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https://issues.apache.org/jira/browse/CALCITE-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799331#comment-15799331
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Josh Elser commented on CALCITE-1562:
-------------------------------------

http://findbugs.sourceforge.net/ was one of the original sources of confusion.

Looking at some of the source code is also worrisome 
https://github.com/findbugsproject/findbugs/blob/master/findbugs/src/java/edu/umd/cs/findbugs/annotations/CheckForNull.java

A big problem is that the JAR contains no information and I've not had great 
success finding a de-facto explanation. There was an email from a guy who did 
some good digging showing it was (likely) ASLv2. I'll try to find that too.

> Switch com.google.code.findbugs:jsr305 to 
> com.github.stephenc.findbugs:findbugs-annotations
> -------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-1562
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1562
>             Project: Calcite
>          Issue Type: Task
>          Components: core
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.12.0
>
>
> The licensing on com.google.code.findbugs:jsr305 is rather murky. It would be 
> trivial to switch over to using 
> com.github.stephenc.findbugs:findbugs-annotations which is clearly licensed 
> and provides the same functionality.



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