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* GH-3797: Improve batch processing in the framework Fixes https://github.com/spring-projects/spring-integration/issues/3797 * Handle `Message` items of the `Iterable` payload properly in the `JdbcMessageHandler`. Otherwise, they've been wrapped into an extra `Message` * Produce a single message with a `Collection<Message<?>>` payload in the `AggregatingMessageHandler` when the `getOutputProcessor()` is not an instance of `SimpleMessageGroupProcessor` * Mention these changes in docs * Point to the error handling sample from docs * * Fix language in docs Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>