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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-10746" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a3cc2d40-ef17-47be-9c29-af71cd0297cc" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10746" style="color: #3b73af; text-decoration: none">HHH-10746</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-10746" style="color: #3b73af; text-decoration: none">Criteria API drastically degrades performance</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">Change By:</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="RemoM" id="email_RemoM" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=RemoM" style="color:#6c797f;; color: #3b73af; text-decoration: none">RemoM</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"> <span class="diffcontext">Especially in multi-threaded in environments, the classloader is accessed way to often to convert the Criteria Query into SQL. In some containers like Tomcat we observed that the classloader is synchronized. This combination drastically degrades performance of our application servers.<br><br>see<br><br>http://dimovelev.blogspot.ch/2015/02/performance-pitfalls-hibernate-criteria.html<br><br>or <br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">http://stackoverflow.com/questions/26608973/synchronized-classloader-calls-from-hibernate/37279205#37279205<br><br>or<br><br></span> <span class="diffcontext">https://hibernate.atlassian.net/browse/HHH-9895<br><br>which was closed without further information. The code in question:<br><br>{code}<br>Thread [main] (Suspended (breakpoint at line 191 in ReflectHelper)) <br>owns: QueryTranslatorImpl (id=8378) <br>ReflectHelper.classForName(String) line: 191 <br>ReflectHelper.getConstantValue(String) line: 279 <br>QueryTranslatorImpl$JavaConstantConverter.handleDotStructure(AST) line: 624 <br>QueryTranslatorImpl$JavaConstantConverter.visit(AST) line: 619 <br>NodeTraverser.visitDepthFirst(AST) line: 78 <br>NodeTraverser.traverseDepthFirst(AST) line: 67 <br>QueryTranslatorImpl.parse(boolean) line: 300 <br>QueryTranslatorImpl.doCompile(Map, boolean, String) line: 203 <br>QueryTranslatorImpl.compile(Map, boolean) line: 158 <br>HQLQueryPlan.<init>(String, String, boolean, Map<String,Filter>, SessionFactoryImplementor, EntityGraphQueryHint) line: 131 <br>HQLQueryPlan.<init>(String, boolean, Map<String,Filter>, SessionFactoryImplementor) line: 93 <br>QueryPlanCache.getHQLQueryPlan(String, boolean, Map<String,Filter>) line: 167 <br>SessionImpl(AbstractSessionImpl).getHQLQueryPlan(String, boolean) line: 301 <br>SessionImpl(AbstractSessionImpl).createQuery(String) line: 236 <br>SessionImpl.createQuery(String) line: 1800 <br>EntityManagerImpl(AbstractEntityManagerImpl).createQuery(String, Class<T>, Selection, QueryOptions) line: 568 <br>CriteriaQueryImpl$1.buildCompiledQuery(HibernateEntityManagerImplementor, InterpretedParameterMetadata) line: 336 <br>CriteriaCompiler.compile(CompilableCriteria) line: 147 <br>EntityManagerImpl(AbstractEntityManagerImpl).createQuery(CriteriaQuery<T>) line: 736<br>Activity<br>{code}<br><br>A solution/workaround for this problem is necssary.</span> </td>
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