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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/OGM" style="color: #3b73af; text-decoration: none">Hibernate OGM</a> / <a href="https://hibernate.atlassian.net/browse/OGM-1259" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6a1d40a3-872f-4f00-81d0-b308ae121cb7" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/OGM-1259" style="color: #3b73af; text-decoration: none">OGM-1259</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/OGM-1259" style="color: #3b73af; text-decoration: none">Figure out why the order of the operation matters</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-6a1d40a3-872f-4f00-81d0-b308ae121cb7" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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"> 01/Mar/2017 03:38 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"> 5.2-next </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="davided" id="email_davided" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=davided" style="color:#6c797f;; color: #3b73af; text-decoration: none">Davide D'Alto</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">While working on the hibernate-demos project we had to apply the following change:<br> from</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">public</span> Hike createHike(Hike hike, Trip recommendedTrip) {
entityManager.persist( hike );
<span class="code-keyword" style="color: #000091">if</span> ( recommendedTrip != <span class="code-keyword" style="color: #000091">null</span> ) {
recommendedTrip = entityManager.merge( recommendedTrip );
hike.recommendedTrip = recommendedTrip;
recommendedTrip.availableHikes.add( hike );
}
<span class="code-keyword" style="color: #000091">return</span> hike;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">to </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">public</span> Hike createHike(Hike hike, Trip recommendedTrip) {
<span class="code-keyword" style="color: #000091">if</span> ( recommendedTrip != <span class="code-keyword" style="color: #000091">null</span> ) {
recommendedTrip = entityManager.merge( recommendedTrip );
hike.recommendedTrip = recommendedTrip;
recommendedTrip.availableHikes.add( hike );
}
entityManager.persist( hike );
<span class="code-keyword" style="color: #000091">return</span> hike;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Emmanuel possible explanation:</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">here is my pseudo scientific proposal.<br> In the code, we do a persist which triggers an insert request, then we add a link to the object which triggers an update request. Could it be that somehow, when the batch operation is happening, the two operations are 1. not collapsed 2. the second update is transformed into an insert. That would explain the behavior.<br> Maybe that can lead you to an explanation of the bug.</p>
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