问题描述：

idea无法下载远程仓库jar包，最奇怪的是idea有多个项目，有些项目可以下载，有些项目不行。报错如下：

一开始：

unable to find valid certification path to requested target

Try run Maven import with -U flag (force update snapshots)

重新reload mave项目后：

org.json:json:pom:20160810 failed to transfer from https://********/maven-release/ during a previous attempt.

This failure was cached in the local repository and resolution is not reattempted until the update interval of artifactory-repo has elapsed or updates are forced.

Original error: Could not transfer artifact org.json:json:pom:20160810 from/to artifactory-repo (https://****************/maven-release/):

transfer failed for https://**********************/maven-release/org/json/json/20160810/json-20160810.pom

Try run Maven import with -U flag (force update snapshots)

 删掉本次下载的错误文件后又变成：

 

 

unable to find valid certification path to requested target

Try run Maven import with -U flag (force update snapshots)

通过上面可以知道第二个报错的原因是因为本地已经存在.lastupdate文件引起的。因为删除以后就不报那个错了。

所以可以大概猜出报错原因是因为证书问题。从报错unable to find valid certification path to requested target可以看出来。

于是开始处理证书问题：

在file->settings->Maven->Importing下的VM加上以下代码(下载jar包忽略证书)

-Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true

于是乎问题得到解决。

参考文章：

Maven依赖下载报错 unable to find valid certification path to requested target_maven unable to find valid certification path to r-CSDN博客

idea maven unable to find valid certification path to requested target..._idea unable to find valid certification path to re-CSDN博客