JIRA: https://jira.spring.io/browse/INT-3317 In addition add `AbstractCorrelatingMessageHandler.discardChannelName` for convenience with JavaConfig INT-3317: Add `AbstractCorrMH.outputChannelName` INT-3317: Fix further `BF` population Also add `MessageFilter.discardChannelName` Move `XPathExpressionEvaluatingHeaderValueMessageProcessor` to the `xml.transformer.support` package Additional polishing Polishing PR comments.