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https://issues.apache.org/jira/browse/NIFI-3125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710012#comment-15710012
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Joseph Witt commented on NIFI-3125:
-----------------------------------
[~wenzowski] are you interested in putting together a PR for the property you'd
like to add support for? We have a contribution guide on the site that is
helpful and we can help you work that. The first one is always the hardest.
Let us know if you'd like to give that a go or if you'd prefer that someone
else tackle it.
> Cannot access custom properties from expression language
> --------------------------------------------------------
>
> Key: NIFI-3125
> URL: https://issues.apache.org/jira/browse/NIFI-3125
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.1.0
> Environment: $ sw_vers
> ProductName: Mac OS X
> ProductVersion: 10.12.1
> BuildVersion: 16B2555
> $ java -version
> java version "1.8.0_112"
> Java(TM) SE Runtime Environment (build 1.8.0_112-b16)
> Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode)
> Reporter: Alec Wenzowski
>
> Given a variable registry property file has been configured
> {code:title=conf/nifi.properties|borderStyle=solid}
> nifi.variable.registry.properties=./conf/service.properties
> {code}
> And it contains one valid key
> {code:title=conf/service.properties|borderStyle=solid}
> nifi.service.api_key=pony_foo
> {code}
> Upon booting nifi and inspecting I see
> {code:title=logs/nifi-app.log|borderStyle=solid}
> 745:2016-11-29 19:12:47,020 INFO [main]
> o.a.nifi.util.FileBasedVariableRegistry Loaded 1 properties from
> './conf/service.properties'
> {code}
> Yet when I configure a {{GetHTTP}} processor with its Username property set
> to the Value $\{nifi.service.api_key\} it issues HTTP requests without
> authentication–the configured HTTP Basic Authentication username of
> `pony_foo` is not used–and behaves as if the $\{nifi.service.api_key\} value
> has not been set.
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