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* GH-3521: Delayer: schedule release task with TX Fixes https://github.com/spring-projects/spring-integration/issues/3521 There is a race condition when transactional `MessageStore` is used for `DelayHandler`, so the message is not visible for reads until after TX is committed, but a scheduled release task may be already ready after delay * Register a `TransactionSynchronization` with scheduling a releasing task when TX is committed **Cherry-pick to `5.4.x` & `5.3.x`** * Fix language in delayer.adoc Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>