Synchronization of Crowd results in Error 'query did not return a unique result'
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
Synchronization of Crowd throws an error in the log file:
The following appears in the logs:
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2011-08-17 16:13:48,405 scheduler_Worker-3 ERROR [atlassian.crowd.directory.DbCachingDirectoryPoller] Error occurred while refreshing the cache for directory [ 294915 ].
org.springframework.dao.IncorrectResultSizeDataAccessException: query did not return a unique result: 2
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:666)
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:424)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:339)
at com.atlassian.crowd.dao.membership.MembershipDAOHibernate.findInternalMembership(MembershipDAOHibernate.java:214)
at com.atlassian.crowd.dao.membership.MembershipDAOHibernate.isUserDirectMember(MembershipDAOHibernate.java:78)
at com.atlassian.crowd.directory.AbstractInternalDirectory.isUserDirectGroupMember(AbstractInternalDirectory.java:664)
at com.atlassian.crowd.directory.AbstractInternalDirectory.removeUserFromGroup(AbstractInternalDirectory.java:713)
at com.atlassian.crowd.directory.DbCachingRemoteChangeOperations.removeUserMembershipsForGroup(DbCachingRemoteChangeOperations.java:687)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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.$Proxy195.removeUserMembershipsForGroup(Unknown Source)
at com.atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations.syncUserMembersForGroup(DirectoryCacheImplUsingChangeOperations.java:116)
at com.atlassian.crowd.directory.ldap.cache.UsnChangedCacheRefresher.synchroniseMembershipsForGroup(UsnChangedCacheRefresher.java:109)
at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseMemberships(AbstractCacheRefresher.java:62)
at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseAll(AbstractCacheRefresher.java:36)
at com.atlassian.crowd.directory.ldap.cache.UsnChangedCacheRefresher.synchroniseAll(UsnChangedCacheRefresher.java:219)
at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:652)
at com.atlassian.crowd.manager.directory.DirectorySynchroniserImpl.synchronise(DirectorySynchroniserImpl.java:63)
at com.atlassian.crowd.directory.DbCachingDirectoryPoller.pollChanges(DbCachingDirectoryPoller.java:50)
at com.atlassian.crowd.manager.directory.monitor.poller.DirectoryPollerJobBean.executeInternal(DirectoryPollerJobBean.java:29)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:195)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
Cause
MySQL collation for the Crowd database is set to be case insensitive.
Resolution
Do not use COLLATE utf8_general_ci (e.g. case insensitive). Use COLLATE utf8_bin (e.g. case sensitive) since the Crowd schema has keys on VARCHARs which will cause you issues if you use collation ending in CI. To convert your crowd mysql database to use the proper charset please follow the resolution steps in this page.
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