Why do I occasionally get NullPointerException when I access concurrently?

[Chaim]

guava version is 30.1.1-jre
use jdk17

use example: cache.get(id, () -> test.query(id))

i can't understand why it throw NullPointException

[Jonathan Bluett-Duncan]

@ChaimNJ It's most likely because id is sometimes null.

What happens if you ensure that the IDs you pass in are never null?

[Chaim]

@ChaimNJ It's most likely because id is sometimes null.

What happens if you ensure that the IDs you pass in are never null?

Thanks, i will check why id is sometimes null