Uwe Geercken created NIFI-4541:
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             Summary: Variables can not be used for connection string in 
RedisConnectionPoolService
                 Key: NIFI-4541
                 URL: https://issues.apache.org/jira/browse/NIFI-4541
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.4.0
         Environment: Fedora 26, Nifi 1.4.0
            Reporter: Uwe Geercken
            Priority: Minor


The controller service RedisConnectionPoolService is not accpting variables for 
the connection string field.

Steps:
1) Create a variable on the Nifi Flow level named "redis.server" with the value 
of "localhost:6379"
2) Create a new controller service on the Nifi Flow level: 
RedisConnectionPoolService
3) As connection string enter "${redis.server}

Result:
When the configuration dialog is closed an error is displayed: 'Connection 
String' is invalid because Connection String cannot be blank

When the value "localhost:6379" is entered directly in the connection string 
field of the service controller, it does work correctly.



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