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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" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11146" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a93602c4-1031-4677-819b-11761f531199" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11146" style="color: #3b73af; text-decoration: none">HHH-11146</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-11146" style="color: #3b73af; text-decoration: none">Merge of persisted parent with unsaved children results in empty copies of children</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">Issue Type:</th>
<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-a93602c4-1031-4677-819b-11761f531199" 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"> 5.0.10, 5.2.2 </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">Assignee:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </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"> 30/Sep/2016 07:20 AM </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-ed1554a4-ee9b-4d0f-9b6f-56bcb414202e" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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">Reporter:</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="BuurmanSven" id="email_BuurmanSven" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=BuurmanSven" style="color:#6c797f;; color: #3b73af; text-decoration: none">Sven H</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">Note: Bug first noticed in our code on Hibernate 5.0.10.Final. <br> Created a testcase on 5.2.2.Final with the exact same behavior. Testcase attached.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If </p>
<ul class="alternate" type="square">
<li>you have a previously-persisted parent entity A with a ManyToOne list property B of not-yet-persisted entities C</li>
<li>and there is no cascade-setting on B (defaults to empty list) *</li>
<li>and you perform a merge on A (`entityManager.merge(A);`)</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">you'll end up with A containing for it's property B a collection of "empty copies" of C, call them C', which are newly-constructed objects without the attribute values C had.<br> Obviously, this leads to problems and is an unwanted situation.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This seems to come from the `null` value on CollectionType#549<br> ```while ( iter.hasNext() ) </p> { result.add( elemType.replace( iter.next(), null, session, owner, copyCache ) ); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">combined with EntityType#352-357<br> ```if ( session.getContextEntityIdentifier( original ) == null &&<br> ForeignKeys.isTransient( associatedEntityName, original, Boolean.FALSE, session ) ) </p> { final Object copy = session.getEntityPersister( associatedEntityName, original ) .instantiate( null, session ); copyCache.put( original, copy ); return copy; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">which says that if original (child object C) is unsaved then a new instantion of C should be created and returned.</p> </td>
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