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<td class="page-title-pattern-first-line " style="padding: 0px; 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-10842" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-89ca2dae-4e40-4671-a0d5-ea13a7430669" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10842" style="color: #3b73af; text-decoration: none">HHH-10842</a> </td>
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<td class="has-icon" style="padding: 0px; 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-89ca2dae-4e40-4671-a0d5-ea13a7430669" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.0 </td>
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<td style="padding: 0px; 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: 0px; 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 13/Jun/2016 02:28 AM </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="OliverB" id="email_OliverB" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=OliverB" style="color:#6c797f;; color: #3b73af; text-decoration: none">Oliver Breidenbach</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">We have an User entity. To collect some statistics we have a database view, counting comments, for instance. This view is mapped by a UserStatistic entity.<br> The User entity references the UserStatistics. As the UserStatistic represents a database view it has the same id as the User entity and is referenced by the id column.</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> class User {
@Id
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> id;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> name;
@OneToOne(fetch = FetchType.LAZY, optional = <span class="code-keyword" style="color: #000091">false</span>)
@JoinColumn(name=<span class="code-quote" style="color: #009100">"id"</span>, referencedColumnName=<span class="code-quote" style="color: #009100">"id"</span>, insertable=<span class="code-keyword" style="color: #000091">false</span>, updatable=<span class="code-keyword" style="color: #000091">false</span>)
<span class="code-keyword" style="color: #000091">public</span> UserStatistic userStatistic;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Doing a query with a loadgraph loading the statistics for the user, everything is fine.<br> The sql is as aspected.</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">SELECT
user0_.id AS id1_0_0_,
userstatis1_.id AS id1_1_1_,
user0_.name AS name2_0_0_,
userstatis1_.commentCount AS commentC2_1_1_
FROM
USER user0_
LEFT OUTER JOIN UserStatistic userstatis1_
ON
user0_.id=userstatis1_.id
WHERE
user0_.id=1
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">If the user is get by id the statistic is missing. The sql.</p>
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<pre style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">SELECT
user0_.id AS id1_0_0_,
user0_.name AS name2_0_0_
FROM
USER user0_
WHERE
user0_.id=?
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I did some debugging and found the following reason:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
MetamodelGraphWalker.visitAttributeDefinition
line 144:
<span class="code-keyword" style="color: #000091">if</span> ( isDuplicateAssociationKey( associationKey ) ) {<span class="code-comment" style="color: #808080">// AssociationKey(table=User, columns={id})
</span> log.debug( <span class="code-quote" style="color: #009100">"Property path deemed to be circular : "</span> + subPath.getFullPath() );
strategy.foundCircularAssociation( associationAttributeDefinition );
<span class="code-comment" style="color: #808080">// EARLY EXIT!!!
</span> <span class="code-keyword" style="color: #000091">return</span>;
}
AbstractLoadPlanBuildingAssociationVisitationStrategy
line 185:
<span class="code-comment" style="color: #808080">// also add an AssociationKey <span class="code-keyword" style="color: #000091; color: #808080">for</span> the root so we can later on recognize circular references back to the root.
</span> <span class="code-keyword" style="color: #000091">final</span> Joinable entityPersister = (Joinable) entityDefinition.getEntityPersister();
associationKeyRegistered(
<span class="code-keyword" style="color: #000091">new</span> AssociationKey( entityPersister.getTableName(), entityPersister.getKeyColumnNames() )
);
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In AbstractLoadPlanBuildingAssociationVisitationStrategy an AssociationKey with table name and column name is generated to prevent circular references.<br> As the user statistics uses the same column it is ignored in MetamodelGraphWalker.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I am willing to deliver a patch for this bug, but I am not sure what would be the best way to solve it.<br> To prevent circular refer it should either take the referenced table into account or the attribute in the entity?</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Why is this not happening if I get the entity by a query?<br> PR with testcase will follow.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Seems to be very simular to: <span class="jira-issue-macro" data-jira-key="HHH-10745">
<!-- replace the span with an AUI template --> <a href="https://hibernate.atlassian.net/browse/HHH-10745" class="jira-issue-macro-key" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12143&avatarType=issuetype"> HHH-10745 </a> - <span class="summary">Relations are not loaded when using Fetch Profiles</span> <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> </p> </td>
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