolean save(ConferenceDto conferenceDto, Errors errors) throws IOException {
+        conferenceDto.setName(conferenceDto.getTitle());
+        filterEmptyDeadlines(conferenceDto);
+        checkEmptyFieldsOfDeadline(conferenceDto, errors);
+        checkUniqueName(conferenceDto,
+                errors,
+                conferenceDto.getId(),
+                "title",
+                "Конференция с таким именем уже существует");
+        if (errors.hasErrors()) {
+            return false;
+        }
+
         if (isEmpty(conferenceDto.getId())) {
             create(conferenceDto);
         } else {
             update(conferenceDto);
         }
+
+        return true;
     }
 
     @Transactional

src/main/resources/templates/conferences/conference.html

@@ -30,11 +30,12 @@
                                     <label for="title">Название:</label>
                                     <input class="form-control" th:field="*{title}" id="title" type="text"
                                            placeholder="Название конференции"/>
-                                    <p th:if="${#fields.hasErrors('title')}" th:errors="*{title}"
-                                       class="alert alert-danger">Incorrect title</p>
-                                    <p class="help-block text-danger"></p>
                                 </div>
 
+                                <p th:if="${#fields.hasErrors('title')}" th:errors="*{title}"
+                                   class="alert alert-danger">Incorrect title</p>
+                                <p class="help-block text-danger"></p>
+
                                 <div class="form-group">
                                     <label for="url">URL:</label>
                                     <input class="form-control" th:field="*{url}" id="url" type="text"