Mikolaj Radwan schrieb:
> Hi,
>
> We have a problem with artifact resolution in maven. We use our own
> artifact repositories, that are set as proxies. Those repositories are
> sometimes down and when we try to build anything then, the build fails
> with the following error:
>
> [INFO] artifact org.apache.maven.plugins:maven-clean-plugin: checking
> for updates from central
> [WARNING] repository metadata for: 'artifact 
> org.apache.maven.plugins:maven-clean-plugin'
> could not be retrieved from repository: central due to an error: Error 
> transferring file
> [INFO] Repository 'central' will be blacklisted
> << Same warnings for other repos >>
> [INFO] 
> ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] The plugin 'org.apache.maven.plugins:maven-clean-plugin' does not 
> exist or no valid version could be found
>
> When the repos are up again, the problem remains. When I look into
> .m2/repository/org/apache/.../maven-clean-plugin I see that there are metadata
> files containing empty version info. Only when we delete those files, the 
> artifacts get
> updated and the build works again.
>
> I tried to reproduce this error and found out, that the problem does not 
> occur when the
> proxies in settings.xml are set to non-existant hosts, but it does when they
> are set to hosts that are down (but resolvable).
>
> Has any of you encountered a similar problem? Is there any solution for that, 
> other
> then removing all metadata files?
>   

Have you tried these?
  mvn -U clean
or
   mvn -up clean

I think this is a known issue that is already being worked on (already
fixed perhaps).

Regards,
Simon


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