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https://issues.apache.org/jira/browse/MNG-6156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822989#comment-15822989
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Michael Osipov commented on MNG-6156:
-------------------------------------
Just tried the above. It still fails. It think that this is a medation problem
within Maven Resolver. Though, it does provide a locking mechanism, it does
reliably work:
{noformat}
[INFO] ------------------------------------------------------------------------
[DEBUG] Concurrent download of
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom
just finished, skipping download
[INFO] Downloaded:
https://repo.maven.apache.org/maven2/org/webjars/bower/datatables.net-buttons/1.2.4/datatables.net-buttons-1.2.4.pom
(0 B at 0.0 KB/sec)
[ERROR] Failed to execute goal on project module064: Could not resolve
dependencies for project org.example:module064:jar:1.0.0-snapshot: Failed to
collect dependencies at org.webjars.bower:datatables.net-buttons:jar:1.2.4:
Failed to read artifact descriptor for
org.webjars.bower:datatables.net-buttons:jar:1.2.4: Could not transfer artifact
org.webjars.bower:datatables.net-buttons:pom:1.2.4 from/to central
(https://repo.maven.apache.org/maven2):
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom.part.lock
(Zugriff verweigert) -> [Help 1]
[DEBUG] Concurrent download of
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom
just finished, skipping download
[INFO] Downloaded:
https://repo.maven.apache.org/maven2/org/webjars/bower/datatables.net-buttons/1.2.4/datatables.net-buttons-1.2.4.pom
(0 B at 0.0 KB/sec)
[DEBUG] Concurrent download of
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom
just finished, skipping download
[INFO] Downloaded:
https://repo.maven.apache.org/maven2/org/webjars/bower/datatables.net-buttons/1.2.4/datatables.net-buttons-1.2.4.pom
(0 B at 0.0 KB/sec)
[DEBUG] Concurrent download of
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom
just finished, skipping download
[INFO] Downloaded:
https://repo.maven.apache.org/maven2/org/webjars/bower/datatables.net-buttons/1.2.4/datatables.net-buttons-1.2.4.pom
(0 B at 0.0 KB/sec)
[DEBUG] Writing tracking file
C:\Users\mosipov\.m2\repository\org\webjars\bower\datatables.net-buttons\1.2.4\datatables.net-buttons-1.2.4.pom.lastUpdated
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal
on project module064: Could not resolve dependencies for project
org.example:module064:jar:1.0.0-snapshot: Failed to collect dependencies at
org.webjars.bower:datatables.net-buttons:jar:1.2.4
at
org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:221)
at
org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:128)
at
org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:245)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:199)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{noformat}
> Resolving dependencies is not thread-safe
> -----------------------------------------
>
> Key: MNG-6156
> URL: https://issues.apache.org/jira/browse/MNG-6156
> Project: Maven
> Issue Type: Bug
> Components: Artifacts and Repositories
> Affects Versions: 3.3.9
> Reporter: Roland Illig
> Attachments: dependency-list.txt, wagon-not-threadsafe.zip
>
>
> When building a multi-module project in parallel, Maven updates the local
> Maven repository without taking into account that other threads or processes
> might do the same at the same time.
> To reproduce:
> 1. unpack the attached project
> 2. {{mvn dependency:list -U -B -T100}}
> See the attached {{dependency-list.txt}} for an example output.
> First thing to notice is that the dependency is downloaded 100 times. This is
> unexpected, since the Reactor should coordinate all the modules.
> Second thing to notice is that the build fails, since a dependency "cannot be
> found". This is wrong, since the dependency _can_ be found, it's just not
> processed properly.
> I suspect the {{legacy.DefaultWagonManager}} to be the cause of this, since
> the typical error messages are:
> * {{"Downloaded file does not exist: "}}
> * {{"Error copying temporary file to the final destination: "}}
> * {{"*** CHECKSUM FAILED - RETRYING"}}
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