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https://issues.apache.org/jira/browse/NIFI-4703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294684#comment-16294684
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Pierre Villard commented on NIFI-4703:
--------------------------------------
Hi [~glisignoli],
How did you configure the processor? Where is located the variable you want to
use?
Please remember that expression language is enabled against variables defined
in the variable registry or via java/environment variables. This cannot be used
against attributes from incoming flow files.
> Unable to use EL for Hostname and Port on PutTCP processor
> ----------------------------------------------------------
>
> Key: NIFI-4703
> URL: https://issues.apache.org/jira/browse/NIFI-4703
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.4.0
> Reporter: Gino Lisignoli
> Priority: Minor
> Attachments: PutTCP-EL.xml
>
>
> Although https://github.com/apache/nifi/pull/1361 was merged into master, it
> doesn't seem to function.
> When setting a dynamic port in the PutTCP processor, the processor produces
> the error:
> PutTCP[id=01601006-15cf-1651-ca50-f9597b0f303f]
> PutTCP[id=01601006-15cf-1651-ca50-f9597b0f303f] failed to process session due
> to java.lang.NumberFormatException: For input string: "": For input string: ""
> See attached dataflow
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