```val buffer = ByteBuffer allocate 4450 ``` intellij says t

Question

```val buffer = ByteBuffer allocate 4450 ``` intellij says the inferred type of this is `val buffer ByteBuffer ByteBuffer ` what does that mean this isn t even valid code when i try to type this out myself the code compiles fine on my machine but <http jitpack io|jitpack io> fails because of a type mismatch what is going on here

Michael de Kaste · Answer

ByteBuffer allocation is probably Java Interrop which is either nullable or not You ll probably have to handle something like `val buffer = ByteBuffer allocate 4450 ` or `val buffer = ByteBuffer allocate 4450 return someFailedReturn`

Michael de Kaste · Answer

can t the type just be ByteBuffer

LastExceed · Answer

shouldnt it be `ByteBuffer ` then

LastExceed · Answer

i updated to kotlin 1 6 20 which just released and now it does show `ByteBuffer ` as expected however jitpack still fails with `Type mismatch inferred type is Buffer but ByteBuffer was expected`

LastExceed · Answer

i am so confused

Sam · Answer

Inferred type is `Buffer` That sounds like something from a different library entirely Is that a typo or is that the exact wording of the error message

LastExceed · Answer

its copypasted from the log i was wondering about this too

Sam · Answer

Are you using any other libraries like ktor or okio

LastExceed · Answer

i am using ktor but i already double checked that i m not using the wrong type its definitely `java nio ByteBuffer` everywhere

ephemient · Answer

you are probably running into a Java version difference somewhere

ephemient · Answer

e g `ByteBuffer clear ` is a method of its `Buffer` supertype on Java 8 and so returns a `Buffer` while there is a specific overload on Java 9+ that returns a `ByteBuffer` instead

ephemient · Answer

it s a pain but unrelated to Kotlin and whatever you re seeing in your IDE

dmitriy.novozhilov · Answer

`T ` is a short form of ` T T ` type

LastExceed · Answer

< ephemient> ah yes that seems to be it thanks < dmitriy novozhilov> thats good to know can you elaboraote or point me to a resource where i can learn more about this

ephemient · Answer

it s internal notation for lower and upper bounds it s not something you can type yourself well not that you can type the platform type yourself either

dmitriy.novozhilov · Answer

< LastExceed> Kotlin documentation Kotlin specification

LastExceed · Answer

thanks

ephemient · Answer

<https youtrack jetbrains com issue KTOR 1398> btw there s supposed to be a ` Xjdk release` coming in Kotlin 1 7 similar to Java s ` release` flag to make it a bit less painful to target older JDKs when building with a newer one