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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-12463" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-4c9a0113-96e0-4e34-aad8-cd994adfac36" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12463" style="color: #3b73af; text-decoration: none">HHH-12463</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-12463" style="color: #3b73af; text-decoration: none">Memory leak in QueryPlanCache for certain queries</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-4c9a0113-96e0-4e34-aad8-cd994adfac36" 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"> 4.2.7.SP1 </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: 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"> 05/Apr/2018 09:20 AM </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"> any </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-41dd5801-1ec5-4b50-9eb2-0ff312637036" 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="jeroen.borgers" id="email_jeroen.borgers" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=jeroen.borgers" style="color:#6c797f;; color: #3b73af; text-decoration: none">Jeroen Borgers</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">We suffer from the same problem as reported in <span class="jira-issue-macro resolved" data-jira-key="HHH-2470"> <a href="https://hibernate.atlassian.net/browse/HHH-2470" class="jira-issue-macro-key issue-link" title="Use of session.createSQLQuery causes memory leak (Harry Mark and Michael Stevens)" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12158&avatarType=issuetype"> HHH-2470 </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> .</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">MAT shows a growing heap consumption by the QueryPlanCache and growing number of NativeSQLQueryPlan and SQLCustomQuery. The numbers and heap consumption double when testing twice as long.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We see many duplicate NativeSQLQueryPlan objects on the heap. <br> <span class="jira-issue-macro resolved" data-jira-key="HHH-2470"> <a href="https://hibernate.atlassian.net/browse/HHH-2470" class="jira-issue-macro-key issue-link" title="Use of session.createSQLQuery causes memory leak (Harry Mark and Michael Stevens)" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12158&avatarType=issuetype"> HHH-2470 </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> is reported as fixed by properly implementing equals and hashCode in NativeSQLQuerySpecification which is used as key in the cache. <br> It has NativeSQLQueryScalarReturn and NativeSQLQueryNonScalarReturn as possible members and those equals and hashCode methods are implemented in this fix.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">When I look for differences between duplicates on the heap, I see that the key.queryString.hashCode is identical. Yet, the key.hashCode is <b>not</b>!</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">hashCodes are identical for those NativeSQLQueryScalarReturn objects in the queryReturns array which have a standard type like StringType. However, they are <b>not</b> identical if they have a CustomType! <br> NativeSQLQueryScalarReturn.equals calls type.equals and CustomType does not implement equals nor hashCode. So. it returns the identity equals and hashCode inherited from Object and the keys will not be equal while they should be.</p> </td>
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