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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=eyJpIjoiNWJiNjA2OWRhZmJkNDIwMzlmZmUzYjI4ZDQyMjNhZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13795?atlOrigin=eyJpIjoiNWJiNjA2OWRhZmJkNDIwMzlmZmUzYjI4ZDQyMjNhZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a3495946-1082-4c54-b2e6-38dc46e3454d" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13795?atlOrigin=eyJpIjoiNWJiNjA2OWRhZmJkNDIwMzlmZmUzYjI4ZDQyMjNhZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13795</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-13795?atlOrigin=eyJpIjoiNWJiNjA2OWRhZmJkNDIwMzlmZmUzYjI4ZDQyMjNhZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Find entity by primary key does not seem to respect EntityGraph if entity is returned from cache.</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-a3495946-1082-4c54-b2e6-38dc46e3454d" 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"> 5.3.13 </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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<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"> 23/Dec/2019 04:28 AM </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">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Wildfly 18.0.1, JDK 11.0.5 </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="thorsten.moeller" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_thorsten.moeller" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5af016599abb77267ba6af62"> Thorsten Möller </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">Found the following problem today:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Consider an entity E that has some relationship(s) to other <b>lazily</b> loaded entities (1:1, 1:n, or n:m - doesn't really matter for this issue). Assume we want to fetch two instances of E, one of them should load "more" data than the other, which is achieved by means of an entity graph:</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-object" style="color: #910091">Class</span> clazz = ... <span class="code-comment" style="color: #808080">// Entity class.
</span><span class="code-object" style="color: #910091">String</span> pk1 = ..., pk2 = ... <span class="code-comment" style="color: #808080">// primary keys of the entities we want to fetch.
</span>E e1 = entityManager.find(clazz, pk1);
E e2 = entityManager.find(clazz, pk2, Map.of(org.hibernate.annotations.QueryHints.FETCHGRAPH, <span class="code-quote" style="color: #009100">"MyEntityGraphThatWouldReferSomeOfEsRelationships"</span>);
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There problem occurs for the special case when <tt>pk1</tt> <em>equals</em> <tt>pk2</tt>; i.e., when the <em>same</em> entity is fetched twice, though we want to fetch "more" data for <tt>e2</tt> (e.g., some of its relationships) than for <tt>e1</tt>. Using the environment mentioned by this issue, the entity graph for <tt>e2</tt> is not considered in that case, seemingly because the object assigned to <tt>e2</tt> is returned from the cache, as it has been fetched just before for <tt>e1</tt>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It might be a corner case, but I think <tt>e2</tt> should be assigned an object that has <em>all</em> the data mentioned by the entity graph specified loaded; whether it would be another instance (i.e. <tt>e1 == e2</tt> is <tt>false</tt>) or the same instance (i.e. <tt>e1 == e2</tt> is <tt>true</tt>) is an implementation detail. The latter seems preferable and could be achieved by dynamically setting the entity attributes mentioned in the entity graph of the second find in the cached entity instance and return it from the second find.</p> </td>
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