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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: 10px 0 0; margin-top: 0">The only way to improve on the pull request would be for Hibernate to track those entities that are not found when a batch is executed. Unfortunately, that would cause an inconsistency when using batch fetching versus not using it.</p> <p style="margin: 10px 0 0">Here is an example using Employee#task, where:</p>
<ul>
<li>the corresponding Employee column has task ID set to 1;</li>
<li>there is no Task entity with that ID.</li>
</ul>
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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">
doInHibernate(
<span class="code-keyword" style="color: #000091">this</span>::sessionFactory, session -> {
Employee employee = session.get( Employee.class, <span class="code-quote" style="color: #009100">"employee01"</span> );
assertNull( employee.task );
<span class="code-comment" style="color: #808080">// In a different Session, add a Task with ID == 1
</span> doInHibernate(
<span class="code-keyword" style="color: #000091">this</span>::sessionFactory, session1 -> {
Task task = <span class="code-keyword" style="color: #000091">new</span> Task( 1 );
session.persist( task );
}
);
session.refresh( employee );
<span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">if</span> batch fetching is used and Hibernate tracks entities that were not found, then the following will fail
</span> assertNotNull( employee.task );
}
);
</pre>
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</div> <p style="margin: 10px 0 0">A possible improvement would be to only track entities that were not found only while an operation is in progress. Unfortunately, that would be difficult to do until we have OperationContext functionality, but that won't be available until Hibernate 6.0 when <span class="jira-issue-macro" data-jira-key="HHH-10478">
<!-- replace the span with an AUI template --> <a href="https://hibernate.atlassian.net/browse/HHH-10478" class="jira-issue-macro-key issue-link" title="Introduce an OperationContext to cache data needed while an operation is in progress" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12150&avatarType=issuetype"> HHH-10478 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> is fixed.</p> </td>
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