使用nacos配置中心管理配置文件时，springcloud程序启动报错，无法找到对应的配置文件（加载到了错误的配置文件）

这里写目录标题

• • 一、场景
  • 二、关键依赖
  • 三、报错信息
  • 四、排查
  • • 1、`bootstrap.yml`配置
    • 2、查看Nacos配置中心
    • 3、重启后程序依旧报错，查看启动日志，发现Nacos加载到了错误的配置文件
    • 4、Debug查看源码，企图弄清楚使用错误应用名的原因
    • 5、找不到使用依赖程序应用名的原因，发现`ConfigurationProperties`的属性可以手动进行配置，进行尝试
  • 五、原因
  • 六、解决
  • 七、Nacos配置文件DataId配置规则
  • 八、备注

一、场景

1、将SpringBoot项目升级为SpringCloud

2、SpringBoot版本从2.1.3.RELEASE升级为2.7.8

3、不使用Nacos配置中心，而是加载本地配置文件时，程序启动正常

4、使用Nacos配置中心，加载到了错误的配置文件，导致程序启动失败

二、关键依赖

	com.alibaba.cloud
	spring-cloud-starter-alibaba-nacos-config
	2021.0.5.0




	com.alibaba.cloud
	spring-cloud-starter-alibaba-nacos-discovery
	2021.0.5.0




	org.springframework.cloud
	spring-cloud-starter-bootstrap
	2.7.8

三、报错信息

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shardingDataSourceConfiguration': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'sharding.jdbc.datasource.driver' in value "${sharding.jdbc.datasource.driver}"
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292)
	at com.xxx.OnlineApp.main(OnlineApp.java:33)
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'sharding.jdbc.datasource.driver' in value "${sharding.jdbc.datasource.driver}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180)
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239)
	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:191)
	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:936)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1332)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	... 17 common frames omitted

四、排查

1、bootstrap.yml配置

server:
  port: 8877 #服务端口号

spring:
  ## 服务名称，默认项目名称
  application:
    name: focallmedia-online-admin-cloud
  profiles:
  	# 这里已将Nacos管理的配置文件加进来了
    include: config,rocketmq,scheduler,shardingDataSource
  main:
    allow-circular-references: true
  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.1.231:8848 #服务注册中心地址
        namespace: focallmedia
        group: dev

      config:
        server-addr: 192.168.1.231:8848 #配置中心地址
        file-extension: properties #指定properties格式的配置
        namespace: focallmedia
        group: dev

2、查看Nacos配置中心

2.1、group和namespace都没有问题，但配置文件的DataId没有添加文件后缀

2.2、调整配置文件DataId

3、重启后程序依旧报错，查看启动日志，发现Nacos加载到了错误的配置文件

日志如下

2023-11-16 10:11:42.892 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common] & group[dev]
2023-11-16 10:11:42.908 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common.properties] & group[dev]
2023-11-16 10:11:42.908 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common-config.properties] & group[dev]
2023-11-16 10:11:42.908 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common-rocketmq.properties] & group[dev]
2023-11-16 10:11:42.908 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common-scheduler.properties] & group[dev]
2023-11-16 10:11:42.924 - [WARN ] - [main] - [c.a.cloud.nacos.client.NacosPropertySourceBuilder - line:87]: Ignore the empty nacos configuration and get it based on dataId[focallmedia-common-shardingDataSource.properties] & group[dev]
2023-11-16 10:13:16.856 - [INFO ] - [main] - [o.s.c.b.c.PropertySourceBootstrapConfiguration - line:109]: Located property source: [BootstrapPropertySource {name='bootstrapProperties-focallmedia-common-shardingDataSource.properties,dev'}, BootstrapPropertySource {name='bootstrapProperties-focallmedia-common-scheduler.properties,dev'}, BootstrapPropertySource {name='bootstrapProperties-focallmedia-common-rocketmq.properties,dev'}, BootstrapPropertySource {name='bootstrapProperties-focallmedia-common-config.properties,dev'}, BootstrapPropertySource {name='bootstrapProperties-focallmedia-common.properties,dev'}, BootstrapPropertySource {name='bootstrapProperties-focallmedia-common,dev'}]

– 从日志上看是加载配置文件时，文件的前缀没有使用当前程序配置的spring.application.name属性

– 加载配置文件使用的前缀focallmedia-common是当前程序pom里边依赖的某个Jar包

– 为什么会使用到Jar包配置的应用名？为什么不使用bootstrap.yml所配置的应用名？Debug查看源码试图找到答案，由于水平太菜，没有找到原因（欢迎大佬留言）

4、Debug查看源码，企图弄清楚使用错误应用名的原因

– 日志是PropertySourceBootstrapConfiguration打印出来的，直接找到这个class进行查看

– 发现加载了错误的配置文件

– 往前查看配置来源

依照程序的执行，最先需要注入配置的确实是focallmedia-common这个依赖，但其他项目也依赖了这个Jar包，为什么启动是正常的？

5、找不到使用依赖程序应用名的原因，发现ConfigurationProperties的属性可以手动进行配置，进行尝试

在bootstrap.yml指定配置文件前缀

至此，程序启动正常

五、原因

Nacos加载的配置文件没有使用spring.application.name所配置的应用名，而是加载到了依赖Jar包的应用名（具体原因不明，欢迎大佬留言）

六、解决

在bootstrap.yml指定配置文件前缀

七、Nacos配置文件DataId配置规则

DataId的规则: $ {prefix}-spring.profile.active.{file-extension}

$ {prefix}: 前缀，默认为spring.application.name的值

$ {spring.profile.active} 当前环境对应的profile（多环境配置）

$ {file-extension} 配置内容的数据格式（文件扩展名）

配置时需要和bootstrap.yml中配置的file-extension属性保持一致，否则不能正常读取

八、备注

该问题在其他springcloud项目上没有出现，就算没有在bootstrap.yml配置的spring.cloud.nacos.config.prefix属性，依旧可以找到nacos配置中心正确的配置文件（该程序也依赖了focallmedia-common）

具体原因不确定