[jira] [Updated] (NIFI-11738) Unexpected NiFi Expression Language (NEL) behavior

["Matthew Clarke (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-11738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthew Clarke updated NIFI-11738:
----------------------------------
    Component/s: Core Framework

> Unexpected NiFi Expression Language (NEL) behavior
> --------------------------------------------------
>
>                 Key: NIFI-11738
>                 URL: https://issues.apache.org/jira/browse/NIFI-11738
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.19.0, 1.20.0, 1.21.0
>            Reporter: Matthew Clarke
>            Priority: Major
>
> When working with properties that support NiFi Expression Language (NEL) containing a combination of valid NEL and escaped NEL, inconsistent evaluation occurs.
> Examples:
> 1. NEL *{"$${key}":"value"}* resolves to *{"${key}":"value"}*  <-- expected
> 2. NEL  *{"$${key}":"${literal('value')}"}* resolves to  *{"$${key}":"value"}* <-- unexpected (failed to evaluate escaped NEL and treated as a literal)
> 3. NEL  *{"${literal('value')}":"$${key}"}* resolves to *{"value":"${key}"}* <-- expected
> 4. NEL *{"${literal('first')}":"$${key}":"${literal('value')}"}* resolves to  *{"first":"${key}":"value"}* <-- expected  (When escaped NEL was preceded by non-escaped NEL, both the Escaped and non-escaped NEL were evaluated correctly)
> 5. NEL  *{${literal('')}"$${key}":"${literal('value')}"}*  resolves to *{"${key}":"value"}* <--expected
> 6. NEL  *{"${literal('$${key}')"}:"${literal('value')}"}*  resolves to  *{"${literal('${key}')"}:"${literal('value')}"}*  <-- unexpected  (here it resolved the escaped NEL inside a valid NEL; however, then treated both valid NEL as literals.)



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