Spring Security和Swagger2集成报错

在项目中使用了swagger来方便测试接口，但是事与愿违 ，在项目启动的时候竟然报错了

具体报错代码

RequestMappingHandlerMapping requestMappingHandlerMapping =  applicationContext.getBean(RequestMappingHandlerMapping.class);

报错内容如下：

Method springSecurityFilterChain in org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration required a single bean, but 2 were found:
    - requestMappingHandlerMapping: defined by method 'requestMappingHandlerMapping' in class path resource [org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration.class]
    - swagger2ControllerMapping: defined by method 'swagger2ControllerMapping' in class path resource [springfox/documentation/swagger2/configuration/Swagger2documentationConfiguration.class]

Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springSecurityFilterChain' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw exception; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping' available: expected single matching bean but found 2: requestMappingHandlerMapping,swagger2ControllerMapping

于是根据错误找到了对应的两个类

1.Swagger2documentationConfiguration

代码中显示，返回的PropertySourcedRequestMappingHandlerMapping是继承了RequestMappingHandlerMapping

 @Bean
  public HandlerMapping swagger2ControllerMapping(
      Environment environment,
      documentationCache documentationCache,
      ServiceModelToSwagger2Mapper mapper,
      JsonSerializer jsonSerializer) {
    return new PropertySourcedRequestMappingHandlerMapping(
        environment,
        new Swagger2Controller(environment, documentationCache, mapper, jsonSerializer));
  }

2.DelegatingWebMvcConfiguration

代码中显示返回的也是RequestMappingHandlerMapping

 
    @Bean
    public RequestMappingHandlerMapping requestMappingHandlerMapping() {
        RequestMappingHandlerMapping mapping = createRequestMappingHandlerMapping();
                ......
        }

所以spring在配置文件中加载的时候看到了两个RequestMappingHandlerMapping不知道使用哪一个所以报错了【审判庭加载的时候是按照类型进行加载的】

3.解决办法

1.如果是非maven说模块项目，责把

RequestMappingHandlerMapping requestMappingHandlerMapping =  applicationContext.getBean(RequestMappingHandlerMapping.class);改为

RequestMappingHandlerMapping requestMappingHandlerMapping =  (RequestMappingHandlerMapping )applicationContext.getBean("requestMappingHandlerMapping");

2.如果是多模块项目 责把swagger所在的模块放在Spring Security所在模块之后也可以解决问题