SpringBoot 启动错误 ---Unable to start ServletWebServerApplicationContext due to missing ServletWebServe

错误提示：

D:\jdk1.8.0_111\bin\java "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.1.4\lib\idea_rt.jar=56644:C:\Program Files\JetBrains\IntelliJ IDEA 2017.1.4\bin" -Dfile.encoding=UTF-8 -classpath D:\jdk1.8.0_111\jre\lib\charsets.jar;D:\jdk1.8.0_111\jre\lib\deploy.jar;D:\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;D:\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;D:\jdk1.8.0_111\jre\lib\ext\dnsns.jar;D:\jdk1.8.0_111\jre\lib\ext\jaccess.jar;D:\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;D:\jdk1.8.0_111\jre\lib\ext\localedata.jar;D:\jdk1.8.0_111\jre\lib\ext\nashorn.jar;D:\jdk1.8.0_111\jre\lib\ext\sunec.jar;D:\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;D:\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;D:\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;D:\jdk1.8.0_111\jre\lib\ext\zipfs.jar;D:\jdk1.8.0_111\jre\lib\javaws.jar;D:\jdk1.8.0_111\jre\lib\jce.jar;D:\jdk1.8.0_111\jre\lib\jfr.jar;D:\jdk1.8.0_111\jre\lib\jfxswt.jar;D:\jdk1.8.0_111\jre\lib\jsse.jar;D:\jdk1.8.0_111\jre\lib\management-agent.jar;D:\jdk1.8.0_111\jre\lib\plugin.jar;D:\jdk1.8.0_111\jre\lib\resources.jar;D:\jdk1.8.0_111\jre\lib\rt.jar;D:\springboot_quick\target\classes;E:\repository\org\springframework\boot\spring-boot-starter-web\2.0.1.RELEASE\spring-boot-starter-web-2.0.1.RELEASE.jar;E:\repository\org\springframework\boot\spring-boot-starter\2.0.1.RELEASE\spring-boot-starter-2.0.1.RELEASE.jar;E:\repository\org\springframework\boot\spring-boot\2.0.1.RELEASE\spring-boot-2.0.1.RELEASE.jar;E:\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.1.RELEASE\spring-boot-autoconfigure-2.0.1.RELEASE.jar;E:\repository\org\springframework\boot\spring-boot-starter-logging\2.0.1.RELEASE\spring-boot-starter-logging-2.0.1.RELEASE.jar;E:\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;E:\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;E:\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;E:\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;E:\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;E:\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;E:\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;E:\repository\org\springframework\spring-core\5.0.5.RELEASE\spring-core-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-jcl\5.0.5.RELEASE\spring-jcl-5.0.5.RELEASE.jar;E:\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;E:\repository\org\springframework\boot\spring-boot-starter-json\2.0.1.RELEASE\spring-boot-starter-json-2.0.1.RELEASE.jar;E:\repository\com\fasterxml\jackson\core\jackson-databind\2.9.5\jackson-databind-2.9.5.jar;E:\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;E:\repository\com\fasterxml\jackson\core\jackson-core\2.9.5\jackson-core-2.9.5.jar;E:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.5\jackson-datatype-jdk8-2.9.5.jar;E:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.5\jackson-datatype-jsr310-2.9.5.jar;E:\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.5\jackson-module-parameter-names-2.9.5.jar;E:\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.1.RELEASE\spring-boot-starter-tomcat-2.0.1.RELEASE.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.29\tomcat-embed-core-8.5.29.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.29\tomcat-embed-el-8.5.29.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.29\tomcat-embed-websocket-8.5.29.jar;E:\repository\org\hibernate\validator\hibernate-validator\6.0.9.Final\hibernate-validator-6.0.9.Final.jar;E:\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;E:\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;E:\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;E:\repository\org\springframework\spring-web\5.0.5.RELEASE\spring-web-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-beans\5.0.5.RELEASE\spring-beans-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-webmvc\5.0.5.RELEASE\spring-webmvc-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-aop\5.0.5.RELEASE\spring-aop-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-context\5.0.5.RELEASE\spring-context-5.0.5.RELEASE.jar;E:\repository\org\springframework\spring-expression\5.0.5.RELEASE\spring-expression-5.0.5.RELEASE.jar com.itheima.MySpringbootApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.1.RELEASE)

2018-10-22 11:53:20.012  INFO 10924 --- [           main] com.itheima.MySpringbootApplication      : Starting MySpringbootApplication on PUN3BI6Z4P0XXWH with PID 10924 (D:\springboot_quick\target\classes started by Administrator in D:\springboot_quick)
2018-10-22 11:53:20.012  INFO 10924 --- [           main] com.itheima.MySpringbootApplication      : No active profile set, falling back to default profiles: default
2018-10-22 11:53:20.042  INFO 10924 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@55040f2f: startup date [Mon Oct 22 11:53:20 CST 2018]; root of context hierarchy
2018-10-22 11:53:20.212  WARN 10924 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
2018-10-22 11:53:20.570 ERROR 10924 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:155) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at com.itheima.MySpringbootApplication.main(MySpringbootApplication.java:14) [classes/:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:204) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    ... 8 common frames omitted

解决办法：提示Application无法获取ServletWebServerFactory实例，首先要注意， 由于Springboot在以往使用Spring都要配置下提供了集成方案，所以最简单的方法就是采用默认的配置，解决方法非常简单，只需在你的启动类中加入@EnableAutoConfiguration，当然你也可以手动配置，如下为自动配置。