[jira] [Commented] (NIFI-6127) AttributeExpressionLanguage - 'match' throws NPE when comparison object is a non existing flowfile attribute

["Joseph Witt (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16793845#comment-16793845 ] 

Joseph Witt commented on NIFI-6127:
-----------------------------------

Whoa!  Nice find.  You plan on providing a PR for this [~slyouts]?

> AttributeExpressionLanguage - 'match' throws NPE when comparison object is a non existing flowfile attribute
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-6127
>                 URL: https://issues.apache.org/jira/browse/NIFI-6127
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.8.0
>            Reporter: Steven Youtsey
>            Priority: Major
>
> MatchesEvaluator, line 56 - When the flow file attributes do not contain the attribute specified in the comparison portion of a 'matches' operation, the Pattern.compile(null) throws an NPE.
> Since there is no guarantee that a specified flow file attribute is present, this should simply return BooleanQueryResult(false) if the desired attribute does not exist.



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