问题描述

在本地运行springboot项目的时候遇到一个问题

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )___ | '_ | '_| | '_ / _` | \ \ \ \
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |___, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.4.RELEASE)

parse data from Nacos error,dataId:gateway-web.yaml,data:null,
java.lang.NullPointerException: null
	at java.base/java.io.Reader.<init>(Reader.java:167) ~[na:na]
	at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:93) ~[na:na]
	at com.alibaba.nacos.client.config.utils.IOUtils.toString(IOUtils.java:33) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.impl.HttpSimpleClient.httpGet(HttpSimpleClient.java:71) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.http.ServerHttpAgent.httpGet(ServerHttpAgent.java:80) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.http.MetricsHttpAgent.httpGet(MetricsHttpAgent.java:48) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.impl.ClientWorker.getServerConfig(ClientWorker.java:234) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.NacosConfigService.getConfigInner(NacosConfigService.java:173) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.nacos.client.config.NacosConfigService.getConfig(NacosConfigService.java:122) ~[nacos-client-1.1.1.jar:na]
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.loadNacosData(NacosPropertySourceBuilder.java:85) ~[spring-cloud-alibaba-nacos-config-2.1.0.RELEASE.jar:2.1.0.RELEASE]
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.build(NacosPropertySourceBuilder.java:75) ~[spring-cloud-alibaba-nacos-config-2.1.0.RELEASE.jar:2.1.0.RELEASE]
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosDataIfPresent(NacosPropertySourceLocator.java:179) ~[spring-cloud-alibaba-nacos-config-2.1.0.RELEASE.jar:2.1.0.RELEASE]
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadApplicationConfiguration(NacosPropertySourceLocator.java:155) ~[spring-cloud-alibaba-nacos-config-2.1.0.RELEASE.jar:2.1.0.RELEASE]
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.locate(NacosPropertySourceLocator.java:88) ~[spring-cloud-alibaba-nacos-config-2.1.0.RELEASE.jar:2.1.0.RELEASE]
	at org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration.initialize(PropertySourceBootstrapConfiguration.java:97) ~[spring-cloud-context-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.applyInitializers(SpringApplication.java:649) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:373) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at com.seckill.GatewayApplication.main(GatewayApplication.java:18) ~[classes/:na]

挺玄学的，项目环境、代码我啥都没修改，前几天还能运行，今天就突然报错，网上找了半天没有解决办法，后面自己尝试了下。。。。。。解决了

解决方案

首先，本地为了配置方便，我将nacos的ip在hosts文件中做了一个映射，如下图

这次，我和之前一样打开项目，准备搬砖，救过就出现了上面的问题，怎么都连接不到nacos，一开始觉得是nacos的问题，也重启nacos了，但是还是不行，后面我就想着把映射改成实际IP试试，结果真解决了。。。。

总结

记录下这个问题，目前还没找到原因，后面找到原因了再更新上来，有知道的小伙伴也欢迎补充下