Perfect way to Kotlin annotations processing ??

Hello all. Fairly new to Kotlin, but loving it so far. One area that is causing some consternation is that of JPA/Hibernate and the correct way to do it in Kotlin. All the blogs and articles that I’ve read on the subject appear to contradict each other with regards to whether to use data classes or not; what to put in the constructor; should properties be val or var. Can anyone point me in the direction of a clear and unambiguous example of how JPA/Hibernate entities should be defined in Kotlin? I’m look for the best practice.

Hi, is there a nice kotlin collection function like

filter()

, except it returns a list of the filtered items and a list of the unfiltered items? I need both lists

Why did other languages not incorporate the same system of nullable type to handle nullability like kotlin? It seems so intuitive and obvious to be done in the first place Are there any downsides of this approach that are not immediately obvious?

I am aware of optionals in most functional langugages, but it's not exactly the same

what is the most kotlin idiomatic way to the following, so the code stays clean

I need some help with parsing a ByteArray. I have a byte array that needs to be parsed to usable data. The instructions say to format it with "IEEE-754 32-bit floating point (little Endian)". It also says it has an offset of 0 and length of 4. I'm not sure where to start with this. I have tried a few options but the data is not close to what I expect.

Hey, any documentation reference on how to read configuration parameters from files and reload the app on configuration changes ?

hey people, I try to do a reproducible build with ktor. I mean whenever I want to build a jar file and I didn’t change anything in the source then the jar should be exactly the same. It works for my spring-boot services but not for the ktor services: https://dzone.com/articles/reproducible-builds-in-java could someone achieve this and how ?

Is this file updated? https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md

Is there alternative source with what is changed?

does kotlin have a magic fromString function for use with reflection? I've got a

value: string

and a

KPropoperty1<*, T>

, and I'm certain that the

value

is a `toString()`'d version of

T

and that

T

is a common value type (eg

String

,

Double

, or

enum class

). Is there a handy way for me to convert from my

value

to an instance of the `KProperty`'s return type? I can write the switch but I sorta feel like somebody should've handled this for me. I've got both guava and apache commons on my classpath

anyone know when dokka 0.10.0 is going to be released?

This message was deleted.

Is there any reason Kotlin does not have a native Stack Data Structure?

A question about nomenclature. Is is fair to say that generic functions are made by type parameter before those functions. The objection is that methods in generic classes are also generic functions so they can also be made by type parameter before hosting class. Is it so? Would you call such methods generic functions or rather methods in generic classes?

Anyone use klint or detekt before? Please share your experience/recommendation on which one is better

Is this a known bug? https://javap.yawk.at/#DK2APB/procyon - the constructor call to

LocalSubType

is missing the capture parameter

What’s the kotlin way to do singletons? I know about `object`s but they’re not easy to test, or inject dependencies into ( unless i’m misunderstanding something ).

Is it possible to have an

operator val invoke

property ? The error message seems to suggest its possible but I cant find a way

Modifier 'operator' is not applicable to 'member property without backing field or delegate'

class Foo {
    companion object {
        operator val invoke = {}
    }
}

but should it throw an Exception?

How would you write a Kotlin script that replace all occurrences of a string in a file, overwriting the file i.e. in-place like sed:

$ sed -e 's/find/replace/' -e 's/find/replace/' filename

How does everyone feel about the answer from @yole here? I personally really like using !! when I want to assert that something is not null at that point. https://discuss.kotlinlang.org/t/requirenotnull-or/1562/2

I have a piece of code that looks like this:

fun pairTest(foo: Boolean, bar: Boolean) =
        when (foo to bar) {
            (true to true) -> 1
            (true to false) -> 2
            (false to true) -> 3
            (false to false) -> 4
        }

IntelliJ is saying that I need an else branch here. How come? And is there a better way to do this?

is it possible to write a function to get an enum from a value? I know in Java you would write a static function, but enums in kotlin can't have companion objects. Looking to get the enum associated with

token

here.

internal enum class BencoderTokens(private val token: Byte) {
    INTEGER('i'.toByte()),
    STRING(':'.toByte()),
    LIST('l'.toByte()),
    DICT('d'.toByte()),
    END('e'.toByte())
}

This is my 1st "real" Kotlin project, i.e. source code will be managed through Azure DevOps with Git. When creating a new repository from DevOps, there's a 'Add a .gitignore' field in the dialog with several options. For previous projects, we used to select "VisualStudio" because it's the IDE we used for these projects. However, for a kotlin project, would you select the obvious "kotlin" option? Or the "Gradle" option since the code will be built with it? Or some other option? Thanks in advance!

Has anyone seen this memory leak happening? It's causing an out of memory closure on our Android App every ~2 days or so. https://youtrack.jetbrains.com/issue/KT-34125

How can I clear the kapt cache? I use room and it always generates a dao class that was from another branch. When I delete the generated class it generates it again and then fails the build beause it references classes that do not exist.

today got interesting confusion Method accepting parameter as Any type, and by kotlin syntax definition client invoked this method not with round brackets but with curly brackets, and as type is Any, the syntax and compiler accepted it and method was invoked with closure type, which broke the runtime Is it possible somehow to restrict or avoid such behaviour on compile time level?

What is the easiest way to extend an

Map

? I tried extending

HashMap

but it is final. When I extend

Map

I have to implement all types of body functions like

containsKey

,

containsValue

,

get

,

isEmpty

and properties

entries

,

keys

,

size

and

values