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

@@ -86,7 +86,7 @@ public class ConferenceController {
     }
 
     @PostMapping(value = "/conference", params = "addDeadline")
-    public String addDeadline(@Valid ConferenceDto conferenceDto, Errors errors) {
+    public String addDeadline(@Valid ConferenceDto conferenceDto, Errors errors) throws IOException {
         filterEmptyDeadlines(conferenceDto);
         if (errors.hasErrors()) {
             return CONFERENCE_PAGE;
@@ -95,16 +95,6 @@ public class ConferenceController {
         return CONFERENCE_PAGE;
     }
 
-    @PostMapping(value = "/conference", params = "addPaper")
-    public String addPaper(@Valid ConferenceDto conferenceDto, Errors errors) {
-        if (errors.hasErrors()) {
-            return CONFERENCE_PAGE;
-        }
-        conferenceService.addPaper(conferenceDto);
-
-        return CONFERENCE_PAGE;
-    }
-
     @PostMapping(value = "/conference", params = "removeDeadline")
     public String removeDeadline(@Valid ConferenceDto conferenceDto, Errors errors,
                                  @RequestParam(value = "removeDeadline") Integer deadlineIndex) throws IOException {
@@ -115,6 +105,16 @@ public class ConferenceController {
         return CONFERENCE_PAGE;
     }
 
+    @PostMapping(value = "/conference", params = "addPaper")
+    public String addPaper(@Valid ConferenceDto conferenceDto, Errors errors) throws IOException {
+        if (errors.hasErrors()) {
+            return CONFERENCE_PAGE;
+        }
+        conferenceService.addPaper(conferenceDto);
+
+        return CONFERENCE_PAGE;
+    }
+
     @PostMapping(value = "/conference", params = "removePaper")
     public String removePaper(@Valid ConferenceDto conferenceDto, Errors errors,
                               @RequestParam(value = "removePaper") Integer paperIndex) throws IOException {

src/main/java/ru/ulstu/conference/model/Conference.java

@@ -53,7 +53,7 @@ public class Conference extends BaseEntity {
     @OrderBy("date")
     private List<Deadline> deadlines = new ArrayList<>();
 
-    @ManyToMany(fetch = FetchType.EAGER)
+    @ManyToMany(cascade = CascadeType.MERGE, fetch = FetchType.EAGER)
     @JoinTable(name = "paper_conference",
             joinColumns = {@JoinColumn(name = "conference_id")},
             inverseJoinColumns = {@JoinColumn(name = "paper_id")})

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

@@ -111,9 +111,19 @@ public class ConferenceService {
         conferenceDto.getDeadlines().remove((int) deadlineIndex);
     }
 
+    public void addPaper(ConferenceDto conferenceDto) {
+        Paper paper = new Paper();
+        paper.setTitle(userService.getCurrentUser().getLastName() + "_" + conferenceDto.getTitle());
+        paper.setStatus(Paper.PaperStatus.DRAFT);
+
+        conferenceDto.getPapers().add(paper);
+    }
+
     public void removePaper(ConferenceDto conferenceDto, Integer paperIndex) throws IOException {
         Paper removedPaper = conferenceDto.getPapers().remove((int) paperIndex);
-        conferenceDto.getNotSelectedPapers().add(removedPaper);
+        if (removedPaper.getId() != null) {
+            conferenceDto.getNotSelectedPapers().add(removedPaper);
+        }
     }
 
     public void takePart(ConferenceDto conferenceDto) throws IOException {
@@ -144,7 +154,8 @@ public class ConferenceService {
         conference.setPing(0);
         conference.setBeginDate(conferenceDto.getBeginDate());
         conference.setEndDate(conferenceDto.getEndDate());
-        conference.setPapers(conferenceDto.getPapers());
+        conference.getPapers().clear();
+        conferenceDto.getPapers().forEach(paper -> conference.getPapers().add(paper.getId() != null ? paperService.findPaperById(paper.getId()) : paperService.create(paper)));
         conference.setDeadlines(deadlineService.saveOrCreate(conferenceDto.getDeadlines()));
         conference.setUsers(conferenceUserService.saveOrCreate(conferenceDto.getUsers()));
         if (conferenceDto.getPaperIds() != null && !conferenceDto.getPaperIds().isEmpty()) {
@@ -173,10 +184,4 @@ public class ConferenceService {
     public List<Conference> findAllActive() {
         return conferenceRepository.findAllActive(new Date());
     }
-
-    public void addPaper(ConferenceDto conferenceDto) {
-        Paper paper = new Paper();
-        paper.setTitle(userService.getCurrentUser().getLastName() + "_" + conferenceDto.getTitle());
-        conferenceDto.getPapers().add(paper);
-    }
 }

src/main/java/ru/ulstu/paper/service/PaperService.java

@@ -93,6 +93,14 @@ public class PaperService {
         return newPaper.getId();
     }
 
+    @Transactional
+    public Paper create(Paper paper) {
+        Paper newPaper = paperRepository.save(paper);
+        paperNotificationService.sendCreateNotification(newPaper);
+        eventService.createFromPaper(newPaper);
+        return newPaper;
+    }
+
     private Paper copyFromDto(Paper paper, PaperDto paperDto) throws IOException {
         paper.setComment(paperDto.getComment());
         paper.setUrl(paperDto.getUrl());

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

@@ -131,9 +131,11 @@
                                 <div class="form-group">
                                     <label for="papers">Статьи:</label>
                                     <div class="paper-list form-control list-group" id="papers">
-                                        <input th:type="hidden" th:field="*{papers}"/>
+                                        <!--<input th:type="hidden" th:field="*{papers}"/>-->
                                         <div class="paper d-flex list-group-item p-0"
                                              th:each="paper, rowStat : *{papers}">
+                                            <input type="hidden" th:field="*{papers[__${rowStat.index}__].id}"/>
+                                            <input type="hidden" th:field="*{papers[__${rowStat.index}__].title}"/>
                                             <a class="paper-name"
                                                th:href="@{'/papers/paper?id=' + *{papers[__${rowStat.index}__].id} + ''}"
                                                th:if="*{papers[__${rowStat.index}__].id !=null}">