https://jspecify.dev/
https://github.com/jspecify/jspecify

https://jspecify.dev/docs/start-here/
https://jspecify.dev/docs/user-guide/

https://jspecify.dev/docs/api/org/jspecify/annotations/package-summary.html

https://jspecify.dev/blog/

2025
JetBrains - Null Safety in Spring Applications With JSpecify and NullAway by Sébastien Deleuze 0:00 of 1:00:10
    https://www.youtube.com/watch?v=otwr0IniwRk
JetBrains - JSpecify: Java Nullness Annotations and Kotlin | David Baker 0:00 of 15:34
    https://www.youtube.com/watch?v=z_IO2_XeW2Q
2023
nipafx - How Project Valhalla And JSpecify Can Kill NPEs 0:00 of 21:53
    https://www.youtube.com/watch?v=Re5HvyUtIJ0
2022
https://engineering.fb.com/2022/11/22/developer-tools/meta-java-nullsafe/