due to missing ServletWebServerFactory bean错误之spring boot 不占用端口方式启动

最新推荐文章于 2024-07-16 09:18:57 发布

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最新推荐文章于 2024-07-16 09:18:57 发布

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前言

springcloudalibaba项目启动报错，如下：

[2022-03-15 21:50:46] [INFO ] [com.alibaba.cloud.dubbo.service.DubboGenericServiceFactory:176] -- The Dubbo GenericService ReferenceBeans are destroying...
[2022-03-15 21:50:46] [INFO ] [org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor:307] -- class org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor was destroying!
[2022-03-15 21:50:46] [ERROR] [org.springframework.boot.SpringApplication:826] -- 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:156)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at com.ifly.vvm.ExportApplication.main(ExportApplication.java:27)
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:203)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153)
	... 8 common frames omitted

分析

报这个错，是由于启动的spring项目没有引用

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

解决

我们可以引入spring-boot-starter-web来解决报错问题，但是项目是启动在固定tomcat端口的。
另外，
随着微服务架构的流行，想要启动一个微服务架构项目就要开启好多端口，有时候一台机器上部署的项目多的时候，端口资源就比较紧张了，其实有的微服务组件仅仅只是提供RPC服务，可以不用占用web启动的端口，此时spring boot 不占用web端口的方式就派上用场了，但是spring boot 1.x与spring boot 2.x的配置是有区别的，在使用时一定要注意一下自己所使用的版本

spirngboot 2.x之前（代码方式实现）：

@SpringBootApplication
public class Application {

public static void main(String[] args) {
     new SpringApplicationBuilder().sources(Application.class).web(false).run(args);
  }
}

spinrboot 2.x之前（另外一种代码实现方式）

@Configuration
@EnableAutoConfiguration
public class MyClass{
    public static void main(String[] args) throws JAXBException {
          SpringApplication app = new SpringApplication(MyClass.class);
          app.setWebEnvironment(false);
          ConfigurableApplicationContext ctx = app.run(args);
     }
}

spinrboot 2.x之前（配置方式）

spinrboot 2.x之前（配置方式）

springboot 2.x之后（代码方式）

@SpringBootApplication
public class MyApplication {

public static void main(String[] args) {
      new SpringApplicationBuilder(MyApplication.class)
             .web(WebApplicationType.NONE) // .REACTIVE, .SERVLET
             .run(args);
       }
}