To reproduce, have the following connection folder hierarchy.

 

+ Group 1

     - Group A

     - Group B

+ Group 2

     - Group C

     - Group D

 

Then delete all connections and connection folders on ADServer project. Sync this from ADS to ADServer. Sync this again and you should see the Exception.

 

I think the reason is that in ProjectFileParser, we have code to list and delete all the folders (including the sub folders) of the project. However, in ConnectionManager.deleteConnectionFolder() we iterate into each folder's hierarchy and do a depth-first delete of the hierarchy. This results in some folders being deleted multiple times from Hibernate-session point of view. We might want to try delete each instance only once as a fix.