Is there a difference between ApplicationStartedEvent and ContextStartedEvent?

Hello everyone, I'm DD!

Let me talk about this issue with you today: Is there a difference between ApplicationStartedEvent and ContextStartedEvent?

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Regarding this issue, it is actually the understanding of Spring and Spring Boot event mechanism.

Although Spring Boot is based on Spring, Spring Boot does not directly use the common events defined in Spring, but redefines a batch.

They all inherit from SpringApplicationEvent , and SpringApplicationEvent inherits from ApplicationEvent , SpringApplicationEvent and ContextStartedEvent mentioned in the title are equal.

Therefore, ContextStartedEvent should not be used in Spring Boot.

What are the specific events of Spring Boot, you can see an article written before when 2.0 was released: ["Spring Boot 2.0 New Features (2): New Event ApplicationStartedEvent
》](https://blog.didispace.com/Spring-Boot-2-0-feature-2-ApplicationStartedEvent/)

ApplicationStartingEvent
ApplicationEnvironmentPreparedEvent
ApplicationPreparedEvent
ApplicationStartedEvent <= 新增的事件
ApplicationReadyEvent
ApplicationFailedEvent

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The above is my understanding. If there is something wrong, please point it out in the comment area, learn and advance together!

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