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https://issues.apache.org/jira/browse/MNG-7476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536708#comment-17536708
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ASF GitHub Bot commented on MNG-7476:
-------------------------------------

gnodet commented on code in PR #736:
URL: https://github.com/apache/maven/pull/736#discussion_r872493501


##########
maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoExecutor.java:
##########
@@ -232,7 +237,17 @@ private static class ProjectLock implements AutoCloseable
                 boolean aggregator = mojoDescriptor.isAggregator();
                 acquiredAggregatorLock = aggregator ? 
aggregatorLock.writeLock() : aggregatorLock.readLock();
                 acquiredProjectLock = getProjectLock( session );
-                acquiredAggregatorLock.lock();
+                if ( !acquiredAggregatorLock.tryLock() )
+                {
+                    for ( String s : MessageHelper.formatWarning(
+                            "An aggregator Mojo is already executing in 
parallel build, but aggregator "
+                                    + "Mojos require exclusive access to 
reactor to prevent race conditions. This "
+                                    + "mojo execution will be blocked until 
the aggregator work is done." ) )
+                    {

Review Comment:
   Right, I'll dig it.





> Display a warning when an aggregator mojo is lock other mojos executions
> ------------------------------------------------------------------------
>
>                 Key: MNG-7476
>                 URL: https://issues.apache.org/jira/browse/MNG-7476
>             Project: Maven
>          Issue Type: Improvement
>    Affects Versions: 3.8.5
>            Reporter: Guillaume Nodet
>            Assignee: Guillaume Nodet
>            Priority: Major
>             Fix For: 3.8.6, 3.9.0, 4.0.0-alpha-1, 4.0.0
>
>




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