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https://issues.apache.org/jira/browse/NIFI-5145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16475816#comment-16475816
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ASF GitHub Bot commented on NIFI-5145:
--------------------------------------

Github user mattyb149 commented on the issue:

    https://github.com/apache/nifi/pull/2672
  
    I think the invalid scopes thing should be done in a separate Jira, there 
are more than just the ones above (~40 in total) so I think we should tackle 
them all at once, and have this PR just call evaluateAttributeExpressions with 
the empty map. I don't think that's a hack, it emulates the real behavior 
(although the real one has a ValueLookup whose constructor skips flow file 
processing if null).


> MockPropertyValue.evaluateExpressionLanguage(FlowFile) cannot handle null 
> inputs
> --------------------------------------------------------------------------------
>
>                 Key: NIFI-5145
>                 URL: https://issues.apache.org/jira/browse/NIFI-5145
>             Project: Apache NiFi
>          Issue Type: Bug
>            Reporter: Mike Thomsen
>            Assignee: Mike Thomsen
>            Priority: Major
>
> The method mentioned in the title line cannot handle null inputs, even though 
> the main NiFi execution classes can handle that scenario. This forces hack to 
> pass testing with nulls that looks like this:
> String val = flowFile != null ? 
> context.getProperty(PROP).evaluateExpressionLanguage(flowfile).getValue() : 
> context.getProperty(PROP).evaluateExpressionLanguage(new 
> HashMap()).getValue();



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