SpringSource/spring-integration — pull request #485 by garyrussell (2012-06-07 16:42:57+00:00)
Title: INT-2604 Remove Deprecated Header

The IPHeaders.CONNECTION_SEQ was replaced by the
standard sequenceNumber header (when applySequence is true)
in 2.1, in order to facilitate resequencing using the
standard resequencer.

This header was deprecated at that time. It is now
removed.

Users that were relying on this header should set
applySequence to true on the connection factory.

Wiki Updated