spring boot 2.6.2解决log4j漏洞

公司版本2.3，因为那个log4j漏洞准备升级2.6.2测试下，记录下出现的问题

高版本不允许循环依赖，如果写的时候不太注意，改的时候也要改很多地方，最后决定添加个配置解决

在bootstrap.yml中添加

spring: 
  main:
    allow-circular-references: true

升级spring boot后，配套的spring cloud,alibaba等框架也要一起升级，会缺少一些依赖导致无法启动

<dependency>
　　<groupId>org.springframework.cloud</groupId>
　　<artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>

如果有关于websocket的模块，也会报错，修改websocket配置类

@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
        //支持原生websocket连接方式
        stompEndpointRegistry.addEndpoint("/ws")
                //.setAllowedOrigins("*") //原代码
                .setAllowedOriginPatterns("*");//跨域
}

最后如果用了knife4j，他也会报错，需要添加配置

spring: 
  mvc:
    pathmatch:
      matching-strategy: ant-path-matcher

但如果同时也引用了spring-boot-starter-actuator依赖，那么还需要注入一个bean

    /**
     * 解决springboot升级到2.6.x之后，与spring-boot-starter-actuator同时使用时，knife4j报错问题
     *
     * @param webEndpointsSupplier        the web endpoints supplier
     * @param servletEndpointsSupplier    the servlet endpoints supplier
     * @param controllerEndpointsSupplier the controller endpoints supplier
     * @param endpointMediaTypes          the endpoint media types
     * @param corsProperties              the cors properties
     * @param webEndpointProperties       the web endpoint properties
     * @param environment                 the environment
     * @return the web mvc endpoint handler mapping
     */
    @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 = shouldRegisterLinksMapping(webEndpointProperties,
                environment, basePath);
        return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, endpointMediaTypes,
                corsProperties.toCorsConfiguration(), new EndpointLinksResolver(allEndpoints, basePath),
                shouldRegisterLinksMapping, null);
    }

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

关联issue地址  https://gitee.com/xiaoym/knife4j/issues/I4JT89

然后就启动成功了，暂时遇到的问题就这些，先记录下