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https://issues.apache.org/jira/browse/MENFORCER-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343134#comment-17343134
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Slawomir Jaranowski commented on MENFORCER-308:
-----------------------------------------------

https://github.com/fabric8io/docker-maven-plugin/issues/1146

> NullPointerException when using enforcer and assembly plugin in same pom.xml
> ----------------------------------------------------------------------------
>
>                 Key: MENFORCER-308
>                 URL: https://issues.apache.org/jira/browse/MENFORCER-308
>             Project: Maven Enforcer Plugin
>          Issue Type: Bug
>          Components: Plugin
>    Affects Versions: 1.4.1, 3.0.0-M1, 3.0.0-M2
>         Environment: Windows 7, JDK 1.8.0_172
>            Reporter: thomas collignon
>            Priority: Major
>         Attachments: error.log
>
>
> Hi,
>  
> I got a problem when a project contain a declaration of maven-enforcer-plugin 
> >= 1.4.1 and maven-assembly-plugin, and I think one dependency with runtime 
> scope.
> I have made a little project who reproduce the case : 
> [https://github.com/tcollignon/maven_reproduce_cases/tree/master/enforcer_and_assembly]
>   => just run _mvn clean install_  and see the error :
>  
> {quote}$ mvn clean install
> [INFO] Scanning for projects...
> [INFO]
> [INFO] ------------------< org.tcollignon:enforcer-assembly 
> >------------------
> [INFO] Building enforcer and assembly reproduce case 1.0.0-SNAPSHOT
> [INFO] --------------------------------[ pom 
> ]---------------------------------
> [INFO]
> [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ enforcer-assembly 
> ---
> [INFO] Deleting 
> D:\java\workspaces\developpement_test\maven_reproduce_cases\enforcer_and_assembly\target
> [INFO]
> [INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-maven-version) @ 
> enforcer-assembly ---
> [INFO]
> [INFO] --- maven-assembly-plugin:3.1.0:single (make-assembly) @ 
> enforcer-assembly ---
> [INFO] Reading assembly descriptor: zip.xml
> [WARNING] Cannot include project artifact: 
> org.tcollignon:enforcer-assembly:pom:1.0.0-SNAPSHOT; it doesn't have an 
> associated file or directory.
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] Total time: 1.092 s
> [INFO] Finished at: 2018-06-21T15:59:17+02:00
> [INFO] 
> ------------------------------------------------------------------------
> [ERROR] Failed to execute goal 
> org.apache.maven.plugins:maven-assembly-plugin:3.1.0:single (make-assembly) 
> on project enforcer-assembly: Execution make-assembly of goal 
> org.apache.maven.plugins:maven-assembly-plugin:3.1.0:single failed.: 
> NullPointerException -> [Help 1]
> [ERROR]
> [ERROR] To see the full stack trace of the errors, re-run Maven with the -e 
> switch.
> [ERROR] Re-run Maven using the -X switch to enable full debug logging.
> [ERROR]
> [ERROR] For more information about the errors and possible solutions, please 
> read the following articles:
> [ERROR] [Help 1] 
> http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
> Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; 
> support was removed in 8.0
> {quote}
>  
> I put in attach the full log in debug mode.
>  
> With a little debug, I can see that on runtime scope dependency this is null 
> : Artifact#getFile, but I don't know why.
>  
> When I try with maven-enforcer-plugin 1.4 it works well.
> I try with other version of maven-assembly-plugin and it doesn't change 
> anything.



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