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https://issues.apache.org/jira/browse/NETBEANS-3191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neil C Smith resolved NETBEANS-3191.
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Resolution: Fixed
> NPE on Find Usages and Call Hierarchy
> -------------------------------------
>
> Key: NETBEANS-3191
> URL: https://issues.apache.org/jira/browse/NETBEANS-3191
> Project: NetBeans
> Issue Type: Bug
> Components: java - Refactoring
> Affects Versions: 11.1, 11.2
> Environment: Java: 1.8.0_212; Java HotSpot(TM) 64-Bit Server VM
> 25.212-b10
> Runtime: Java(TM) SE Runtime Environment 1.8.0_212-b10
> System: Windows 10 version 10.0 running on amd64; utf-8; en_US (nb)
> Reporter: Niklas Matthies
> Priority: Major
> Labels: pull-request-available
> Attachments: Example.zip, stacktraces.txt
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Please see the Maven project in the attached Example.zip. To reproduce the
> the issue:
> # Open the project in NetBeans
> # Download the Guava dependency
> # Wait until background scanning etc. has completed
> # In Test1.java, perform Find Usages or Call Hierarchy on the getResult()
> method
> # In the case of Call Hierarchy, the processLine() node must be expanded to
> trigger the error
> # When performing Find Usages after Call Hierarchy, at least under NB 11.1
> the first execution triggers no error, but the results list remains empty,
> however a second execution triggers the exception
> => An Unexpected Exception occurs, see the stacktraces in the attached
> stacktraces.txt
> The necessary condition for the error to occur is apparently that both the
> method in question as well as its caller must be methods overridden from the
> same interface, and that the interface must be defined in a separate jar for
> which there is no NetBeans project present. (That's why I used the Guava
> dependency for the reproducible example project.)
> I first reproduced the issue in NetBeans 11.1 and then was able to reproduce
> it in 11.2-beta1.
> The error is also reproducible with a reset (deleted) cachedir/index.
> I used 11.2-beta1 with the default settings (no imported settings), just with
> nb-javac 1.71 installed.
> Test2.java shows that the error also occurs when the caller and callee
> methods are in different classes, but inherited from the same interface.
> In Test3 and Test4, the calling method is overriden from the base class and
> from a different interface (respectively), which causes the error to NOT
> happen for Call Hierarchy, but it does STILL happen for Find Usages.
> In the Find Usages dialog, "From: LineProcessor" must be selected. The error
> doesn't occur with "From: Test1". The selected scope on the other hand
> doesn't seem to make a difference.
>
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