Unable to start web server; nested exception is org.springframework.context.ApplicationContextException:

Unable to start web server; nested exception is org.springframework.context.ApplicationContextException 是一个SpringBoot项目启动报错，表示无法启动Web服务器。这个错误通常是由于缺少ServletWebServerFactory bean引起的。解决这个问题的一种方法是手动添加spring-boot-starter-tomcat依赖项，例如：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <version>2.1.5.RELEASE</version>
</dependency>

这个依赖项将提供所需的ServletWebServerFactory bean，以解决启动错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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