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Fixes: #9455 Issue link: https://github.com/spring-projects/spring-integration/issues/9455 * Add an `IntegrationKeepAlive` infrastructure bean to initiate a long-lived non-daemon thread to keep application alive when it cannot be kept like that for various reason, but has to. * Expose `spring.integration.keepAlive` global property to disable an `IntegrationKeepAlive` auto-startup * Test and document the feature