CODEWITHSUNDEEP
scalapluginsintellij-idea
Sven Vidak
Sven Vidak

Reputation: 605

IntelliJ Scala configuration issue

So, I downloaded Scala and configured paths, I can run Scala console from terminal, Scala plugin is installed and "hello world" is running...

The problem is that, when I write a "hello world" program:

object First {
   def main(args: Array[String]): Unit = {
      println(12)
   }
}

it says: Cannot resolve symbol println

As I said, I can run this program and it prints out 12... Also, if I create a List or an array it "cannot resolve symbol" but everything runs with no problem at all...

In most cases I've found, there was problem with Java set up, but that's not the case here...

Upvotes: 22

Views: 32792

Answers (6)

larsonmattr
larsonmattr

Reputation: 645

Within File->Project Structure, make sure that there is a scala library in Project Settings\Libraries Or, make sure that you have added scala-compiler.jar, scala-library.jar to your project.

If it is still acting strange, try File->Invalidate Cache/Restart

I had a similar issue with IntelliJ for an SBT project I started, with a correctly installed Scala 2.11 library, etc. Invalidate Cache fixed it so that IntelliJ could find the symbols.

Upvotes: 51

Ken Williams
Ken Williams

Reputation: 23955

I had this problem - it turned out to be caused by me upgrading Java on my Mac, so that my JDK's path (/Library/Java/JavaVirtualMachines/jdk1.8.0_172.jdk/Contents/Home) was no longer valid. I went into my Project Structure settings and updated the path to /Library/Java/Home, then the project could see the proper Java libraries.

enter image description here

Upvotes: 0

hossein
hossein

Reputation: 1

if your version IntelliJ IDEA 2016.3.4

Worksheet configuration error:: Can't find Scala module to run

project structure > Modules > + > new modules > scala > scala

Upvotes: 0

Ting Jia
Ting Jia

Reputation: 307

I have the same issue when I use the idea 15, and fixed it in these 2 steps:

  1. File -> Project Structure -> Libraries -> + -> Scala SDK -> your version -> OK

  2. Maven Projects -> choose your scala project -> Lifecycle -> clean -> compile

Done

Upvotes: 3

ekeyser
ekeyser

Reputation: 605

Don't know if this will help, but it worked with my environment. Navigate to:

File > Project Structure > Modules

Then, when I tried to apply a minor change, I got a message about how the Content Roots was being shared between two different Modules (a conflict). After removing the conflicting Content Root(s) from one of the Modules, IntelliJ started resolving symbols correctly.

You will see Content Roots on the right-hand side of the dialog box under module "Sources" tab.

I have no idea if the conflict in "Content Root" was what kept IntelliJ from resolving symbols, but fixing this error cleared everything up without having to change anything else.

Upvotes: 0

qiubix
qiubix

Reputation: 1332

Ensure, that you have scala-library.jar and scala-compiler in your project libraries.

Then try invalidating cache (File->Invalidate Caches/Restart->Invalidate and Restart).

If it's still not working, try reloading all your maven projects. You can either reimport them manually or go to Maven Projects->Reimport All Maven Projects (blue arrows).

I had similar issue and the last thing worked for me.

I hope it helps :)

Upvotes: 5

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