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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-12107" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-7ab56763-15d1-43b1-8cc1-97ce7bfddc64" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12107" style="color: #3b73af; text-decoration: none">HHH-12107</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-12107" style="color: #3b73af; text-decoration: none">ClassCastException when using L2Cache with "structured_cache"=true </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-7ab56763-15d1-43b1-8cc1-97ce7bfddc64" 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"> 5.2.3 </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-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"> 20/Nov/2017 04:14 AM </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-ebc6ec21-9014-42b9-ba5a-43579424de7b" 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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="jorgen.risholt" id="email_jorgen.risholt" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=jorgen.risholt" style="color:#6c797f;; color: #3b73af; text-decoration: none">Jörgen Risholt</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">The problem was introduced with the <a href="https://hibernate.atlassian.net/browse/HHH-11097" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">HHH-11097</a>, see some backround at: <a href="https://forum.hibernate.org/viewtopic.php?f=1&t=1045007&p=0&e=0&sid=36dda1e68542bdfdd141992810faf32e" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">ClassCastException: Object; cannot be cast to Collection</a>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Have a local tetscase written for the problem in org.hibernate.test.querycache.QueryCacheTest and will push that. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The root caus is the method that creates the "loggableString" that was changed in the above <span class="jira-issue-macro resolved" data-jira-key="HHH-11097">
<!-- replace the span with an AUI template --> <a href="https://hibernate.atlassian.net/browse/HHH-11097" class="jira-issue-macro-key issue-link" title="Performance problem if cached entity has attribute state with an expensive toString() method (LOB, etc)" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12143&avatarType=issuetype"> HHH-11097 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-success 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">Closed</span> </span> . However there are a few precondition that is needed to see the problem:</p>
<ul>
<li>USE_SECOND_LEVEL_CACHE = true</li>
<li>USE_STRUCTURED_CACHE = true</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Then the class that is to be persisted into the L2Cache must have an embededId and at least some attribute that is a "OneToMany", "MenuToMany", etc. The fault occurs when we get a hit in the L2Cache when we try to read it: </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">{{Caused by: java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.util.Collection<br> at org.hibernate.type.CollectionType.getElementsIterator(CollectionType.java:250)<br> at org.hibernate.type.CollectionType.renderLoggableString(CollectionType.java:208)<br> at org.hibernate.type.CollectionType.toLoggableString(CollectionType.java:198)<br> at org.hibernate.type.TypeHelper.toLoggableString(TypeHelper.java:439)<br> at org.hibernate.cache.spi.entry.StructuredCacheEntry.destructure(StructuredCacheEntry.java:54)<br> at org.hibernate.event.internal.DefaultLoadEventListener.processCachedEntry(DefaultLoadEventListener.java:612)<br> at org.hibernate.event.internal.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:602)<br> at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:462)<br> at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)<br> at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)<br> at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)<br> at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)<br> at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1239)<br> at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1122)<br> at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:646)<br> at org.hibernate.type.EntityType.resolve(EntityType.java:431)<br> at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:165)<br> at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:125)<br> at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1152)<br> at org.hibernate.loader.Loader.processResultSet(Loader.java:1011)<br> at org.hibernate.loader.Loader.doQuery(Loader.java:949)<br> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)<br> at org.hibernate.loader.Loader.doList(Loader.java:2692)<br> at org.hibernate.loader.Loader.doList(Loader.java:2675)<br> at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2507)<br> at org.hibernate.loader.Loader.list(Loader.java:2502)<br> at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:502)<br> at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:384)<br> at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)<br> at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1490)<br> at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1445)<br> at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1414)<br> at org.hibernate.query.Query.getResultList(Query.java:146)<br> at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:72)}}</p> </td>
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