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https://issues.apache.org/jira/browse/NETBEANS-1561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665074#comment-16665074
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Andreas Eckstein commented on NETBEANS-1561:
--------------------------------------------

Additional observation: The occurrence of the NullPointerException can be 
prevented by removing 'requires mod1a' in module-info of mod1b (and editing the 
classes in mod1b so as not to inherit from mod1a, however refactor-move still 
fails without this class inheritance, solely due to 'requires mod1a' being in 
place apparently).

> Refactor-Move in Java Modular Project throws NullPointerException
> -----------------------------------------------------------------
>
>                 Key: NETBEANS-1561
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-1561
>             Project: NetBeans
>          Issue Type: Bug
>          Components: java - Refactoring
>    Affects Versions: Next
>            Reporter: Andreas Eckstein
>            Priority: Major
>         Attachments: testProject1.zip
>
>
> I found a reproducible case of NullPointerException when trying to 
> refactor-move a class. In the attached testProject1, each module contains two 
> classes. In mod1a, class Test1A2.java can be moved to package mod1a.pkg 
> without issue. Trying the same thing in mod1b with Test1B2.java results in an 
> exception. Not sure what triggers this, but simpler projects with less 
> class/module relations seem to work fine.
> Platform:
> Linux x86_64
> openjdk version "11.0.1" 2018-10-16
> NetBeans-dev-incubator-netbeans-linux-882-on-20181025-release.zip
> (I've seen this error since Netbeans 9.0/JDK9)



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