Failure to find com.ctg.itrdc.cache:ctg-cache:pom

前言

本地打包，需要用到ctg-cache-nclient一个redis连接包，这个远端没有下载不下来，于是复制到对应仓库目录下，选择用IDEA重构maven仓库索引的方式使用此jar包，但是在本地有的情况下，依然选择在远端下载

Failure to find com.ctg.itrdc.cache:ctg-cache:pom:2.7.8 in http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of nexus-aliyun has elapsed or updates are forced

此类问题也是

[ERROR] Failed to execute goal on project efssc: Could not resolve dependencies for project com.eshore:efssc:war:0.0.1-SNAPSHOT: The following artifacts could not be resolved: com.ctg.itrdc.mq:ctg-mq-api:jar:2.7.0, com.ctg.mq:ctg-mq-remoting:jar:2.7.0, com.ctg.mq:ctg-mq-client:jar:2.7.0, com.ctg.mq:ctg-mq-common:jar:2.7.0: Failure to find com.ctg.itrdc.mq:ctg-mq-api:jar:2.7.0 in http://maven.aliyun.com/nexus/content/repositories/central/ was cached in the local repository, resolution will not be reattempted until the update interval of alimaven has elapsed or updates are forced -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

问题

多次尝试后发现，是我反向安装的方式不对；此种方式虽然引入并更新了maven仓库，但实际上maven并不识别此jar包，正确方式应该反向安装，通过命令
参考文章：idea 反向安装jar包到仓库
首先从同事那里获得jar包，注意不要直接放到对应仓库目录，随便选个文件夹，地址栏打开cmd，直接执行此命令，默认会读取setting文件，安装到对应目录

mvn install:install-file -DgroupId=com.ctg.itrdc.cache -DartifactId=ctg-cache-nclient -Dversion=2.7.8 -Dpackaging=jar -Dfile=ctg-cache-nclient-2.7.8.jar

 		<dependency>
			<groupId>com.ctg.itrdc.cache</groupId>
			<artifactId>ctg-cache-nclient</artifactId>
			<version>2.7.8</version>
		</dependency>

常见问题

1. mvn无此命令
   对应的maven环境变量有问题，选择重新配置，如果配置了还不生效，可参考此文章，重建两个变量方式
   Maven 环境变量配置 'mvn' 不是内部或外部命令，也不是可运行的程序或批处理文件

2. 直接手动安装到对应目录
   直接删除对应目录的jar ，空白状态安装
   

3. 安装错误位置，本地可能有多个maven，环境变量一个，idea用的另一个，使用相同目录