Refer to springboot startup error [extshutdown hook] – ask at the door – blog park
The main reason is package import error
No or wrong web initiator was imported
The processing method is as follows: import the following configuration into the POM file
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.4.4</version>
</dependency>Just run it again
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