I will seek guidance from Management/Product Management/Legal about using jar from https://mvnrepository.com/artifact/org.jetbrains/annotations/13.0 .
So far I have been able to download and recompile open source dependencies - I would need to clear any change with Management/Product Management Legal. There is always the hope that one more google will find source with clearer License details (the java files have license details at the top).
I am a Java Developer - so I could rebuild from source jar (using java 6) + pom then if it works: seek approval from Management/Legal .
Thank you for your time,
(FYI The rest of this email is earlier drafts - which contains little additional information)
My current task is to download/recompile 3rd party open source dependencies, for future use of Kotlin. I will need to report back any difficulty to Management/Product Management.
The https://mvnrepository.com/artifact/org.jetbrains/annotations/13.0 jar is listed internally, there might be precedent for not compiling from source.
I am trying to download/recompile 3rd party open source dependencies, for future use of Kotlin.
I work at Oracle.com 
Maven central is reset so we manage third party libraries. I have been looking for annotations 13 since Thursday. I will need to summarize my findings up the management/product management chain soon enough.
I had already seen:
Which includes pom file and source. (I could rebuild from source jar + pom then if it works: seek approval from Management/Legal) .
I did see the jar internally (compiled 2013)
I was looking for a clean/obvious from vendor/from vendor’s github download.
https://github.com/JetBrains/java-annotations/tags goes back to 16.1
 (Approval goes first to My manager/Product Manager, then to Legal).
 Never sure how much to say about my role:
FYI:I work as Java Developer/Senior Member of Technical Staff (i.e. not very senior) at Oracle on Database Tools(free to download but not open source tools) (I can give you more detail about current role/released products I work on, kotlin is not in current released products I work on).