User Directory Migration throws error

Symptom:

• error thrown in the JIRA UI indicating "'<user>' does not exist"
• repeating the same step will throws random username does not exist

Step to reproduce:

1. install JIRA with internal directory
2. create a new Internal with Delegated Authentication directory
3. migrate the users directory from internal to delegated authentication directory
4. (bug) error thrown in the JIRA UI indicating "'<user>' does not exist"
5. (bug) in the JIRA logs:

   /plugins/servlet/embedded-crowd/directories/migrate/ [embedded.admin.directory.MigrateDirectoryUsersController] User migration failed
   java.lang.RuntimeException: com.atlassian.crowd.exception.UserNotFoundException: User <johndoe> does not exist
           at com.atlassian.crowd.embedded.admin.directory.MigrateDirectoryUsersController$1.doInTransaction(MigrateDirectoryUsersController.java:146)
           ...
   
   Caused by: com.atlassian.crowd.exception.UserNotFoundException: User <johndoe> does not exist
   at com.atlassian.jira.crowd.embedded.ofbiz.OfBizUserDao.findByName(OfBizUserDao.java:85)
   at com.atlassian.jira.crowd.embedded.ofbiz.OfBizDelegatingMembershipDao.addUserToGroup(OfBizDelegatingMembershipDao.java:81)
   at com.atlassian.crowd.directory.AbstractInternalDirectory.addUserToGroup(AbstractInternalDirectory.java:821)
   at com.atlassian.crowd.directory.DelegatedAuthenticationDirectory.addUserToGroup(DelegatedAuthenticationDirectory.java:805)
   at com.atlassian.crowd.manager.directory.DirectoryManagerGeneric.addUserToGroup(DirectoryManagerGeneric.java:757) 
   

6. (bug) username thrown in the error cannot login into JIRA using the password stored in LDAP

To verify:

1. make sure the error is not caused by bug JRA-24889
2. in the JIRA database check if the user does exist correctly in the app_user, cwd_user, cwd_membership. The SQL queries below can be use:

   select * from app_user where lower_user_name='<sample_username>';
   select * from cwd_user where user_name ='<sample_username>';
   select * from cwd_membership where child_name ='<sample_username>';
   select * from cwd_directory;
   

3. Important note: restoring the JIRA's data into a test instance and the problem is not reproducible in the test instance.

Root Cause:
Broken Cache when creating the user in the new directory.