尝试将tomcat切换为underwow，未显示“ ServletContext set”错误

问题描述

我正在使用spring-boot-starter-web软件包，其中包括Tomcat作为Servlet的默认实现。

据我所知，我需要排除spring-boot-starter-tomcat并启用spring-boot-starter-undertow才能使其正常工作。 （不得不说使用Tomcat应用程序运行良好） 但是，尝试通过以下更改运行它时，我遇到了此类错误：

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcHandlerMappingIntrospector' defined in class path resource [config/SwaggerConfig.class]: Invocation of init method Failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in class path resource [config/SwaggerConfig.class]: Bean instantiation via factory method Failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcHandlerMappingIntrospector' defined in class path resource [config/SwaggerConfig.class]: Invocation of init method Failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in class path resource [config/SwaggerConfig.class]: Bean instantiation via factory method Failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in class path resource [config/SwaggerConfig.class]: Bean instantiation via factory method Failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

Caused by: java.lang.IllegalStateException: No ServletContext set

SwaggerConfig.java：

@Configuration
@EnableSwagger2
public class SwaggerConfig extends WebMvcConfigurationSupport {

    @Bean
    public Docket productApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.withClassAnnotation(RestController.class))
                .paths(regex("/.*"))
                .build();
    }

    @Override
    protected void addResourceHandlers(final ResourceHandlerRegistry registry) {
        registry.addResourceHandler("swagger-ui.html")
                .addResourceLocations("classpath:/meta-inf/resources/");
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/meta-inf/resources/webjars/");
    }
}

我已调试它，发现在org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.resourceHandlerMapping()内部，如果确实是Tomcat，我确实已经初始化了ServletContext，但是当我拥有Undertow时，该变量为null。 org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.resourceHandlerMapping（）

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