I am trying to call the following Kotlin function from Java
override fun First(list: LinqList<ElementType>, condition: (ElementType) -> Boolean) : ElementType
like this
int first = list.First(list,(x) -> x == 5);
but i get the following error
Error java: cannot access kotlin.jvm.functions.Function1
class file for kotlin.jvm.functions.Function1 not found
I have tried googling it but i can not find the answer anywhere
Thanks in advance
My problem got fixed when I configured Kotlin compiler and runtime for my Java module with the latest stable version (currently 1.3.30)
Just go to Tools > Kotlin > Configure Kotlin in Project > Android with Gradle and choose your Java module with Single module radio button selected then select your version and OK.
Another Solution:
If you have several modules in your android project, please make sure you have added the below config to every module that uses the kotlin:
Step(1)- Project build.gradle:
// Project build.gradle file.
buildscript {
ext.kotlin_version = '1.3.30'
...
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
Step(2)- Inside each module using kotlin:
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-android'
...
dependencies {
implementation "androidx.core:core-ktx:1.0.1"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
Reference: Add Kotlin to an existing app
Android Studio:
in my case, I have change the signature of the inner function which is making the cause of this exception. try to clean your project and run the app, exception will disappear
Method 1) Search for Function1 in your project file and rename it to First.
Method 2) Search for Function1 in your project file and remove all its occurrences.
Function1 class is part of the Kotlin standard library, so neither of your suggestions is applicable.