Detailed explanation of 2 BUG solutions for maven projects in Java

After changing to a new environment, two bugs appeared in the re-imported maven project:

1,

Could 
not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:
2.5 
or 
one 
of

The content is very long, only the first part is intercepted

2、

Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 from 
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 has elapsed or updates are forced. 
Original error: Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 from/to 
nexus (http://maven.aliyun.com/nexus/content/groups/public): maven.aliyun.com。

##The solution is as follows:

1、

（1）

Just delete all the folders under the D:\Repositories\.m2\repository\org\apache\maven\plugins folder

(The default address is C:\User\. m2\repository\org\apache\maven\plugins directory)

(2)

Then right-click the project Maven->Update Project or Alt+F5

2. I took some detours about this. I thought it was a problem with the Alibaba Cloud image configuration. After changing several versions, the result was the same. For example,

<!-- 阿里云镜像 下载配置 -->
     <mirror>
      <id>alimaven</id>
      <mirrorOf>central</mirrorOf>        
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
    </mirror>
<!--      <mirror>
        <id>nexus-aliyun</id>
        <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
    </mirror> -->

Later, it was found out that the reason was because there was already a version that failed to download. You need to find the directory where the file is located and delete it manually

(1)

My existing address is D:\Repositories\.m2\repository\ com, delete the google folder.

(2)

Then right-click the project Maven->Update Project or Alt+F5

The problem is solved.

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