We have a large Websphere application which is written by a vendor, and JAR files are released to internal support personnel.
It is a hugely complex system and mistakes are made during releases to QA & Production.
I've looked at Artifactory/Maven/Gradle etc. which have a lot of functionality, but none of which we actually require.
No development is done in-house, so it is just a matter of moving the JARS from one environment to another, and provide rollback functionality.
By the way, I am a C/Python programmer just helping out in the app team, so bare with me
"If you always do what you've always done, you will always be where you've always been."