Joseph Percivall created NIFI-4720:
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Summary: 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evaluating an attribute is out of date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: Joseph 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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