Can't change user's e-mail address if LDAP export is enabled

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.2 CE GA3, 6.1.30 EE GA3, 6.2.10 EE GA1, 7.0.0 M3
• Fix Version/s: 6.2.2 CE GA3 , 6.2.X EE, 7.0.0 M1
• Component/s: Application Security > LDAP, Portal Services
• Labels:
  • liferay-fixpack-platform-21-6210
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 10
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/18666

Steps to reproduce

1. Setup LDAP connection to an LDAP server and use (mail=@email_address@) as auth search filter
2. Enable LDAP authentication in portal
3. Enable LDAP export
4. Login with the administrator user ([e-mail] for default login)
5. Create a user
6. Change the e-mail address of the user

With debugging the process, at a point the following LDAP request can be observed:

javax.naming.NameAlreadyBoundException: [LDAP: error code 68 - ENTRY_ALREADY_EXISTS: failed for MessageType : ADD_REQUEST
Message ID : 29
    Add Request :
Entry
    dn[n]: uid=testuser,dc=example,dc=com
    objectclass: top
    objectclass: person
    objectclass: inetOrgPerson
    objectclass: organizationalPerson
    uid: testuser
    mail: [e-mail]
    sn: Test
    title: Developer
    cn: Test User
    givenName: Vilmos
: ERR_250_ENTRY_ALREADY_EXISTS uid=testuser,dc=example,dc=com already exists!]; remaining name 'uid=testuser,dc=example,dc=com'