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https://issues.apache.org/jira/browse/NIFI-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard resolved NIFI-4720.
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Resolution: Won't Do
Removal of variables for NiFi 2.0
> Expression Language guide explanation of order of evaluating an attribute is
> out of date
> ----------------------------------------------------------------------------------------
>
> Key: NIFI-4720
> URL: https://issues.apache.org/jira/browse/NIFI-4720
> Project: Apache NiFi
> Issue Type: Bug
> Components: Documentation & Website
> Reporter: Joe Percivall
> Priority: Minor
>
> In the Expression Language guide, under "Structure of a NiFi Expression"[1],
> it explains the order in which the different sources of attribute values are
> processed but doesn't include recent updates to EL. Essentially, this should
> summarize the resolution precedence stated in the User Guide[2].
> {quote}In this example, the value to be returned is the value of the "my
> attribute" value, if it exists. If that attribute does not exist, the
> Expression Language will then look for a System Environment Variable named
> "my attribute." If unable to find this, it will look for a JVM System
> Property named "my attribute." Finally, if none of these exists, the
> Expression Language will return a null value.{quote}
> [1]
> https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html#structure
> [2]
> https://nifi.apache.org/docs/nifi-docs/html/user-guide.html#Using_Custom_Properties
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