今天在启动Spring Boot项目的时候，报了“Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean”错误，导致无法启动Spring Boot，具体错误如下所示：

2018-06-30 09:44:08.781 ERROR 10520 --- [  restartedMain] o.s.boot.SpringApplication               : Application startup failed

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at com.tpyyes.SpringBootWebApplication.main(SpringBootWebApplication.java:8) [classes/:na]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]

at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]

at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.4.2.RELEASE.jar:1.4.2.RELEASE]

Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:189) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:162) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

... 13 common frames omitted

解决方案：

出现上述这种错误是因为我们在SpringBootWebApplication类启动main方法的时候，忘记给SpringBootWebApplication类添加Spring Boot的启动注解了，有两个方式解决这个入口报错问题。

方式一：

@SpringBootApplication
public class SpringBootWebApplication {
	
	public static void main(String[] args) {
		SpringApplication.run(SpringBootWebApplication.class, args);
	}
}

方式二：

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class SpringBootWebApplication {
	
	public static void main(String[] args) {
		SpringApplication.run(SpringBootWebApplication.class, args);
	}
}

thanks！