Increase the robustness of 
org.apache.james.user.ldap.ReadOnlyUsersLDAPRepository
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                 Key: JAMES-1352
                 URL: https://issues.apache.org/jira/browse/JAMES-1352
             Project: JAMES Server
          Issue Type: Improvement
          Components: UsersStore & UsersRepository
    Affects Versions: 3.0-beta3
            Reporter: Steve Brewin
            Assignee: Steve Brewin
            Priority: Minor
             Fix For: Trunk


org.apache.james.user.ldap.ReadOnlyUsersLDAPRepository obtains its connection 
to the LDAP repository during init() processing and thereafter assumes it to be 
valid. When, as may sometimes temporarily or permanently occur, the connection 
becomes invalid the resulting javax.naming.CommunicationException is propogated 
to the caller and no attempt is made to reestablish the connection. James must 
be restarted to reestablish the connection, which is likely to be unacceptable 
in a production environment.

To correct this, org.apache.james.user.ldap.ReadOnlyUsersLDAPRepository needs 
to be modified in the following ways:

1) Make the connection timeout period configurable
2) Introduce the ability to attempt to reinstate and retry connections a 
configurable number of times with a configurable delay between retries when 
recoverable exception is thrown

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