Mark Payne created NIFI-8173:
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Summary: Parameter values should consistently allow for Expression
Language
Key: NIFI-8173
URL: https://issues.apache.org/jira/browse/NIFI-8173
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework, Documentation & Website
Reporter: Mark Payne
Assignee: Mark Payne
The User Guide claims that Parameters cannot make use of Expression Language.
And if a processor/controller service uses
{code:java}
context.getProperty(DESCRIPTOR).evaluateAttributeExpresssions().getValue();
{code}
It does, in fact, not evaluate EL.
However, UpdateAttribute uses a different API
(ProcessContext.newPropertyValue(...) ) and in the API it DOES evaluate EL. We
need to be consistent in how we are evaluating (or not) the Expression Language.
We do see use cases where allowing Expression Language within Parameters will
be very useful, so I would lean toward allowing EL to be used. This will
require that the User Guide also be updated to clearly explain the context in
which the EL will be evaluated.
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