SpringBoot启动报错

org.springframework.context.ApplicationContextException(无法启动Web服务器)
在SpringBoot应用启动的过程中，因为报org.springframework.context.ApplicationContextException
导致应用启动失败

报错信息

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-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at SpringBootDemo1Application.main(SpringBootDemo1Application.java:8) [classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_102]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_102]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_102]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_102]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]
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-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	... 13 common frames omitted

这是因为在应用中使用到了多个该类的对象，而该类的对象通过注解的方式注入到应用中，在注入的过程中因为对象的名称重复导致了该异常通过指定注入对象的名称可以解决这个问题

修改前

@RestController
public class SpringBootDemo1Application {
    /*@RequestMapping注解提供路由信息，它告诉Spring任何来自”/“路径的HTTP请求都应该被映射到home方法。*/
    @RequestMapping
    public String index() {
        return "HelloWorld";
    }
    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemo1Application.class, args);
    }
}

修改后（添加@EnableAutoConfiguration）

@EnableAutoConfiguration
@RestController
public class SpringBootDemo1Application {
    /*@RequestMapping注解提供路由信息，它告诉Spring任何来自”/“路径的HTTP请求都应该被映射到home方法。*/
    @RequestMapping
    public String index() {
        return "HelloWorld";
    }
    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemo1Application.class, args);
    }
}

运行结果

SpringBoot启动报错

原文章出处:https://blog.csdn.net/kye055947/article/details/81007760