When using an outbound adapter with a server connection factory
(an inbound adapter 'owns' the connections), the outbound adapter
simply logged exceptions.
There are use cases where flows need to know the exception occurs.
Change the adapter to throw a MessagingException.
Update the 2.1 to 2.2. Migration guide explaining that the
ExpressionEvaluatingRequestHandlerAdvice can be used to restore
2.1 behavior, and trap the exception.
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