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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-12279" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-2babdc94-d5f2-48ba-bacb-c3aaabff705c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12279" style="color: #3b73af; text-decoration: none">HHH-12279</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-12279" style="color: #3b73af; text-decoration: none">FetchMode.SUBSELECT is ignored when a Callback or EntityListener is present</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-2babdc94-d5f2-48ba-bacb-c3aaabff705c" 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"> 5.2.12 </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">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-entitymanager </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"> 08/Feb/2018 08:36 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"> JVM: Oracle Java SE 8 <br> Database: Oracle XE 11g, with ojdbc8 12.2.0.1 drivers </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-0a5a6b36-74b3-4baa-b849-6233ce4b73b4" 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="npiguet" id="email_npiguet" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=npiguet" style="color:#6c797f;; color: #3b73af; text-decoration: none">Nicolas Piguet</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">Consider the following simplified example:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">```java<br> @Table(name = "CONTAINER")<br> class Container {<br> @OneToMany(fetch = FetchType.EAGER)<br> @JoinColumn(name = "CONTAINER_ID", referencedColumnName = "ID")<br> @MapKey(name = "key")<br> @Fetch(FetchMode.SUBSELECT)<br> private Map<Longs, MappedAttribute> mappedAttributes;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Transient<br> private BusinessAttribute businessAttribute;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @PostLoad<br> private void postLoad()</p> { this.businessAttribute = new BusinessAttribute(mappedAttributes); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Table(name = "ATTRIBUTES")<br> class MappedAttribute </p> { ... } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">class BusinessAttribute {<br> public BusinessAttribute(List<MappedAttribute> args){}<br> }<br> ```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">When I call </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">``` <br> entityManager.createQuery("Select c from " + Container.class.getName() + " c where c.id in (1, 2, 3, 4)").getResultList();<br> ```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Then hibernate executes the following SQL (simplified a little bit, for confidentiality)</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">```sql<br> – First select the root objects<br> select * from CONTAINER where ID in (1,2,3,4); <br> – Then select all the attribute rows for each root object in individual queries<br> select * from ATTRIBUTES where CONTAINER_ID = 1;<br> select * from ATTRIBUTES where CONTAINER_ID = 2;<br> select * from ATTRIBUTES where CONTAINER_ID = 3;<br> select * from ATTRIBUTES where CONTAINER_ID = 4;<br> ```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is the kind of 1+N SQL queries that I would expect to see if I had set <tt>FetchMode.SELECT</tt>, and does not seem consistent with <tt>FetchMode.SUBSELECT</tt></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If I comment out the <tt>@PostLoad</tt> annotation on <tt>Container.postLoad()</tt>, then hibernate runs the following SQL queries:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">```sql<br> – First select the root objects<br> select * from CONTAINER where ID in (1,2,3,4);<br> – The select all the attributes for all root objects at once<br> select * from ATTRIBUTES where CONTAINER_ID in (<br> select ID from CONTAINER where ID in (1,2,3,4)<br> );<br> ```</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Which is what I had expected it to do.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><tt>@PostConstruct</tt> annotations should not disable <tt>FetchMode.SUBSELECT</tt> when all of the persistent attributes are eagerly loaded, or when the callback (or entity listener) does not alter any of the persistent properties of the parent entity. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">In my case, all of my fields are either basic, transient or associations annotated with <tt>FetchType.EAGER</tt>, so there is no chance that whatever happens in the <tt>postConstruct()</tt> method would affect any association. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Alternately, if it is impossible or impractical to detect that the whole entity and all its associations are eagerly loaded, hibernate should provide a mechanism so that a developper can specify the behavior of the listener to hibernate (maybe via an <tt>@ListenerProperties(TRANSIENT_ONLY)</tt> annotation, or maybe with another <tt>@Parameters</tt> annotation.</p> </td>
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