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https://jira.codehaus.org/browse/WAGON-346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=277264#comment-277264
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nicolas de loof commented on WAGON-346:
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Fixed on 2.x branch, I'll now try to find a workaround on 1.x branch
> LightWeight http wagon not thread-safe
> --------------------------------------
>
> Key: WAGON-346
> URL: https://jira.codehaus.org/browse/WAGON-346
> Project: Maven Wagon
> Issue Type: Bug
> Components: wagon-http-lightweight
> Affects Versions: 1.0
> Environment: maven 3 with Aether
> Reporter: nicolas de loof
>
> Aether (maven3) by default parallelized metadata resolution on 4 threads
> (aether.metadataResolver.threads) and artifacts downloading on 5
> (maven.artifact.threads).
> In such context, Wagon is not used sequentially.
> LightWeightHttpWagon is designed for mono-thread, sequential usage. It rely
> on system properties and on setting/resetting java.net.Authenticator
> singleton.
> The result is that, in some cases (typically : when settings defines many
> repositories with various credentials), credentials may not apply and
> download will fail
> A potential fix is
> - to use Java5 URL.openConnection(Proxy) instead of using system properties
> - to use a shared, singleton java.net.Authenticator that lookup repositories
> to match the requested URL
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