org.springframework.context.ApplicationContextException: Unable to start ServletWebServer bean.

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SpringBoot启动的时候报异常:

Caused by: org.springframework.context.ApplicationContextException:
Unable to start ServletWebServerApplicationContext due to missing
ServletWebServerFactory bean.

添加以下依赖即可：

  <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>9.0.22</version>
  </dependency>