kodeva commented on issue #310: [MNG-6843] - Parallel build fails due to missing JAR artifacts in compilePath URL: https://github.com/apache/maven/pull/310#issuecomment-571483072 The usage of cloned MavenSession objects with shallow copy of MavenProject objects is not thread-safe when it comes to parallel builds because the MavenProjects are being modified from multiple threads. See the https://issues.apache.org/jira/browse/MNG-6843 issue. I don't have big insight in maven code and thus yep, this change fixes something while it might be breaking something different not covered by automated tests. And, most probably, there's another better fix for the issue. I'll try to create a project that simulates the issue deterministically and that can be publicly shared.
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