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java.lang.RuntimeException: could not flush session	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.flushSession(Hibernate2BatchProcessor.java:178)	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.commitTransaction(Hibernate2BatchProcessor.java:115)	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.afterProcessBatch(Hibernate2BatchProcessor.java:46)	at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.processBatch(AbstractBatchProcessor.java:159)	at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.execute(AbstractBatchProcessor.java:132)	at com.atlassian.crowd.embedded.hibernate2.HibernateGroupDao.addAll(HibernateGroupDao.java:135)	at com.atlassian.confluence.user.crowd.CachedCrowdGroupDao.addAll(CachedCrowdGroupDao.java:144)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:16)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at com.sun.proxy.$Proxy113.addAll(Unknown Source)	at com.atlassian.crowd.directory.CachingDirectory.addAllGroups(CachingDirectory.java:115)	at com.atlassian.crowd.directory.DbCachingRemoteChangeOperations.addGroups(DbCachingRemoteChangeOperations.java:569)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at com.atlassian.crowd.directory.$Proxy1723.addGroups(Unknown Source)	at com.atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations.addOrUpdateCachedGroups(DirectoryCacheImplUsingChangeOperations.java:90)	at com.atlassian.crowd.directory.ldap.cache.RemoteDirectoryCacheRefresher.synchroniseAllGroups(RemoteDirectoryCacheRefresher.java:114)	at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseAll(AbstractCacheRefresher.java:91)	at com.atlassian.crowd.directory.ldap.cache.EventTokenChangedCacheRefresher.synchroniseAll(EventTokenChangedCacheRefresher.java:67)	at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:1122)	at com.atlassian.crowd.manager.directory.DirectorySynchroniserImpl.synchronise(DirectorySynchroniserImpl.java:76)	at com.atlassian.crowd.directory.DbCachingDirectoryPoller.pollChanges(DbCachingDirectoryPoller.java:50)	at com.atlassian.crowd.manager.directory.monitor.poller.DirectoryPollerJobRunner.runJob(DirectoryPollerJobRunner.java:93)	at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:153)	at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:118)	at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:97)	at com.atlassian.scheduler.quartz1.Quartz1Job.execute(Quartz1Job.java:32)	at org.quartz.core.JobRunShell.run(JobRunShell.java:223)	at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool.lambda$runInThread$311(ConfluenceQuartzThreadPool.java:19)