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Fixes: #9416 Issue link: https://github.com/spring-projects/spring-integration/issues/9416 The `MessageBuilderFactory` bean could be used a central place to provide custom `Message` implementation into the application. For example, the `GenericMessage.toString()` can be overridden to remove or mask sensitive information from the payload or headers. * Extract a `BaseMessageBuilder` from the `MessageBuilder` class to simplify a custom `MessageBuilderFactory` implementation * Test and document new feature and its purpose