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* GH-3694: Resolve circular dep in PublisherAnnBPP Fixes https://github.com/spring-projects/spring-integration/issues/3694 * Move check for `PublisherAnnotationBeanPostProcessor` bean into the `SmartInitializingSingleton.afterSingletonsInstantiated()` to break a circular dependency revealed in the `InitializingBean.afterPropertiesSet()` * * Fix unused import