Kotlin unresolved reference in IntelliJ

Question

I started off with the tutorial for learning Kotlin in IntelliJ When I tried running the example i e  fun main args  Array lt String gt      println  lol       Execution is suspended with this messageError  5  5  Kotlin  Unresolved reference  println This is the first time I am using IntelliJ I have never worked on a Java project either Am I missing something   Edit I have seen the other question already The answer is not valid for my situation

User · Answer

Sometimes this could happen because you are trying to use a project with incompatible versions of Kotlin plugin in Gradle with plugin in your IDE. Check the versions of org.jetbrains.kotlin.jvm and other Kotlin plugins in build.gradle, and version of installed kotlin plugin in your IDE, and try to make it similar:

User · Answer

Ran into this issue   I had to add the following to my build grade     apply plugin   kotlin-android

User · Answer

If anyone stumbles across this and NEITHER Invalidate Cache or Update Kotlin s Version work    1  First  make sure you can build it from outside the IDE  If you re using gradle  for instance   gradle clean build   If everything goes well   then your environment is all good to work with Kotlin   2  To fix the IDE build  try the following      Project Structure -   Select Module  -  Kotlin -  FIX   As suggested by a JetBrain s member here  https   discuss kotlinlang org t intellij-kotlin-project-screw-up 597

User · Answer

Check and install Android Studio Updates  This fix the problem

User · Answer

Another thing I would like to add is that you need to select View -  Tool Windows -  Gradle before you can run the project using the Gradle   If using the Gradle the project builds and runs normally but using the IntelliJ it doesn t  then this can solve the matter

User · Answer

Happened to me today    My issue was that I had too many tabs open  I didn t know they were open  with source code on them   If you close all the tabs  maybe you will unconfuse IntelliJ into indexing the dependencies correctly

User · Answer

I was too getting this error  but i have solved this using below concept    Restart your intellij idea community edition  After that  go on the right hand corner to set the configuration for java       choose configuration setting for all module  then re-run the code  It will work    This error comes because of not configuring java properly

User · Answer

Simplest Solution   Tools- Kotlin- Configure Kotin in Project  Upvote if found Usefull

User · Answer

I tried everything  clean build folders  run gradle clean build  execute AS invalidate cache x2   reinstall Kotlin plugin  restarting pc    But in the end after doing all this it still didn t work  but doing also removal from project build gradle of this line  apply plugin   kotlin-android-extensions   gradle sync and then re-adding worked

User · Answer

My problem was solved by adding kotlin as follow  presentation gradle  app gradle   apply plugin   com android application   apply plugin   kotlin-android     here  apply plugin   kotlin-android-extensions     and here  android              dependencies               domain gradle  pure kotlin      My error was throw here  because Android Studio create my domain   module as pure Java Module and applied plugin as java  and I used it   in the my presentation module that is a Android Kotlin Module      The Android Studio finds and import the path of package but the incompatibillity   don t allow the build       Just remove apply plugin   java  and swith to kotlin as follow   apply plugin   kotlin     here is  dependencies                    data gradle  apply plugin   com android library   apply plugin   kotlin-android     here  apply plugin   kotlin-android-extensions     and here   android              dependencies              I think that it will be helpfull

User · Answer

Your Intellij IDEA plugin and the Kotlin runtime compiler that you use in the project need to match   For example if IDE plugin is Beta 1  but your Gradle Maven project using M12  you ll have issues exactly as you described     So check that everything lines up   If you still have issues  with some older plugins you need to clear the caches in Intellij IDEA  file menu  Clear Caches and Restart  select option to restart

User · Answer

Sometimes in similar situations  I don t think it is your problem because your case is very simple  it s worth to check kotlin file package   If you have Kotlin file within the same package and put there some classes and missed the package declaration it looks inside the IntelliJ that you have classes in the same package but without definition of package the IntelliJ shows you      Error  5  5  Kotlin  Unresolved reference

User · Answer

A possible solution for standalone Kotlin projects is to include Kotlin standard libs explicitliy inside the root project    To do that in IntelliJ IDEA    press Ctrl Shift A  Search actions or options   type in  Configure kotlin in project  and let it include standard libs for you

User · Answer

I had this issue because the linter was printing that my object was an instance of Foo whereas the compiler couldn t define its type and consider it was an Any object like  It was more complex in my case  the linter show error in below code but the idea is here          class Foo           val bar  Int   0            fun test    Any           return Foo              val foo   test       foo bar     lt -- Linter consider that foo is an Instance of Foo but not the compiler because it s an Any object so it show the error at compilation    To fix it I had to cast my object     val foo   test   as Foo

User · Answer

Had the same with IDEA 14 1 5  Kotlin v 1 0 0-beta-1038-IJ141-17  Kotlin gets its own list entry  like Java  when creating new project  but the only working config was   New   Project   Java    Kotlin  Java    make sure you have Project SDK configured  too  use library  Create   Copy to  lib

User · Answer

Invalidating caches and updating the Kotlin plugin in Android Studio did the trick for me

User · Answer

In my case  it was a misconfigured IntelliJ instance      Project Structure -  SDKs -  Remove and add the Java SDK again

User · Answer

For me  it was due to the project missing Gradle Libraries in its project structure    Just add in build gradle   apply plugin   idea    And then run     gradle idea   After that gradle rebuilds dependencies libraries and the references are recognized

User · Answer

Ok  i ve been here a few times and not entirely sure how or why this happens but reading suggests its a Kotlin JVM mismatch  I have tried a number of things mentioned on this page but not without complete success  This was the sort of symptom the IDE was displaying in the message panel after trying to run tests via the IDE  However the code panel has no red lines indicating that modules can t be found or imported or anything untoward     My project  at time of writing this  is a gradle 4 10 2 kotlin 1 3 project in IntelliJ  IntelliJ IDEA 2018 2 5  Ultimate Edition  Build  IU-182 4892 20  built on October 16  2018   For starters though  I invalidated caches and restarted  Then ran a gradle clean build  After rebuilding the project still no joy  I went into the project settings and noticed the compiler versions were not set to java 8  I set the Compiler Kotlin Target JVM Version and Compiler Java Project Byte Code to 1 8 8  see below   then ran some tests in the IDE and we are back in business  References resolved in my case

User · Answer

I had this problem because I was trying to set up a multiplatform library configurations   I had deleted all the source sets with their dependencies from the  build gradle  file but kept the  common  source set   Native was working fine but the JVM was not able to build and showed your error   In the end  the solution was to not delete the Source set of the JVM neither it s dependencies

[intellij-idea] Kotlin unresolved reference in IntelliJ

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