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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-12621" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-32062a53-4b6c-4e67-855c-09c7de9d33cd" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12621" style="color: #3b73af; text-decoration: none">HHH-12621</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-12621" style="color: #3b73af; text-decoration: none">Thread-unsafe behavior of Query Spaces in Named Queries</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-32062a53-4b6c-4e67-855c-09c7de9d33cd" 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"> 5.1.13, 5.3.0.Final </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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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> HibernateThreadUnsafeSample.rar </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"> 23/May/2018 12:09 PM </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"> hibernate-core, gradle, JDK 8 </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-minor-e53d3fd6-de47-4d96-ad08-767c43ce6687" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </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="VeselRoger" id="email_VeselRoger" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=VeselRoger" style="color:#6c797f;; color: #3b73af; text-decoration: none">Роджер Весёлый</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"><b>Problem:</b> Thread-unsafe behavior of query spaces in named queries<br> I catch <b>ConcurrentModificationException</b> sometimes when execute Native Queries.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Information:</b></p>
<ol>
<li><b>emf.addNamedQuery</b><br> When we want to save Query with defined name we should use EntityManagerFactory#addNamedQuery<br> This method build new NamedSQLQueryDefinition from saved Query.<br> NamedSQLQueryDefinition created by NamedSQLQueryDefinitionBuilder</li>
<li><b>NamedSQLQueryDefinitionBuilder</b><br> NamedSQLQueryDefinitionBuilder use method createNamedQueryDefinition for NamedSQLQueryDefinition build.<br> This method use querySpacesCopy() for safe copying of elements from querySpaces.</li>
<li><b>em.createNamedQuery</b><br> When we want to create new instance of Query by name we should use EntityManager#createNamedQuery <br> We get NamedSQLQueryDefinition from NamedQueryRepository by query name.<br> <ins>Version 5.1.14:</ins><br> Our new query (new SQLQueryImpl) will get NamedSQLQueryDefinition<br> Also, new query get all query spaces: this.querySpaces = queryDef.getQuerySpaces();<br> <ins>Version 5.3.0:</ins><br> The same behavior in NativeQueryImpl class</li>
<li><b>Thead-safe or not Thread-safe?</b><br> SQLQueryImpl copy reference to NamedSQLQueryDefinition query spaces collection, not makes copy (like NamedSQLQueryDefinitionBuilder).<br> So, every Named Query created by the same name share one query spaces collection.<br> It's not thread safe, not obvious and unpredictably.</li>
</ol> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Suggestion:</b> create copy of query spaces in SQLQueryImpl constructor with NamedSQLQueryDefinition</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Links</b>:<br> <ins>Version 5.1.14 source code</ins>:<br> <a href="https://github.com/hibernate/hibernate-orm/blob/5.1.14/hibernate-core/src/main/java/org/hibernate/internal/SQLQueryImpl.java#L85" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-orm/blob/5.1.14/hibernate-core/src/main/java/org/hibernate/internal/SQLQueryImpl.java#L85</a><br> <ins>Version 5.3.0.Final source code</ins>:<br> <a href="https://github.com/hibernate/hibernate-orm/blob/5.3.0.Final/hibernate-core/src/main/java/org/hibernate/query/internal/NativeQueryImpl.java#L85" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-orm/blob/5.3.0.Final/hibernate-core/src/main/java/org/hibernate/query/internal/NativeQueryImpl.java#L85</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">To reproduce the error:</p>
<ol>
<li>Import Gradle project from <span class="nobr"><a href="https://hibernate.atlassian.net/secure/attachment/49248/49248_HibernateThreadUnsafeSample.rar" title="HibernateThreadUnsafeSample.rar attached to HHH-12621" data-attachment-type="file" data-attachment-name="HibernateThreadUnsafeSample.rar" data-media-services-type="file" data-media-services-id="201a02f0-49cc-4596-b65a-16eca980be55" style="color: #3b73af; text-decoration: none">HibernateThreadUnsafeSample.rar<sup><img class="rendericon" src="cid:jira-generated-image-static-link_attachment_7-be77e2d6-a396-4b0a-9e66-e25666007a06" height="7" width="7" align="absmiddle" alt="" border="0"></sup></a></span></li>
<li>Perform tests from AppTest test class.</li>
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