Changing username case in LDAP causes external group memberships to disappear

2012-03-23 17:40:50,917 INFO [http-8090-2] [embedded.admin.list.DirectoriesController] sync User directory synchronisation requested: [ LDAP server ], type: [ CONNECTOR ]
2012-03-23 17:40:50,951 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteDirectory] synchroniseCache synchronisation for directory [ 98306 ] starting
2012-03-23 17:40:50,969 INFO [scheduler_Worker-5] [directory.ldap.cache.RemoteDirectoryCacheRefresher] findAllRemoteUsers found [ 6 ] remote users in [ 16ms ]
2012-03-23 17:40:50,982 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] getUsersToAddAndUpdate scanning [ 6 ] users to add or update
2012-03-23 17:40:50,983 WARN [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] getUsersToAddAndUpdate remote username [ CeltY ] casing differs from local username [ celty ]. User details will be kept updated, but the username cannot be updated
2012-03-23 17:40:50,984 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations] addOrUpdateCachedUsers scanned and compared [ 6 ] users for update in DB cache in [ 8ms ]
2012-03-23 17:40:50,985 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations] addOrUpdateCachedUsers synchronised [ 6 ] users in [ 10ms ]
2012-03-23 17:40:50,986 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] deleteCachedUsersNotIn scanned and compared [ 6 ] users for delete in DB cache in [ 1ms ]
2012-03-23 17:40:50,987 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] deleteCachedUsersNotIn scanned for deleted users in [ 2ms ]
2012-03-23 17:40:51,003 INFO [scheduler_Worker-5] [directory.ldap.cache.RemoteDirectoryCacheRefresher] findAllRemoteGroups found [ 2 ] remote groups in [ 16ms ]
2012-03-23 17:40:51,004 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations] addOrUpdateCachedGroups scanning [ 2 ] groups to add or update
2012-03-23 17:40:51,009 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] findGroupsToUpdate scanned and compared [ 2 ] groups for update in DB cache in [ 5ms ]
2012-03-23 17:40:51,011 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations] addOrUpdateCachedGroups synchronized [ 2 ] groups in [ 7ms ]
2012-03-23 17:40:51,017 INFO [scheduler_Worker-5] [atlassian.crowd.directory.DbCachingRemoteChangeOperations] deleteCachedGroupsNotIn scanned and compared [ 2 ] groups for delete in DB cache in [ 5ms ]
2012-03-23 17:40:51,040 INFO [scheduler_Worker-5] [directory.ldap.cache.AbstractCacheRefresher] synchroniseMemberships found [ 0 ] remote user-group memberships, [ 0 ] remote group-group memberships in [ 11ms ]
2012-03-23 17:40:51,048 INFO [scheduler_Worker-5] [directory.ldap.cache.AbstractCacheRefresher] synchroniseMemberships Migrated memberships for [1] of [2] groups
2012-03-23 17:40:51,107 INFO [scheduler_Worker-5] [directory.ldap.cache.AbstractCacheRefresher] synchroniseMemberships found [ 3 ] remote user-group memberships, [ 0 ] remote group-group memberships in [ 58ms ]
2012-03-23 17:40:51,256 ERROR [scheduler_Worker-5] [sf.hibernate.util.JDBCExceptionReporter] logExceptions ERROR: duplicate key value violates unique constraint "cwd_unique_user_membership"
2012-03-23 17:40:51,258 ERROR [scheduler_Worker-5] [sf.hibernate.impl.SessionImpl] execute Could not synchronize database state with session
2012-03-23 17:40:51,282 WARN [scheduler_Worker-5] [persistence.hibernate.batch.AbstractBatchProcessor] processBatch batch failed falling back to individual processing
java.lang.RuntimeException: could not flush session
	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.flushSession(Hibernate2BatchProcessor.java:169)
	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.commitTransaction(Hibernate2BatchProcessor.java:107)
	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.afterProcessBatch(Hibernate2BatchProcessor.java:42)
	at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.processBatch(AbstractBatchProcessor.java:160)
	at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.execute(AbstractBatchProcessor.java:132)
	at com.atlassian.crowd.embedded.hibernate2.HibernateMembershipDao.addAll(HibernateMembershipDao.java:201)
	at com.atlassian.crowd.embedded.hibernate2.HibernateMembershipDao.addAllUsersToGroup(HibernateMembershipDao.java:59)
	at com.atlassian.confluence.user.crowd.CachedCrowdMembershipDao.addAllUsersToGroup(CachedCrowdMembershipDao.java:100)
	at com.atlassian.crowd.directory.CachingDirectory.addAllUsersToGroup(CachingDirectory.java:125)
	at com.atlassian.crowd.directory.DbCachingRemoteChangeOperations.addUserMembershipsForGroup(DbCachingRemoteChangeOperations.java:750)
	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.$Proxy976.addUserMembershipsForGroup(Unknown Source)
	at com.atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations.syncUserMembersForGroup(DirectoryCacheImplUsingChangeOperations.java:116)
	at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseMemberships(AbstractCacheRefresher.java:155)
	at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseAll(AbstractCacheRefresher.java:44)
	at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:619)
	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:199)
	at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:20)
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
Caused by: net.sf.hibernate.exception.ConstraintViolationException: could not insert: [com.atlassian.crowd.embedded.hibernate2.HibernateMembership#294918]
	at net.sf.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:62)
	at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	at net.sf.hibernate.persister.AbstractEntityPersister.convert(AbstractEntityPersister.java:1331)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:472)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:436)
	at net.sf.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java:37)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2447)
	at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2433)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2390)
	at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2259)
	at com.atlassian.crowd.embedded.hibernate2.batch.Hibernate2BatchProcessor.flushSession(Hibernate2BatchProcessor.java:165)
	... 31 more
Caused by: org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "cwd_unique_user_membership"
	at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
	at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
	at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
	at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
	at net.sf.hibernate.impl.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:22)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:462)
	... 38 more