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link管理  ›  强制Gradle/Maven刷新缓存并重新从Nexus下载依赖jar包 | 申导
https://www.jackyshen.com/2015/10/18/force-gradle-maven-to-refresh-cache-or-download-dependency-jar-from-nexus/
逆袭的骆驼
5 月前

最近需要搭建一个Nexus私服，完全不能连接外网的那种，各种Jar包都是手动拷过来的，碰到需要gradle和maven强制重新下载依赖的问题。

问题

第一次上传某个jar包（比如junit-4.12.jar）到Nexus上，然后调用 gradle build 可以正确下载到依赖包。但如果手动删掉了本地缓存的jar包(在 ~/.gradle 下)，这时从Nexus的下载过程中断，或者Nexus上暂时不存在这个jar包，那么即使Nexus恢复了正常下载，下次执行 gradle build 时就一直提示不能够找到jar包。 

FAILURE: Build failed with an exception.
- What went wrong:
Could not resolve all dependencies for configuration ':testCompile'.
> Could not find junit:junit:4.12.
  Searched in the following locations:
      http://localhost:8081/nexus/content/groups/public/junit/junit/4.12/junit-4.12.pom
      http://localhost:8081/nexus/content/groups/public/junit/junit/4.12/junit-4.12.jar
  Required by:
      org.codehaus.sonar:example-java-maven:1.0-SNAPSHOT

解决方案
回到自己的工作目录下，带参数执行gradle强制刷新~/.gradle下的文件缓存


1
gradle build --refresh-dependencies


参考 Gradle manual


The –refresh-dependencies option tells Gradle to ignore all cached entries for resolved modules and artifacts. A fresh resolve will be performed against all configured repositories, with dynamic versions recalculated, modules refreshed, and artifacts downloaded.


如果是Maven遇到不能刷新本地依赖的话，需要做两件事情：


  • 到~/.m2下，看看jar包路径是不是带有”.lastUpdated”，有的话就删除之。
    • 

  • 带参数强制刷新mvn build -U
    • 

    另外，如果从Nexus将Jar包删除，或重新上传时(需要设置Configuration->Deployment Policy为Allow Redeploy)，有时需要在Browse Storage中，右键Jar包路径，先”Update Index”再”Expire Cache”。注意这里是刷新Nexus自身的缓存和索引，不是开发目录本地的缓存！
    
      
    
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