All threads in a component-scoped thread pool are asynchronous bean daemon threads and have the same lifecycle of the application that created it.
组件范围的线程池中的所有线程都是异步bean守护程序线程，并且具有与创建它的应用程序相同的生命周期。
Thus, some of the threads will make a full trip to the second bean and some will not.
因而，其中一些线程将调用第二个 bean，而有些却不会这样。
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