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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiM2I3MDgyYzI2Y2MzNDdjODkyZjg2ZGM4MmM0YjliOGMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13740?atlOrigin=eyJpIjoiM2I3MDgyYzI2Y2MzNDdjODkyZjg2ZGM4MmM0YjliOGMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-efc3df09-f6fc-4396-8c45-3871cf2a75f9" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13740?atlOrigin=eyJpIjoiM2I3MDgyYzI2Y2MzNDdjODkyZjg2ZGM4MmM0YjliOGMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13740</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-13740?atlOrigin=eyJpIjoiM2I3MDgyYzI2Y2MzNDdjODkyZjg2ZGM4MmM0YjliOGMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Problem with duplicates when fetching multiple many-to-many relations with Hibernate FetchMode.JOIN</a> </span> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="evgeniy.khist" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_evgeniy.khist" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A91620963-4f42-4dc7-a094-4b4322ea6762"> Evgeniy Khyst </a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">When there are multiple many-to-many relations with {{FetchMode.JOIN}}, {{session.find}} returns a result with a child relation of type {{List}} containing duplicates.<br><br>To avoid {{MultipleBagFetchException: cannot simultaneously fetch multiple bags}} when multiple {{@ManyToMany}} collections have {{@Fetch(FetchMode.JOIN)}}, only one collection has type {{List}} and others have type {{Set}}.<br><br>{code:java}@Entity<br>@Data<br>public class Book implements Serializable {<br><br> @Id<br> @GeneratedValue<br> private Long id;<br><br> private String isbn;<br><br> private String title;<br> <br> private LocalDate publicationDate;<br><br> @ManyToMany<br> @Fetch(FetchMode.JOIN)<br> private List<Author> authors = new ArrayList<>();<br><br> @ManyToMany<br> @Fetch(FetchMode.JOIN)<br> private Set<Category> categories = new LinkedHashSet<>();<br>}{code}<br><br>With the following test data<br><br>{code:java}softwareDevelopment = new Category("Software development");<br>session.save(softwareDevelopment);<br><br>systemDesign = new Category("System design");<br>session.save(systemDesign);<br><br>martinFowler = new Author("Martin Fowler");<br>session.save(martinFowler);<br><br>gregorHohpe = new Author("Gregor Hohpe");<br>session.save(gregorHohpe);<br><br>gregorHohpe = new Author();<br>gregorHohpe.setFullName("Gregor Hohpe");<br>session.save(gregorHohpe);<br><br>bobbyWoolf = new Author();<br>bobbyWoolf.setFullName("Bobby Woolf");<br>session.save(bobbyWoolf);<br><br>poeaa = new Book();<br>poeaa.setIsbn("007-6092019909");<br>poeaa.setTitle("Patterns of Enterprise Application Architecture");<br>poeaa.setPublicationDate(LocalDate.parse("2002-11-15"));<br>poeaa.getAuthors().addAll(List.of(martinFowler));<br>poeaa.getCategories().addAll(List.of(softwareDevelopment, systemDesign));<br>session.save(poeaa);<br><br>eip = new Book();<br>eip.setIsbn("978-0321200686");<br>eip.setTitle("Enterprise Integration Patterns");<br>eip.setPublicationDate(LocalDate.parse("2003-10-20"));<br>eip.getAuthors().addAll(List.of(gregorHohpe, bobbyWoolf));<br>eip.getCategories().addAll(List.of(softwareDevelopment, systemDesign));<br>session.save(eip);{code}<br><br>a Book entity found by ID contains duplicates in {{List<Author> authors}}<br><br>{code:java}@Test<br>void testFindByIdNoTrans() {<br> try (Session session = HibernateUtil.getSessionFactory().openSession()) {<br> Book poeaa = session.find(Book.class, this.poeaa.getId());<br> Book eip = session.find(Book.class, this.eip.getId());<br><br> assertThat(poeaa.getTitle()).isEqualTo(this.poeaa.getTitle());<br> assertThatHasAuthors(poeaa, martinFowler.getFullName());<br><br> assertThat(eip.getTitle()).isEqualTo(this.eip.getTitle());<br> assertThatHasAuthors(eip, gregorHohpe.getFullName(), bobbyWoolf.getFullName());<br> }<br>}{code}<br><br>{code:java}List<Author> authors = ["Martin Fowler", "Martin Fowler"]{code}<br><br>Probably, because {{categories}} has size 2: <br><br>{code:java}Set<Category> categories = ["Software development", "System design"]{code}<br><br>When there are 2 authors and 2 categories there are no duplicates in child relations.<br><br>Beginning transaction with {{session.beginTransaction()}} doesn't have any effect on the duplicates.<br><br>See the test [</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">com</span> <span class="diffaddedchars" style="background-color:#ddfade;">https://github</span> <span class="diffcontext">.</span> <span class="diffaddedchars" style="background-color:#ddfade;">com/evgeniy-khist/hibernate-fetch-mode-join/blob/master/src/test/java/com/</span> <span class="diffcontext">example</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">.</span> <span class="diffaddedchars" style="background-color:#ddfade;">/</span> <span class="diffcontext">hibernate</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">.</span> <span class="diffaddedchars" style="background-color:#ddfade;">/</span> <span class="diffcontext">BookFetchModeJoinWithSetTests</span> <span class="diffaddedchars" style="background-color:#ddfade;">.java</span> <span class="diffcontext">|https://github.com/evgeniy-khist/hibernate-fetch-mode-join/blob/master/src/test/java/com/example/hibernate/BookFetchModeJoinWithSetTests.java</span> <span class="diffaddedchars" style="background-color:#ddfade;">|smart-link</span> <span class="diffcontext">].<br><br>Using Spring Data JPA and making the test transactional with {{@org.springframework.transaction.annotation.Transactional}} solves the problem with duplicates. Spring Boot version - 2.2.1.RELEASE, Spring Data JPA version - 2.2.1.RELEASE, Hibernate version - 5.4.8.Final.<br><br>See the test [https://github.com/evgeniy-khist/</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">hibernate</span> <span class="diffaddedchars" style="background-color:#ddfade;">spring</span> <span class="diffcontext">-</span> <span class="diffaddedchars" style="background-color:#ddfade;">data-jpa-</span> <span class="diffcontext">fetch-mode-join/blob/master/src/test/java/com/example/</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">hibernate</span> <span class="diffaddedchars" style="background-color:#ddfade;">spring</span> <span class="diffcontext">/</span> <span class="diffaddedchars" style="background-color:#ddfade;">data/jpa/</span> <span class="diffcontext">BookFetchModeJoinWithSetTests.java|https://github.com/evgeniy-khist/</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">hibernate</span> <span class="diffaddedchars" style="background-color:#ddfade;">spring</span> <span class="diffcontext">-</span> <span class="diffaddedchars" style="background-color:#ddfade;">data-jpa-</span> <span class="diffcontext">fetch-mode-join/blob/master/src/test/java/com/example/</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">hibernate</span> <span class="diffaddedchars" style="background-color:#ddfade;">spring</span> <span class="diffcontext">/</span> <span class="diffaddedchars" style="background-color:#ddfade;">data/jpa/</span> <span class="diffcontext">BookFetchModeJoinWithSetTests.java|smart-link] .</span> </td>
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