Does Apache NiFi 1.19.1 or 1.20.0 Have Kotlin in the Software Stack?

[#1]

Does Apache NiFi 1.19.1 or 1.20.0 Have Kotlin in the Software Stack?  And, how can I confirm this?

Thank you

[#2]

As far as I know, there is no Kotlin in the software stack ... but you should wait for an answer from somebody with more experience.

Nevertheless, in the meantime, you can have a look for yourself, as the code is public: https://github.com/apache/nifi

[#3 · Accepted solution]

@davehkd 
 Kotlin is a transitive dependency of OkHttp, so any NiFi component that has a dependency on OkHttp will also include the Kotlin stdlib jars as well. 

The Kotlin version was upgraded to 1.7.20 in Apache NiFi 1.19.0.
https://issues.apache.org/jira/browse/NIFI-10655

This update impacts the following Kotlin jar:

kotlin-stdlib-common-1.7.20.jar
kotlin-stdlib-jdk8-1.7.20.jar
kotlin-stdlib-jdk7-1.7.20.jar
kotlin-stdlib-1.7.20.jar

When NiFi is launched it unpacks are the NiFi nars into the NiFi work directory:
<work path defined in nifi.properties file>/work/nar/extensions/

You can search those unpacked nar's "bundled-dependencies" for the kotlin jars to see all the nars containing components that utilize OkHttp and thus also have the kotlin transitive dependency.

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Thank you,

Matt

[#4]

Thanks so much Matt!  Is this answer that you provided also correct in regards to version 1.20?

Thank you again!

[#5]

@davehkd 

Changes committed to an early version 1.19 will persist into the next version unless a specific closed jiras exists that makes another changes impacting version.  I saw no other newer jiras related to Kotlin version changes at time of this response.

Matt