GitHub user pvillard31 opened a pull request:

    https://github.com/apache/nifi/pull/401

    NIFI-1832 Allowing expression language in properties with a set of 
allowable values

    At the moment, if a property is defined with a set of allowable values AND 
is supporting expression language, then validation will always fail when the 
expression language value is not matching an allowable value. There are two 
options:
    
    - In the processor, add in the allowable values the expression language 
value that is authorized and let the user knows that the expected value MUST BE 
in this specific attribute.
    
    Example: .allowableValues("A", "B", "C", "${myProcessor.type}")
    Then the incoming flow files must have this attribute (using 
UpdateAttribute before).
    
    - Authorize any input value when expression language is supported for this 
kind of properties.
    
    This PR is a proposition for the second option.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/pvillard31/nifi NIFI-1832

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/nifi/pull/401.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #401
    
----
commit de320a6e9e1370964783016538fe07aa1ae6cb17
Author: Pierre Villard <pierre.villard...@gmail.com>
Date:   2016-05-02T09:57:28Z

    NIFI-1832 Allowing expression language in properties with a set of 
allowable values

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