I m using a java library called Caffeine which is actually f kotlinlang #announcements

I'm using a java library called Caffeine which is actually fairly similar to Guava Caches in syntax. However, I've run into this problem (I'm extremely rusty on Kotlin since I haven't touched it in a year).. so.. how do I solve this? (make it nicer)

`
private val requests: Cache<String, Req> = Caffeine.newBuilder()
            .removalListener<String, Req> { clientOrderID: String?, req: Req?, removalCause: RemovalCause ->
                clientOrderID!!; req!!
                ...
                req.close()
            }
`

with Guava the code would compile without the `?

on the parameters

the reason I added these

where I did was because I refer to these variables several times in the code afterwards. However what I'm asking is if there is a nicer syntax where I can somehow get rid of the

?` on the parameters very strange, my other similar caches built in the same way have no problem accepting non-nullable parameters in
removalListener
- it's just this particular one that is the problem

karelpeeters

12/15/2018, 9:27 AM

Well can those parameters actually be null? What do you want to do in that case?

Dalinar

12/15/2018, 9:53 AM

no, I'm just replacing my old cache library with this new

Caffeine

one and ran into this problem. They shouldn't be

null

as can be seen in the <>

karelpeeters

12/15/2018, 1:14 PM

Is that a Kotlin library?

If so, the author of that library specifically chose those type to be nullable, and that probably means something.

Otherwise, if it's a Java library, just remove the

and you'll be using platform types.

Dalinar

12/15/2018, 2:35 PM

java library.. the reason I added the `?

s was because it wouldn't compile without them. They strange thing is that I have 3 different caches created in this way, but with different types inside <> and 2 of them require the

and the other one doesn't and I really can't see what the difference is. Caffeeine is very syntax-similar to Guava, and when I replaced it with Guava none of them require

?`.. it's a puzzle

karelpeeters

12/15/2018, 3:04 PM

Then there must be an

@Nullable

annotation.

Dalinar

12/15/2018, 3:05 PM

ah I forgot about those, thanks

I will look into it

karelpeeters

12/15/2018, 3:05 PM

And mostly look into why it's there 😒imple_smile:

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