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https://issues.apache.org/jira/browse/MNG-6929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140469#comment-17140469
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Robert Scholte commented on MNG-6929:
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https://builds.apache.org/job/maven-box/job/maven/job/MNG-6929/2/testReport/org.apache.maven.it/
shows some unrelated failures, that need to be analyzed first.
> Maven Wrapper creates empty file when it fails behind proxy 407
> ---------------------------------------------------------------
>
> Key: MNG-6929
> URL: https://issues.apache.org/jira/browse/MNG-6929
> Project: Maven
> Issue Type: Bug
> Components: maven wrapper
> Environment: Proxy with authentication, http_proxy set without
> authentication
> Reporter: Benjamin Marwell
> Assignee: Robert Scholte
> Priority: Major
> Fix For: 3.7.0
>
>
> Hi,
>
> when executing `{color:#0747a6}{{./mvnw}}{color}` behind a proxy and the
> proxy authentication does not succeed, {color:#0747a6}{{wget}}{color} will
> still create an empty file {color:#0747a6}{{.mvn/maven-wrapper.jar}}{color}.
>
> Subsequent calls to {color:#0747a6}{{./mvnw}}{color} will see the existing
> (but empty) file and maven-wrapper will not attempt to redownload it. There
> is no clue what is going wrong, the only message is "Main class not found".
>
> Suggested fixes:
> * Check curl/wget return codes and delete the files if they got touched.
> * Even if curl/wget were not invoked, delete empty files.
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