springboot服务启动报Unable to start embedded contain
Yeah-小海 人气:0初次接触spring-boot + spring-cloud构建微服务项目,配置好项目后并选择启动类启动时报如下错误:
[main] ERROR org.springframework.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)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
at com.dispatchCenter.main.DispatchCenterApplication.main(DispatchCenterApplication.java:9)
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)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:162)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134)
... 8 common frames omitted
1. 根据报错信息发现是在刷新容器的方法onRefresh中抛出的
为什么是刷新容器的方法呢?相信大家都知道spring-boot是基于spring的扩展,是简化spring配置的一个工具,
至于spring是怎么初始化的在本篇不做概述。我们在这只需要知道
EmbeddedWebApplicationContext extends org.springframework.web.context.support.GenericWebApplicationContext
下面点进去查看EmbeddedWebApplicationContext此类中刷新容器的方法的源码如下:
protected void onRefresh() { super.onRefresh(); --这里就是刷新spring容器的入口 try { this.createEmbeddedServletContainer(); --捕获的是这个方法中的异常 } catch (Throwable var2) { throw new ApplicationContextException("Unable to start embedded container", var2); --这里捕获异常后抛出 } }
2. 接着被捕获异常的方法源码
private void createEmbeddedServletContainer() { EmbeddedServletContainer localContainer = this.embeddedServletContainer; ServletContext localServletContext = this.getServletContext(); if (localContainer == null && localServletContext == null) { EmbeddedServletContainerFactory containerFactory = this.getEmbeddedServletContainerFactory(); --根据报错信息这里抛出的异常 this.embeddedServletContainer = containerFactory.getEmbeddedServletContainer(new ServletContextInitializer[]{this.getSelfInitializer()}); } else if (localServletContext != null) { try { this.getSelfInitializer().onStartup(localServletContext); } catch (ServletException var4) { throw new ApplicationContextException("Cannot initialize servlet context", var4); } } this.initPropertySources(); }
3. 再接着就是抛出异常的根源所在的源码
通过查看源码得出是启动时从beanFactory中找不到所需bean的存在,也就是bean根本没有注册:
protected EmbeddedServletContainerFactory getEmbeddedServletContainerFactory() { String[] beanNames = this.getBeanFactory().getBeanNamesForType(EmbeddedServletContainerFactory.class); --这里通过类型去查询bean,结果发现一个都没有就抛出异常了,当然如果超过一个也会抛出异常 if (beanNames.length == 0) { throw new ApplicationContextException("Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean."); } else if (beanNames.length > 1) { throw new ApplicationContextException("Unable to start EmbeddedWebApplicationContext due to multiple EmbeddedServletContainerFactory beans : " + StringUtils.arrayToCommaDelimitedString(beanNames)); } else { return (EmbeddedServletContainerFactory)this.getBeanFactory().getBean(beanNames[0], EmbeddedServletContainerFactory.class); } }
4. 知道原因了反过去查看代码发现启动类中少写了注解
太粗心大意了
@EnableEurekaServer @SpringBootApplication
5. 还有一种情况需要注意
我们使用注解标注了这个启动类,但是还是提示Cannot resolve symbol *等问题,一定要去检查引包是否正确
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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