Spring ‘documentationPluginsBootstrapper‘ java.lang.NullPointerExcepiton

Spring 版本 2.6.2  spring fox 版本 3.0.3 

启动报错：
Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

问题原因这里不多说，有兴趣的可以看看源码，直接说解决方式。

尝试添加配置方式：

properties  :

spring.mvc.pathmatch.matching-strategy=ANT_PATH_MATCHER

yml:

spring:
    mvc:
        pathmatch:
            matching-strategy: ant_path_matcher

 webconfig（实现了 WebMvcConfigurer 接口） 中已经配置：

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

启动发现还是报错。

webconfig再追加配置：

@Bean
    public WebMvcEndpointHandlerMapping webEndpointServletHandlerMapping(WebEndpointsSupplier webEndpointsSupplier, ServletEndpointsSupplier servletEndpointsSupplier, ControllerEndpointsSupplier controllerEndpointsSupplier, EndpointMediaTypes endpointMediaTypes, CorsEndpointProperties corsProperties, WebEndpointProperties webEndpointProperties, Environment environment) {
        List<ExposableEndpoint<?>> allEndpoints = new ArrayList();
        Collection<ExposableWebEndpoint> webEndpoints = webEndpointsSupplier.getEndpoints();
        allEndpoints.addAll(webEndpoints);
        allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());
        allEndpoints.addAll(controllerEndpointsSupplier.getEndpoints());
        String basePath = webEndpointProperties.getBasePath();
        EndpointMapping endpointMapping = new EndpointMapping(basePath);
        boolean shouldRegisterLinksMapping = this.shouldRegisterLinksMapping(webEndpointProperties, environment, basePath);
        return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, endpointMediaTypes, corsProperties.toCorsConfiguration(), new EndpointLinksResolver(allEndpoints, basePath), shouldRegisterLinksMapping, null);
    }


    private boolean shouldRegisterLinksMapping(WebEndpointProperties webEndpointProperties, Environment environment, String basePath) {
        return webEndpointProperties.getDiscovery().isEnabled()
                && (StringUtils.hasText(basePath)
                || ManagementPortType.get(environment).equals(ManagementPortType.DIFFERENT));
    }

启动之后正常。

这里其实是因为 actuator 的问题引起的。

解决方案来源于：https://github.com/springfox/springfox/issues/3462#issuecomment-1010721223