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https://issues.apache.org/jira/browse/SUREFIRE-1373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011237#comment-16011237
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Tibor Digana commented on SUREFIRE-1373:
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[~apache-bugzi...@sebastian-kirsch.org]
[~sebastiankirsch]
The Thread {{maven-surefire-plugin@NotThreadSafe}} has nothing to do with any 
{{threadCount}}.
It is extra Thread. I will check the code if it is really running in parallel 
with parallel tests..

> Tests annotated with @NotThreadSafe are not executed in isolation
> -----------------------------------------------------------------
>
>                 Key: SUREFIRE-1373
>                 URL: https://issues.apache.org/jira/browse/SUREFIRE-1373
>             Project: Maven Surefire
>          Issue Type: Bug
>          Components: Maven Surefire Plugin
>    Affects Versions: 2.20
>            Reporter: Sebastian Kirsch
>            Assignee: Tibor Digana
>
> The [surefire 
> documentation|http://maven.apache.org/components/surefire/maven-failsafe-plugin/examples/fork-options-and-parallel-execution.html]
>  states that 
> bq. you can apply the JCIP annotation @net.jcip.annotations.NotThreadSafe on 
> the Java class of JUnit test (pure test class, Suite, Parameterized, etc.) in 
> order to execute it in single Thread instance. The Thread has name 
> maven-surefire-plugin@NotThreadSafe and it is executed at the end of the test 
> run.
> However, the thread is run in parallel to the other tests being executed, 
> which contradicts the documentation and defeats the purpose of running tests 
> sequentially in a single thread.
> See https://github.com/sebastiankirsch/surefire-nonthreadsafe for a test case.



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