kriegaex commented on code in PR #210:
URL: 
https://github.com/apache/maven-shade-plugin/pull/210#discussion_r1460311390


##########
src/main/java/org/apache/maven/plugins/shade/mojo/ShadeMojo.java:
##########
@@ -1112,15 +1116,21 @@ private void 
rewriteDependencyReducedPomIfWeHaveReduction(
                     w.close();
                 }
 
-                ProjectBuildingRequest projectBuildingRequest =
-                        new 
DefaultProjectBuildingRequest(session.getProjectBuildingRequest());
-                
projectBuildingRequest.setLocalRepository(session.getLocalRepository());
-                
projectBuildingRequest.setRemoteRepositories(project.getRemoteArtifactRepositories());
+                // Lock critical section to fix MSHADE-467
+                try {

Review Comment:
   I tried synchronising on both project and session, it is not enough. Feel 
free to suggest something better, but after you verified that it works, please. 
I can imagine, that somebody who is more experienced in this code base, Maven 
plugins in general and concurrency in particular, can come up with a better 
solution. But let this one be the benchmark. Before my PR, the bug occurs, now 
it is fixed. A better fix is always welcome.



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