Use the ECM Services for all new implementations in projects wherever possible.
Classic Connector
The ECM Services replace all Classic Connector functions and provide a new Java API. Currently, some extensions, such as those in Web Client Events or in the Integration Server, may still be easier to implement when the events include the Classic Connector.
UBI
The UBI API is no longer supported and should not be used. It has been completely replaced with the RESTful ECM Services. An end-of-life date has not yet been set, so you do not have to modify existing applications at this time.
COM
COM applications continue to include limits for ACLs and users, so this API should not be used in new projects.
For more information about using COM API methods to search for deleted objects and set them to undeleted, see the iApplication methods SearchUser, SearchGroup, SearchACL and SearchRole in the COM documentation in the Saperion Developer documentation.