spring boot 报错 Unable to start embedded container;

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想做个rest风格的控制器，简单例子：

@RestController@RequestMapping("/user")public class UserController {@RequestMapping("/{id}")  public User view(@PathVariable("id") Long id){User user = new User();user.setId(id);user.setName("linli");return user;}public static void main(String[] args) {// TODO Auto-generated method stub  SpringApplication.run(UserController.class,args);//System.out.println("sss");}}

启动的时候报错：

  .   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::        (v1.3.1.RELEASE)2015-12-22 09:30:23.579  INFO 3208 --- [           main] controller.UserController                : Starting UserController on IQSZ-D2678 with PID 3208

2015-12-22 09:30:23.582  INFO 3208 --- [           main] controller.UserController                : No active profile set, falling back to default profiles: default2015-12-22 09:30:23.879  INFO 3208 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@12ceb70: startup date [Tue Dec 22 09:30:23 CST 2015]; root of context hierarchy2015-12-22 09:30:24.391  WARN 3208 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 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.2015-12-22 09:30:25.211 ERROR 3208 --- [           main] o.s.boot.SpringApplication               : Application startup failedorg.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:133) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:764) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:357) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1124) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1113) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at controller.UserController.main(UserController.java:28) [classes/:na]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:185) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:158) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]... 8 common frames omitted

报的是无法启动嵌入容器，工厂类不存在。

在类头加上 @EnableAutoConfiguration。就OK了。这个接口看名字是允许自动配置。

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