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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-10852" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-96596ebf-84a6-4422-aad3-421019f5e958" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10852" style="color: #3b73af; text-decoration: none">HHH-10852</a> </td>
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<td style="vertical-align: top;; padding: 0px; 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-10852" style="color: #3b73af; text-decoration: none">org.hibernate.WrongClassException after setting default_batch_fetch_size</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: 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-96596ebf-84a6-4422-aad3-421019f5e958" 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 4.3.11, 4.3.5 </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">Assignee:</th>
<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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<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: 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"> 14/Jun/2016 09:48 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Hibernate 4.3.5 and 4.3.11, Ubuntu Desktop 14.04, database MySQL </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">Priority:</th>
<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-static-major-d87bbf35-605f-402b-9893-12a5211cef36" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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">Reporter:</th>
<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="sergiuhlihor" id="email_sergiuhlihor" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=sergiuhlihor" style="color:#6c797f;; color: #3b73af; text-decoration: none">Sergiu Hlihor</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">In order optimize the load time of our entities, we set the default_batch_fetch_size to 256 (previously the value was not set at all). Now during a specific operation in which we load a set of entities, some of them with eager loading and some of them with lazy loading, we get the exception from below. The data model is the following:<br> A - entity<br> B1 and B2 entities where B2 extends B1 and both B1 and B2 are stored in same table but differentiated by DTYPE<br> C - entity<br> Entity A contains a list of B1 and B2 entities (eager loading) and only B2 contains a list of C entities which are lazy loaded. <br> The exception happens when loading all A entities at once and going through B1/B2 list and trying to access first entity from list of C entities (which for that specific case are loaded lazily). <br> When debugged, the object referenced in exception is totally unrelated to the entity accessed.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The stacktrace was generated using Hibernate 4.3.5, however the issue is also reproducible on 4.3.11</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">org.hibernate.WrongClassException: Object <span class="error">[id=4010]</span> was not of the specified subclass <span class="error">[B2]</span> : loaded object was of wrong class class B1<br> at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1550)<br> at org.hibernate.loader.Loader.getRow(Loader.java:1503)<br> at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:725)<br> at org.hibernate.loader.Loader.processResultSet(Loader.java:952)<br> at org.hibernate.loader.Loader.doQuery(Loader.java:920)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:324)<br> at org.hibernate.loader.Loader.loadCollectionBatch(Loader.java:2299)<br> at org.hibernate.loader.collection.plan.LegacyBatchingCollectionInitializerBuilder$LegacyBatchingCollectionInitializer.initialize(LegacyBatchingCollectionInitializerBuilder.java:100)<br> at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:693)<br> at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:92)<br> at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1897)<br> at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:558)<br> at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:260)<br> at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554)<br> at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142)<br> at org.hibernate.collection.internal.PersistentBag.get(PersistentBag.java:466)</p> </td>
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