fix display paper title

src/main/java/ru/ulstu/paper/model/PaperDto.java

@@ -2,6 +2,7 @@ package ru.ulstu.paper.model;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import org.apache.commons.lang3.StringUtils;
 import org.hibernate.validator.constraints.NotEmpty;
 import ru.ulstu.deadline.model.DeadlineDto;
 import ru.ulstu.user.model.UserDto;
@@ -16,9 +17,11 @@ import java.util.stream.Collectors;
 import static ru.ulstu.core.util.StreamApiUtils.convert;
 
 public class PaperDto {
+    private final static int MAX_AUTHORS_LENGTH = 60;
+
     private Integer id;
     @NotEmpty
-    @Size(min = 3, max = 100)
+    @Size(min = 3, max = 254)
     private String title;
     private Paper.PaperStatus status;
     private Date createDate;
@@ -196,10 +199,10 @@ public class PaperDto {
     }
 
     public String getAuthorsString() {
-        return authors
+        return StringUtils.abbreviate(authors
                 .stream()
                 .map(author -> author.getLastName())
-                .collect(Collectors.joining(", "));
+                .collect(Collectors.joining(", ")), MAX_AUTHORS_LENGTH);
     }
 
     public Integer getFilterAuthorId() {

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

@@ -1,5 +1,6 @@
 package ru.ulstu.paper.service;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.deadline.model.Deadline;
@@ -28,6 +29,8 @@ import static ru.ulstu.paper.model.Paper.PaperStatus.ON_PREPARATION;
 
 @Service
 public class PaperService {
+    private final static int MAX_DISPLAY_SIZE = 40;
+
     private final PaperNotificationService paperNotificationService;
     private final PaperRepository paperRepository;
     private final UserService userService;
@@ -51,7 +54,9 @@ public class PaperService {
     }
 
     public List<PaperDto> findAllDto() {
-        return convert(findAll(), PaperDto::new);
+        List<PaperDto> papers = convert(findAll(), PaperDto::new);
+        papers.forEach(paperDto -> paperDto.setTitle(StringUtils.abbreviate(paperDto.getTitle(), MAX_DISPLAY_SIZE)));
+        return papers;
     }
 
     public PaperDto findOneDto(Integer id) {