Spring Integration 4.2 to 4.3 Migration Guide

Outbound Gateway within Chain

Previously, it was possible to specify a reply-channel on an <outbound-gateway> within a <chain>. It was completely ignored; the gateway's reply goes to the next chain element, or to the chain's output-channel if the gateway is the last element. This condition is now detected and disallowed. If you have such configuration, simply remove the reply-channel.