How do I dynamically instantiate

Person

having a map of constructor arguments?

data class Person(val id: Int, val name: String, val age: Int?)

val args = mapOf("id" to 1, "name" to "Alice")
val newPerson = ???

Already asked this in #getting-started but might be better off here: Hi. I just can't seem to get Kotlin reflection working. I'm looking for a way to manipulate all String properties of an object. Is this possibble with Kotlin reflection?

KType.classifier

will give you that, but it does not have to be a

KClass

, it could be a

KTypeParameter

. There is also

KType.jvmErasure

, which will loose type information though.

Any way to make this code look nicer with Kotlin?

try {
        val field = javaClass.getDeclaredField("mShiftingMode")
        field.isAccessible = true
        field.set(this, enable)
    } catch (e: NoSuchFieldException) {
        e.printStackTrace()
    } catch (e: IllegalAccessException) {
        e.printStackTrace()
    }

I looked into kotlin-reflect, but can’t find a way to make private property public

Unsupported [reference to the synthetic extension property for a Java get/set method]

- but is it possible get KProperty manually for plain Java class?

Can reflection tell me if a KClass is an enum or not? There doesn't seem to be an isEnum method.

Given

class MyClass(val first: String, val second: Int, val third: Boolean = false)

, is there a way to reference the variant of the constructor that would provide

(String, Int) -> MyClass

as

KFunction2<String, Int, MyClass>

?

Given a class definition

class MyClass(val aList: List<String>)

the KParameter.type is

List

. Is it ever possible for

List

to have more than one argument?

Here's an unlikely one. Can I cast an

Any?

object to an arbitrary

KClass

. Here's what I would like to do:

fun Request.bind(modelClass: KClass<*>): Any? {
	return WebForm(this,modelClass).get() as modelClass
}

I'd like to avoid having to type

val person: Person = request.bind(Person::class) as Person

- that's a lot of references to

Person

in a single line of code.

basically I need some details on how such names are encoded in d1 and d2 properties of

@Metadata

How do I find check if a constructor parameter is also a property?

I've a question on

KClass.memberProperties

- the docs say I get a

Collection<KProperty1<T, *>>

, but when I iterate this, the compiler infers

KProperty1<out T, Any?>

, which prevents me from calling

it.get(this)

on it. Anybody know why?

Is there a way to go from a

KProperty1<T, R>

to a

KProperty0<R>

when I have the receiver object (

T

)? I.e., can I "bind" a receiver to a property?

Any kotlin-reflect 1.2.41 users on Windows 10 using stock Windows 10 Defender antivirus not able to build their projects? I've found that recent updates to the Windows 10 Defender antivirus is marking the jar as a trojan. To reproduce, set windows 10 defender as your antivirus and try to run a build that requires kotlin-reflect 1.2.41 as a dependency

is it possible in Kotlin to have a function that take a reified type and do a

is

check on

reified T : Any

at runtime?

nvm I just decided to cast to Bar<Any, Any> and suppress the warning. If there is a better way to handle such a thing please do let me know

How do I check if a member is of a nullable class

so if I want to grab a private member my best bet is to after it via javas reflection api, rather than kotlins, _which is so much nicer Q_Q_

How much of the reflection API is available without depending on kotlin-reflect?

Is there a way to know information of collection?

fun foo(clazz: Class<*>) {
  // 1. How to know clazz is collection?
  // 2. How to know T of Collection<T> is String?
}

fun myFunc() {
  val mySet: HashSet<String> = HashSet()
  foo(mySet::class.java)
}

I am trying to obtain the value of every field in an object, but I am apparently unable to do so. I am doing this:

fun <T : Any> getFieldValues(obj: T): List<Any?> {
    val cls = obj::class
    return cls.memberProperties.map { it.get(obj) }
}

But this does not compile, because I am getting

KClass<out T>

for

cls

. Is there any way to do this in a type-safe manner?

Does anyone know how to get the generic type of List<List<T>>? I'd first have List<List<T>> but parsing that would go to List<T> and then T. But I'm getting null in the second operation

Class.forName("kotlin.reflect.jvm.internal.ReflectionFactoryImpl")

is throwing

java.lang.VerifyError: Bad type on operand stack

, anyone know how to solve this?

When obtaining a

KFunction

via a function reference, how do you resolve an "overload resolution ambiguity"? I am trying to get a

KFunction<String>

for

ResultSet::getString

, but there are two versions of that (

getString(Int)

and

getString(String)

). How do I tell the compiler I want the

Int

version?

reflect_on_lambda_body_.kt

How do I get the value of a

const val

property?

Hi everyone, not sure if this was the right channel but I have a question regarding Kotlin Reflection. I posted the question in Stackoverflow: https://stackoverflow.com/questions/53034830/kotlin-reflection-how-to-know-if-a-kotlin-class-is-marked-with-internal-modif The question: I’m autogenerating code with KotlinPoet and Auto Service. I didn’t find any way to know if an annotated class has “internal” modifier so I can create another class with same modifier. For example:

@MyAnnotation
internal class Car

So I thought using Kotlin Reflection I would be able to get this information but no luck. Any clues on how to do it?

Hi, I update my project to Kotlin 1.3.0 but the same code in 1.2.60 is giving me a error on 1.3.0

[11:53:05 ERROR]: Error occurred while enabling KotlinBukkitAPI v0.1.0-SNAPSHOT (Is it up to date?)
java.lang.IllegalAccessError: tried to access method kotlin.collections.ArraysKt___ArraysJvmKt.copyOfRange([Ljava/lang/Object;II)[Ljava/lang/Object; from class kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Instance
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Instance.call(CallerImpl.kt:217) ~[?:?]
	at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:106) ~[?:?]
	at kotlin.reflect.jvm.internal.KMutableProperty1Impl.set(KProperty1Impl.kt:59) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.dsl.config.KConfig.loadRecursive(ConfigDSL.kt:392) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.dsl.config.KConfig.loadAndSetDefaultR(ConfigDSL.kt:142) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.dsl.config.KConfig.loadAndSetDefault(ConfigDSL.kt:96) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.dsl.config.ConfigDSLKt.loadAndSetDefault(ConfigDSL.kt:63) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.dsl.config.ConfigDSLKt.loadAndSetDefault$default(ConfigDSL.kt:61) ~[?:?]
	at br.com.devsrsouza.kotlinbukkitapi.KotlinBukkitAPI.onEnable(KotlinBukkitAPI.kt:25) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) ~[1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) ~[1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at br.com.devsrsouza.pluginlauncher.Main.lambda$onEnable$0(Main.java:32) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]

Hi, If I have a package (*.kt file) and have only functions declared in it (not any class besides package itself) - is it possible by using reflection to obtain the list of those declared functions? I have tried to do something like this -

val o = object{}
val mm = o.javaClass.declaredMethods

and

val mm = o::class
  val ff = mm.declaredMemberFunctions

but it doesn't return anything. is it possible at all? if so, would the function modifier affect this search (private, public, etc)?