Crowd attempts to create a duplicate user if a successfully authenticates with a RemoteCrowdDirectory during synchronisation

2013-10-19 22:54:59,758 WARN  [scheduler_Worker-6]  o.h.e.jdbc.spi.SqlExceptionHelper SQL Error: 2601, SQLState: 23000

2013-10-19 22:54:59,758 ERROR [scheduler_Worker-6]  o.h.e.jdbc.spi.SqlExceptionHelper Cannot insert duplicate key row in object 'dbo.cwd_user' with unique index 'SYS_IDX_SYS_CT_10195_10197'. The duplicate key value is (bhumphreys, 262145).

2013-10-19 22:54:59,758 ERROR [scheduler_Worker-6]  o.h.e.j.batch.internal.BatchingBatch HHH000315: Exception executing batch [could not perform addBatch]

2013-10-19 22:54:59,784 WARN  [scheduler_Worker-6]  c.a.c.u.p.h.b.AbstractBatchProcessor batch failed falling back to individual processing
org.springframework.dao.DataIntegrityViolationException: could not perform addBatch; SQL [insert into cwd_user (user_name, lower_user_name, is_active, created_date, updated_date, first_name, lower_first_name, last_name, lower_last_name, display_name, lower_display_name, email_address, lower_email_address, external_id, directory_id, credential, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not perform addBatch
        at org.springframework.orm.hibernate4.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:138) ~[spring-orm-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at org.springframework.orm.hibernate4.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:680) ~[spring-orm-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:562) ~[spring-orm-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:755) ~[spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724) ~[spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at com.atlassian.stash.internal.crowd.SpringBatchTransactionSupplier.doCommit(SpringBatchTransactionSupplier.java:48) ~[stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.crowd.SpringBatchTransactionSupplier.access$100(SpringBatchTransactionSupplier.java:24) ~[stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.crowd.SpringBatchTransactionSupplier$SynchronizationBatchTransaction.commit(SpringBatchTransactionSupplier.java:90) ~[stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.crowd.TransactionManagerBatchProcessor.commitTransaction(TransactionManagerBatchProcessor.java:82) ~[stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.crowd.TransactionManagerBatchProcessor.afterProcessBatch(TransactionManagerBatchProcessor.java:32) ~[stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.processBatch(AbstractBatchProcessor.java:160) [crowd-persistence-2.7.1-m1.jar:na]
        at com.atlassian.crowd.util.persistence.hibernate.batch.AbstractBatchProcessor.execute(AbstractBatchProcessor.java:133) [crowd-persistence-2.7.1-m1.jar:na]
        at com.atlassian.crowd.dao.user.UserDAOHibernate.addAll(UserDAOHibernate.java:115) [crowd-persistence-hibernate4-2.7.1-m1.jar:na]
        at com.atlassian.stash.internal.crowd.HibernateUserDao.addAll(HibernateUserDao.java:80) [stash-dao-impl-2.9.0-SNAPSHOT.jar:na]
        at com.atlassian.crowd.directory.CachingDirectory.addAllUsers(CachingDirectory.java:97) [crowd-persistence-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.DbCachingRemoteChangeOperations.addUsers(DbCachingRemoteChangeOperations.java:178) [crowd-core-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.$Proxy1544.addUsers(Unknown Source) [na:na]
        at com.atlassian.crowd.directory.DirectoryCacheImplUsingChangeOperations.addOrUpdateCachedUsers(DirectoryCacheImplUsingChangeOperations.java:58) [crowd-core-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.ldap.cache.RemoteDirectoryCacheRefresher.synchroniseAllUsers(RemoteDirectoryCacheRefresher.java:68) [crowd-ldap-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.ldap.cache.AbstractCacheRefresher.synchroniseAll(AbstractCacheRefresher.java:78) [crowd-ldap-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.ldap.cache.EventTokenChangedCacheRefresher.synchroniseAll(EventTokenChangedCacheRefresher.java:71) [crowd-ldap-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.DbCachingRemoteDirectory.synchroniseCache(DbCachingRemoteDirectory.java:998) [crowd-core-2.7.1-m1.jar:na]
        at com.atlassian.crowd.manager.directory.DirectorySynchroniserImpl.synchronise(DirectorySynchroniserImpl.java:75) [crowd-core-2.7.1-m1.jar:na]
        at com.atlassian.crowd.directory.DbCachingDirectoryPoller.pollChanges(DbCachingDirectoryPoller.java:50) [crowd-core-2.7.1-m1.jar:na]
        at com.atlassian.crowd.manager.directory.monitor.poller.DirectoryPollerJobBean.executeInternal(DirectoryPollerJobBean.java:29) [crowd-core-2.7.1-m1.jar:na]
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:113) [spring-context-support-3.2.4.RELEASE.jar:3.2.4.RELEASE]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:223) [quartz-1.8.6.jar:na]
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549) [quartz-1.8.6.jar:na]
        ... 38 frames trimmed
Caused by: org.hibernate.exception.ConstraintViolationException: could not perform addBatch
        ... 63 common frames omitted
Caused by: java.sql.BatchUpdateException: Cannot insert duplicate key row in object 'dbo.cwd_user' with unique index 'SYS_IDX_SYS_CT_10195_10197'. The duplicate key value is (bhumphreys, 262145).
        ... 75 common frames omitted