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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10454" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-555cb8eb-2b6e-4e61-9c98-979c47368cba" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10454" style="color: #3b73af; text-decoration: none">HHH-10454</a> </td>
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<td style="vertical-align: top;; padding: 0px; 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-10454" style="color: #3b73af; text-decoration: none">session.persist fails for OneToOne relation with optional=false and generator is IDENTITY/AUTO</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">I have tested with Hibernate 5.0.4 and randomly with 4.3.11. The issue is reproducible in both these versions. I believe, we might be able to reproduce this issue with some other version as well. </p> </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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="Madhusudana Reddy Sunnapu" id="email_Madhusudana Reddy Sunnapu" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Madhusudana+Reddy+Sunnapu" style="color:#6c797f;; color: #3b73af; text-decoration: none">Madhusudana Reddy Sunnapu</a> </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">Affects Version/s:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffaddedchars" style="background-color:#ddfade;">4.3.11</span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">I have two entities Post and PostDetails that are mapped as OneToOne with shared primary key, optional=false and id generator strategy set as IDENTITY/AUTO. When I try to persist the Post entity it fails with throwing exception.<br><br>Assuming we have following entities Post and PostDetails mapped as OneToOne with shared primary key, optional=false and id generator strategy set as IDENTITY/AUTO as below<br><br>{code:java}<br>@Entity<br>public class Post implements Serializable {<br> @Id<br> @GeneratedValue(strategy = GenerationType.IDENTITY)<br> private long id;<br> @OneToOne(mappedBy="post", cascade = { CascadeType.ALL }, optional=false)<br> private PostDetails details;<br> public long getId() {<br> return id;<br> }<br> public PostDetails getDetails() {<br> return details;<br> }<br> public void addDetails(PostDetails details) {<br> this.details = details;<br> details.setPost(this);<br> }<br><br> public void deleteDetails() {<br> if(details !=null) {<br> details.setPost(null);<br> }<br> this.details = null;<br> }<br>}<br><br>@Entity<br>public class PostDetails implements Serializable {<br> @Id<br> @Column<br> private long id;<br> @OneToOne<br> @JoinColumn(name="id") <br> @MapsId <br> private Post post;<br> <br> public long getId() {<br> return id;<br> }<br> public Post getPost() {<br> return post;<br> }<br> public void setPost(Post post) {<br> this.post = post;<br> }<br>}<br><br>{code}<br><br>When we execute the following test case to save the entities,<br><br>{code:java}<br> @Test<br> public void persistPost() {<br> Session session = sf.getCurrentSession();<br> session.getTransaction().begin();<br> Post post = new Post();<br> PostDetails details = new PostDetails();<br> post.addDetails(details);<br> session.persist(post);<br> session.beginTransaction().commit();<br> }<br>{code}<br><br>It fails to save and throws the following exception:<br><br>{code:java}<br>org.hibernate.id.IdentifierGenerationException: null id generated for:class PostDetails<br>{code} for IDENTITY<br>and<br><br>{code:java}<br>org.hibernate.exception.ConstraintViolationException: could not execute statement <br>{code} for AUTO<br><br>The same code works with both IDENTITY/AUTO if we change it to optional=true as below.<br><br>{code:java}<br>Changing<br>@OneToOne(mappedBy="post", cascade = { CascadeType.ALL }, optional=false)<br>to<br>@OneToOne(mappedBy="post", cascade = { CascadeType.ALL }, optional=true)<br>{code}<br><br>Although I tested only with DerbyDB and h2, I believe, issue can be replicated on other databases as well.</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>The problem is without supporting optional=false is it would always result in EAGER loading OneToOne associations in a subsequent SELECT.</span> </td>
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