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https://issues.apache.org/jira/browse/MNG-6053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guillaume Boué closed MNG-6053.
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Resolution: Fixed
> Unsafe System Properties copy in MavenRepositorySystemUtils, causing NPEs
> -------------------------------------------------------------------------
>
> Key: MNG-6053
> URL: https://issues.apache.org/jira/browse/MNG-6053
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.3.9
> Environment: Eclipse m2e 1.7
> Reporter: Fred Bricon
> Assignee: Guillaume Boué
> Fix For: 3.5.0
>
>
> This bug has been reported in m2e
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=493871:
> {quote}
> I'm occasionally, not 100% reliably reproducible, but regularly enough (like
> it occurs every now and then, not just once) seeing the error below, in the
> Error Log of Eclipse during workspace rebuilds. This is with M2E 1.7.0. --
> I'm not sure if this is just "annoying" or actually prevents M2E from
> correctly configuring projects (?). Either way, perhaps it would be possible
> to "harden" respective code to prevent this?
> java.lang.NullPointerException
> at java.util.Hashtable.put(Hashtable.java:459)
> at
> org.apache.maven.repository.internal.MavenRepositorySystemUtils.newSession(MavenRepositorySystemUtils.java:133)
> at
> org.apache.maven.internal.aether.DefaultRepositorySystemSessionFactory.newRepositorySession(DefaultRepositorySystemSessionFactory.java:98)
> at
> org.apache.maven.DefaultMaven.newRepositorySession(DefaultMaven.java:352)
> at
> org.eclipse.m2e.core.internal.embedder.MavenImpl.createRepositorySession(MavenImpl.java:309)
> {quote}
> Looking at
> https://github.com/apache/maven/blob/86b656167923923e2e416def4a48303b4e6248fa/maven-aether-provider/src/main/java/org/apache/maven/repository/internal/MavenRepositorySystemUtils.java#L132,
> it seems some system property is null (maybe due to some concurrency issue),
> and given that Hashtable doesn't support null values, then it throws an NPE
> on the put() call
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