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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=eyJpIjoiODY4ODA3YTE3NDk4NGViYTg2MDQzNjIyNjAyZjM0M2QiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13815?atlOrigin=eyJpIjoiODY4ODA3YTE3NDk4NGViYTg2MDQzNjIyNjAyZjM0M2QiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-90672632-2fdf-4d9e-81e4-2225b83c64db" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13815?atlOrigin=eyJpIjoiODY4ODA3YTE3NDk4NGViYTg2MDQzNjIyNjAyZjM0M2QiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13815</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-13815?atlOrigin=eyJpIjoiODY4ODA3YTE3NDk4NGViYTg2MDQzNjIyNjAyZjM0M2QiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">org.hibernate.TransientObjectException when merging a bidirectional one-to-many relation</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Change By:</th>
<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="kelechul" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_kelechul" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A5ed87d36-6871-4732-a9ac-7d8eef9b51bf"> Lisandro Fernadez </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">Given a bidirectional one-to-many relation like the following:<br><br>{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffcontext">@Entity<br>public class Post {<br><br> @Id<br> private Long id;<br><br> private String title;<br><br> @OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)<br> private List<PostComment> comments = new ArrayList<>();<br><br> //Getters and setters are omitted for brevity<br>}<br><br>@Entity<br>public static class PostComment {<br><br> @Id<br> @GeneratedValue(strategy = GenerationType.IDENTITY)<br> private Long id;<br><br> private String review;<br><br> @ManyToOne(fetch = FetchType.LAZY)<br> @JoinColumn(name = "post_id")<br> private Post post;<br><br> //Getters and setters are omitted for brevity<br>}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffcontext">{code}<br><br>The next code throws an exception caused by calling post.getComments().isEmpty() with a merge operation:<br><br>{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffcontext">Post post = entityManager.find(Post.class, 1L);<br>post.addComment(new PostComment(“This post rocks!”));<br>post.getComments().isEmpty(); // this causes an exception<br>entityManager.merge(post);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffcontext">{code}<br><br>A couple of things to mention:<br><br>* Although calling isEmpty() is useless here, it serves as a testing propose. Deleting this call avoids the exception.<br>* Retrieving the post along with its comments using a "LEFT JOIN FETCH" query not only avoids the exception but also is better in terms of performance.<br>* Calling entityManager.persist(post) instead of entityManager.merge(post) also avoids the exception. In fact, both calls are redundant since the post is being managed by the current running Persistence Context.<br><br>According to @vladmihalcea (see</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext"> https://github.com/vladmihalcea/high-performance-java-persistence/pull/51)</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https</span> <span class="diffcontext">:</span> <span class="diffaddedchars" style="background-color:#ddfade;">//github.com/vladmihalcea/high-performance-java-persistence/pull/51):]</span> <span class="diffcontext"><br><br>"It looks like the merge generates an extra copy of the transient entity which has an id of null as if it was loaded from the DB".</span> </td>
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