Spring Framework Event Handling
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External
Internal
Overview
One of application context's capabilities is to handle events. The events are by default synchronous, which has a few advantages, one of them being the fact that the listener is able to participated in the publisher's transaction context.
ContextStartedEvent, ContextStoppedEvent, ApplicationListener.
Custom Events .
Threading Consideration
Spring event handling is single threaded and synchronous in nature. If an event is published, until and unless all receivers get the message, the processes are blocked and the flow will not continue.