WARN 404 --- [nio-8080-exec-1] o.s.web.servlet.PageNotFound

WARN 404 --- [nio-8080-exec-1] o.s.web.servlet.PageNotFound             : No mapping for GET /swagger-ui.html   Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

给他继承  WebMvcConfigurationSupport  

并重写  ddResourceHandlers方法

@Configuration
@EnableSwagger2
public class SwaggerConfig extends WebMvcConfigurationSupport {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("doc.html")
                .addResourceLocations("classpath:/META-INF/resources/");

        registry.addResourceHandler("swagger-ui.html")
                .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/");
    }
}