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https://issues.apache.org/jira/browse/NIFI-11?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952122#comment-15952122
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ASF GitHub Bot commented on NIFI-11:
------------------------------------

GitHub user trixpan opened a pull request:

    https://github.com/apache/nifi/pull/1644

    NIFI-11 - Capture StringIndexOutOfBoundsException to prevent failed e…

    …valuations from disrupting flow
    
    Thank you for submitting a contribution to Apache NiFi.
    
    In order to streamline the review of the contribution we ask you
    to ensure the following steps have been taken:
    
    ### For all changes:
    - [X] Is there a JIRA ticket associated with this PR? Is it referenced 
         in the commit message?
    
    - [X] Does your PR title start with NIFI-XXXX where XXXX is the JIRA number 
you are trying to resolve? Pay particular attention to the hyphen "-" character.
    
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branch (typically master)?
    
    - [X] Is your initial contribution a single, squashed commit?
    
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-Pcontrib-check clean install at the root nifi folder?
    - [X] Have you written or updated unit tests to verify your changes?
    - [X] ~~~If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?~~~
    - [X] ~~~If applicable, have you updated the LICENSE file, including the 
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/trixpan/nifi NIFI-11

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

    https://github.com/apache/nifi/pull/1644.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 #1644
    
----
commit 2e602f05aefee5e6cb99fa405dad887bcb5602c2
Author: Andre F de Miranda <[email protected]>
Date:   2017-04-01T08:12:58Z

    NIFI-11 - Capture StringIndexOutOfBoundsException to prevent failed 
evaluations from disrupting flow

----


> UpdateAttribute should penalize & roll back FlowFiles for which Expression 
> Language fails to evaluate
> -----------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-11
>                 URL: https://issues.apache.org/jira/browse/NIFI-11
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Matt Gilman
>            Assignee: Andre F de Miranda
>            Priority: Minor
>
> For example, if using ${filename:substring(1, 20)} and the filename is only 
> 15 characters, this will throw an Exception, which causes UpdateAttribute to 
> yield and not penalize the FlowFile. Instead, it should catch this Exception 
> and rollback with penalization and NOT yield, as this is a problem with the 
> data, not a problem with the processor's ability to function at this moment.



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