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.
see
http://dimovelev.blogspot.ch/2015/02/performance-pitfalls-hibernate-criteria.html
or
http://stackoverflow.com/questions/26608973/synchronized-classloader-calls-from-hibernate/37279205#37279205
or
https://hibernate.atlassian.net/browse/HHH-9895
which was closed without further information. The code in question:
{code}
Thread [main] (Suspended (breakpoint at line 191 in ReflectHelper))
owns: QueryTranslatorImpl (id=8378)
ReflectHelper.classForName(String) line: 191
ReflectHelper.getConstantValue(String) line: 279
QueryTranslatorImpl$JavaConstantConverter.handleDotStructure(AST) line: 624
QueryTranslatorImpl$JavaConstantConverter.visit(AST) line: 619
NodeTraverser.visitDepthFirst(AST) line: 78
NodeTraverser.traverseDepthFirst(AST) line: 67
QueryTranslatorImpl.parse(boolean) line: 300
QueryTranslatorImpl.doCompile(Map, boolean, String) line: 203
QueryTranslatorImpl.compile(Map, boolean) line: 158
HQLQueryPlan.<init>(String, String, boolean, Map<String,Filter>, SessionFactoryImplementor, EntityGraphQueryHint) line: 131
HQLQueryPlan.<init>(String, boolean, Map<String,Filter>, SessionFactoryImplementor) line: 93
QueryPlanCache.getHQLQueryPlan(String, boolean, Map<String,Filter>) line: 167
SessionImpl(AbstractSessionImpl).getHQLQueryPlan(String, boolean) line: 301
SessionImpl(AbstractSessionImpl).createQuery(String) line: 236
SessionImpl.createQuery(String) line: 1800
EntityManagerImpl(AbstractEntityManagerImpl).createQuery(String, Class<T>, Selection, QueryOptions) line: 568
CriteriaQueryImpl$1.buildCompiledQuery(HibernateEntityManagerImplementor, InterpretedParameterMetadata) line: 336
CriteriaCompiler.compile(CompilableCriteria) line: 147
EntityManagerImpl(AbstractEntityManagerImpl).createQuery(CriteriaQuery<T>) line: 736
Activity
{code}
A solution/workaround for this problem is necssary. |
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