Gateway网关报错Unable to start ServletWebServerApplicationContext due to missing ServletWebServer

港控/mmm° 2024-02-20 09:48 12阅读 0赞

## 问题报错： ##

### 报错1： ###

![8244bbe1ce69402f89cbbfb9db2c41f9.png][]

org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'conversionServicePostProcessor' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: Cannot register bean definition [Root bean: class [org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=conversionServicePostProcessor; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]] for bean 'conversionServicePostProcessor': There is already [Root bean: class [org.springframework.security.config.annotation.web.reactive.WebFluxSecurityConfiguration]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=conversionServicePostProcessor; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/security/config/annotation/web/reactive/WebFluxSecurityConfiguration.class]] bound.
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.registerBeanDefinition(DefaultListableBeanFactory.java:945)
    	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:286)
    	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:144)
    	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120)
    	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
    	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236)
    	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280)
    	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96)
    	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533)
    	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)

### 报错2： ###

![f223e174c501435994018cd32da8e6a0.png][]

org.springframework.http.codec.ServerCodecConfigurer’ that could not be found

##  ##

## 问题分析： ##

这个报错的意思就是说没有找到ServeltWebServer这个bean，而很明显这个bean是关于web的。因此我们就得从这个方向入手。而会出现找不这个bean的，要么就是没有配置上web服务，要么就是没有配置上这个bean，又或者是发生了冲突

## 问题解决： ##

### 普通服务： ###

如果是普通项目的话，基本就是缺少web这个服务。

#### 解决方案1： ####

pom文件配置

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

#### 解决方案2： ####

看你启动类这写入的类是否是一致的

![b397945d205844ac8824723ab877eb04.png][]

#### 解决方案3： ####

是否配置了@SpringBootApplication

![9c10d77aa4b748bc846b2478737bcaf7.png][]

### Gateway网关服务： ###

#### 解决方案1： ####

而对于spring cloud gateway来说是基于webflux而不是web框架。因此导入pom需要导入

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

如果有web的则需要删除该pom坐标。或者引入其他项目含有该pom文件的的时候需要去除该坐标

![5ce735b7b744444b847dd40c3b03d71b.png][]

#### 解决方案2(博主认为最有用的)： ####

实际上以上的方案我都试过，但就是行不通。导入这个webflux后还是会报其他奇怪的错误，通过exclusions关键字来进行去除之后又会报其他错误。这就证明并非这样解决的。

因此直接在配置文件中配置以下即可

spring:
      main:
        web-application-type: reactive

原理：

> `当设置为reactive时，Spring Boot将使用反应式编程模型来构建应用。反应式编程是一种异步编程范式，关注数据流和变化传播。这意味着它可以更好地处理非阻塞I/O，从而提高应用的可伸缩性和响应性。 这种设置通常与Spring WebFlux一起使用，Spring WebFlux是Spring 5.0引入的一个新的反应式Web框架。它可以与传统的Servlet API（通过web-application-type: servlet设置）并存，或者作为一个独立的反应式堆栈运行。 总的来说，web-application-type: reactive的作用是让Spring Boot应用使用反应式编程模型，以提高应用的性能和可伸缩性。`

[8244bbe1ce69402f89cbbfb9db2c41f9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/48a9abfb82524a9ea6cdcd2b2c03c152.png
[f223e174c501435994018cd32da8e6a0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/dcd2de17655a4e2385c4527fc6ea375d.png
[b397945d205844ac8824723ab877eb04.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/013a5297c859473e9ef85074b5f442cd.png
[9c10d77aa4b748bc846b2478737bcaf7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/7583690110384992a1ceffa5cc7dfdd5.png
[5ce735b7b744444b847dd40c3b03d71b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/e7d7fd2f4efb48f889a87c0cdc3b065b.png

Gateway网关报错Unable to start ServletWebServerApplicationContext due to missing ServletWebServer

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