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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-12747" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-4819731c-d2a9-4be1-9ab6-f091c7183376" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12747" style="color: #3b73af; text-decoration: none">HHH-12747</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-12747" style="color: #3b73af; text-decoration: none">Eagerly fetch foreign key of lazy ManyToOne POJO associations.</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-4819731c-d2a9-4be1-9ab6-f091c7183376" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </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"> 5.3.1 </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"> Unassigned </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"> 28/Jun/2018 23:50 PM </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-f48cb47f-fccc-4f17-813e-eb8e20ebb851" 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="selaron" id="email_selaron" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=selaron" style="color:#6c797f;; color: #3b73af; text-decoration: none">Selaron</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">For bytecode enhanced entities with lazy non-proxy ManyToOne properties, the foreign key column could be fetched with default fetchgroup like simple properties.<br> This would reduce the number of SQL queries sent to the persistence store.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Currently for n lazy ManyToOne properties, n SQL queries are sent like:</p>
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<pre class="code-sql" 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">select</span> <span class="code-keyword" style="color: #000091">c</span>.parent_id <span class="code-keyword" style="color: #000091">FROM</span> child_table <span class="code-keyword" style="color: #000091">c</span> <span class="code-keyword" style="color: #000091">where</span> <span class="code-keyword" style="color: #000091">c</span>.id = ?;
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is even true if the Child entity from child_table has been received from 2nd level cache itself and ManyToOne properties had gotten initialized in a different Session before and could hence also be present in L2 cache. <br> The 2nd level cache does not get updated with initialized ManyToOne properties.</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">
org.hibernate.persister.entity.AbstractEntityPersister.initializeLazyProperty(<span class="code-object" style="color: #910091">String</span>, <span class="code-object" style="color: #910091">Object</span>, SharedSessionContractImplementor)
...
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Object</span> ce = CacheHelper.fromSharedCache( session, cacheKey, cacheAccess );
<span class="code-keyword" style="color: #000091">if</span> ( ce != <span class="code-keyword" style="color: #000091">null</span> ) {
<span class="code-keyword" style="color: #000091">final</span> CacheEntry cacheEntry =
(CacheEntry) getCacheEntryStructure().destructure( ce, factory );
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Object</span> initializedValue =
initializeLazyPropertiesFromCache( fieldName, entity, session, entry, cacheEntry );
<span class="code-keyword" style="color: #000091">if</span> (initializedValue != LazyPropertyInitializer.UNFETCHED_PROPERTY) {
<span class="code-comment" style="color: #808080">// NOTE EARLY EXIT!!!
</span> <span class="code-keyword" style="color: #000091">return</span> initializedValue;
}
}
...
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The early exit return in AbstractEntityPersister.java line 1101 never executes for ManyToOne properties.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I'd suggest to either</p>
<ul>
<li>update the L2 cache on ManyToOne lazy initialization so it can later be fulle received from L2 cache without SQL interaction</li>
<li>or fetch FK eagerly in default fetch group like other simple properties and add it to L2 cache.</li>
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