懒洋洋

在使用spring-cloud-starter-netflix-eureka-client时，启动项目遇到以下异常：Failed to start bean 'eurekaAutoServiceRegistration'; nested exception is java.lang.NullPointerExceorg.springframework.context.ApplicationContextException: Failed to start bean 'eurekaAutoService

一、异常信息java.lang.RuntimeException: Request cannot be executed; I/O reactor status: STOPPED at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:796) at org.elasticsearch.client.RestClient.performRequest(RestClient.ja

1.问题描述： 前端页面携带参数发起ajax的GET请求，controller层用@ModelAttribute+对象接收，无法接收前端请求和参数；2.异常信息：2021-03-10 14:49:03.467 [http-nio-8082-exec-1] DEBUG [springfox.documentation.spring.web.PropertySourcedRequestMappingHandlerMapping] - Looking up handler method...

说明本文主要是对jdk1.8的HashMap的put方法的源码进行了分析，主要介绍点包括：put操作流程、map初始化、map扩容、链表转红黑树等源码，如若在分析当中有错误，请各位支出，以便更新，谢谢；1.map.put()源码注释/** * Implements Map.put and related methods * * @param hash hash for key * @param key the key * @param valu