maven下载依赖log4j的1.2.16失败
报错信息如下：
log4j:log4j:pom:1.2.16 failed to transfer from https://maven.aliyun.com/repository/central during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of alimaven has elapsed or updates are forced. Original error: Could not transfer artifact log4j:log4j:pom:1.2.16 from/to alimaven (https://maven.aliyun.com/repository/central): transfer failed for https://maven.aliyun.com/repository/central/log4j/log4j/1.2.16/log4j-1.2.16.pom
Try to run Maven import with -U flag (force update snapshots)
解决步骤：
1.换网
从家里wifi切换到手机热点，有时候网不好，会出问题 （之前没有wifi，一直是用手机热点连着电脑的，下载依赖没有任何问题，今天在家用wifi下载就报错了）
2.换完网后，下载1.2.17可以，但是1.2.16不行，需要删除原来下载失败的1.2.16的文件夹
原因：报错信息中提到
This failure was cached in the local repository and resolution is not reattempted until the update interval of alimaven has elapsed or updates are forced.
之前的尝试中。此故障已缓存在本地存储库中，在alimavin的更新间隔结束或强制更新之前，不会再次尝试解决
是因为之前尝试下载这个依赖，失败了，但是会在local repository 生成一个文件夹，再次下载，就会先去找这个文件夹，需要手动把这个文件夹删除。
3.再次下载，就可以了
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