pvillard31 opened a new pull request #4553:
URL: https://github.com/apache/nifi/pull/4553
…tOfBoundsException
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#### Description of PR
**In the expression language, right now, for the substring function:**
> If the starting index or the ending index is greater than the length of
the Subject or has a value less than 0, this function call will result in an
error.
**I suggest to change this behavior and return an empty string instead.
Reason being that with the current behavior, an UpdateAttribute would fail and
roll back the flow file in the incoming relationship, this could cause back
pressure and completely block the whole flow to be running.**
**It might be worth mentioning it in the migration guide as this changes the
current behavior but I still think this is a reasonable change.**
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