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https://issues.apache.org/jira/browse/RAT-239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192626#comment-16192626
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Jochen Wiedmann commented on RAT-239:
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First of all, thanks for the excellent instructions on how to reproduce this. 
Indeed, I can reproduce it and will look into the issue.



> rat plugin fails in mult-iproject build when subproject has surefire-plugin 
> forkCount=0
> ---------------------------------------------------------------------------------------
>
>                 Key: RAT-239
>                 URL: https://issues.apache.org/jira/browse/RAT-239
>             Project: Apache Rat
>          Issue Type: Bug
>          Components: maven, scan
>    Affects Versions: 0.12
>         Environment: OSX, Linux
>            Reporter: Scott M Stark
>         Attachments: build-output.rtf, build-outputX.rtf
>
>
> We have a project using the apache-rat-plugin:0.12 to verify licenses, and it 
> suddenly started failing with a FileNotFoundException for a subproject file 
> that certainly does exist. I have attached the output from the maven build 
> and build with -X as build-ouput.rtf and build-outputX.rtf respectively.
> One can go into the tck subproject and run the build and rat has no problem 
> processing the file from within that directory.
> After reversing changes to find what the cause was, it came down to the 
> tck/pom.xml use of forkCount=0 in the maven-surefire-plugin configuration. I 
> have know idea why this should affect the rat plugin, but it does. 
> To reproduce the issue:
> 1. git clone https://github.com/eclipse/microprofile-jwt-auth.git
> 2. git checkout tags/ratbug
> 3. mvn clean install
> Changing the forkCount to 1 or higher fixes the FileNotFound problem.



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