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https://issues.apache.org/jira/browse/MWRAPPER-68?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553503#comment-17553503
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Dan Tran commented on MWRAPPER-68:
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I am facing same issue after upgrading to 3.1.1

> MVNW_REPOURL improperly formed distributionUrl
> ----------------------------------------------
>
>                 Key: MWRAPPER-68
>                 URL: https://issues.apache.org/jira/browse/MWRAPPER-68
>             Project: Maven Wrapper
>          Issue Type: Bug
>          Components: Maven Wrapper Jar
>    Affects Versions: 3.1.1
>            Reporter: HumanFund
>            Priority: Major
>
> In Maven Wrapper v3.1.1, Installer::createDist(), file 
> maven-wrapper/src/main/java/org/apache/maven/wrapper/Installer.java, was 
> updated on line 74 to be:
> distributionUrl = new URI( mvnwRepoUrl ).resolve( "/" ).resolve( mvnPath );
> The above update is causing the distributionUrl to be improperly formed based 
> on the MVNW_REPOURL environment variable and the mvnPath which is extracted 
> from the distributionUrl in maven-wrapper.properties, specifically the 
> substring starting with "org/apache/maven".
> The update was introduced in the following commit:
> [https://github.com/apache/maven-wrapper/commit/22a3268def96e5e648aa97a49d9e146e529b7c87#diff-193f3775e6efb0b6ed01219b21272f9eb3861965ce3af3586a0ce8eb153359c0]
> An example of the results are shown below.  Note the "Downloading" URI does 
> not include the entire repo url, only the scheme, host, and port, then the 
> maven path is appended.
> The repo url is getting truncated by the call to resolve( "/" ) on line 74.  
> I do not currently see a purpose for having this call in place.  I made the 
> following update to line 74 and it works fine:
> distributionUrl = new URI( mvnwRepoUrl ).resolve( mvnPath );
> Note that in Maven Wrapper v3.1.0, the distributionUrl was formed simply by 
> appending the maven path to the MVNW_REPOURL:
> distributionUrl = new URI( mvnwRepoUrl + "/" + mvnPath );
> Example output demonstrating issue:
> [exec] [INFO] Apache Maven Wrapper 3.1.1
> [exec] [INFO] Detected MVNW_REPOURL environment variable 
> [http://localhost:8081/repository/repo-maven-apache-org-maven2/]
> [exec] [INFO] Installing Maven distribution 
> /home/myexamplehome/maven/wrapper/dists/apache-maven-3.6.3-bin/cf3cf814
> [exec] [INFO] Downloading 
> [http://localhost:8081/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip]
>  
>  



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