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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=eyJpIjoiNjQ3ZjQxMmIxNmZmNDgxNGIyNjNlMWJlZjgwZjczYjMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13228?atlOrigin=eyJpIjoiNjQ3ZjQxMmIxNmZmNDgxNGIyNjNlMWJlZjgwZjczYjMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-0f0706b0-3bf0-4ab9-8e1f-237c699aee14" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13228?atlOrigin=eyJpIjoiNjQ3ZjQxMmIxNmZmNDgxNGIyNjNlMWJlZjgwZjczYjMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13228</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-13228?atlOrigin=eyJpIjoiNjQ3ZjQxMmIxNmZmNDgxNGIyNjNlMWJlZjgwZjczYjMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">@OneToOne with @MapsId is unware of its parent id during em.merge(child)</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-0f0706b0-3bf0-4ab9-8e1f-237c699aee14" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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 Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.18 </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="mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Af5e8c0d3-3aae-4bb4-a4e1-25463d60d232"> Vlad Mihalcea </a> </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"> hibernate-core </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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 24/Jan/2019 02:12 AM </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"> Hibernate Version: 5.2.17 <br> java version "1.8.0_181" <br> Java(TM) SE Runtime Environment (build 1.8.0_181-b13) <br> Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode) <br> Windows 10 <br> Postgresql 10.4 </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"> hibernate </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-1c6ad5df-1758-40df-aafc-f06e83afec39" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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="pmverma.cs" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_pmverma.cs" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A7750f6fd-a8e4-440d-97fd-271b03d97529"> P. Mohan </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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Creating issue for discussion here at <a href="https://discourse.hibernate.org/t/hibernate-onetoone-with-mapsid-does-not-map-the-same-id-with-the-parent-entity/2093/9" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://discourse.hibernate.org/t/hibernate-onetoone-with-mapsid-does-not-map-the-same-id-with-the-parent-entity/2093/9 </a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Summary:<br> A child entity is mapped using @OneToOne with @MapsId to its parent entity.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For eg,</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">class </span>Parent {
}
<span class="code-keyword" style="color: #000091">class </span>Child {
@OneToOne
@MapsId
<span class="code-keyword" style="color: #000091">private</span> Parent parent;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The assumption is that child will refer to its correct parent in any case. However, following code will break this assumption.</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Parent p = <span class="code-keyword" style="color: #000091">new</span> Parent(); <span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">new</span> parent
</span>em.save(p);
em.flush();
Child c = em.find(Child.class, 1L); <span class="code-comment" style="color: #808080">// child already have its original parent during its creation time
</span>c.setParent(p); <span class="code-comment" style="color: #808080">// updating to <span class="code-keyword" style="color: #000091; color: #808080">new</span> parent
</span>Child result = em.merge(c);
result.getParent(); <span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">new</span> parent</span>
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This way it will continue to use new parent until the end of transaction.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@OneToOne with @MapsId should always resolves to correct association value.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Sample test cases which show the issue.<br> <a href="https://github.com/pmverma/hibernate-mapsid-test" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/pmverma/hibernate-mapsid-test</a><br> <a href="https://github.com/vladmihalcea/high-performance-java-persistence/pull/36" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/vladmihalcea/high-performance-java-persistence/pull/36</a></p> </td>
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