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

@@ -22,7 +22,6 @@ import static org.springframework.util.StringUtils.isEmpty;
 import static ru.ulstu.core.controller.Navigation.CONFERENCES_PAGE;
 import static ru.ulstu.core.controller.Navigation.CONFERENCE_PAGE;
 import static ru.ulstu.core.controller.Navigation.REDIRECT_TO;
-import static ru.ulstu.core.controller.Navigation.hasErrors;
 
 
 @Controller()
@@ -56,7 +55,8 @@ public class ConferenceController {
         if (conferenceDto.getDeadlines().isEmpty()) {
             errors.rejectValue("deadlines", "errorCode", "Не может быть пустым");
         }
-        hasErrors(errors, CONFERENCE_PAGE);
+        if (errors.hasErrors())
+            return CONFERENCE_PAGE;
         conferenceService.save(conferenceDto);
         return String.format(REDIRECT_TO, CONFERENCES_PAGE);
 
@@ -65,7 +65,8 @@ public class ConferenceController {
     @PostMapping(value = "/conference", params = "addDeadline")
     public String addDeadline(@Valid ConferenceDto conferenceDto, Errors errors) {
         filterEmptyDeadlines(conferenceDto);
-        hasErrors(errors, CONFERENCE_PAGE);
+        if (errors.hasErrors())
+            return CONFERENCE_PAGE;
         conferenceDto.getDeadlines().add(new Deadline());
         return CONFERENCE_PAGE;
     }

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

@@ -30,6 +30,9 @@
                                     <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>
 
                                 <div class="form-group">
@@ -61,11 +64,12 @@
                                                 $('#deadlines${rowStat.index}\\.date').val('');
                                                 $('#addDeadline').click();|"/>
                                         </div>
-
                                     </div>
                                 </div>
                                 <p th:if="${#fields.hasErrors('deadlines')}" th:errors="*{deadlines}"
                                    class="alert alert-danger">Incorrect title</p>
+                                <p class="help-block text-danger"></p>
+
 
                                 <div class="form-group d-flex justify-content-end">
                                     <input type="submit" id="addDeadline" name="addDeadline"