CODEWITHSUNDEEP
javascalaintellij-idea
user5497885
user5497885

Reputation:

IntelliJ Bug: Scala 145, Error:scalac: Scala compiler JARs not found

I try to compile a simple object in IntelliJ:

object Test02 {
    def main(args: Array[String]) {
         println("Hello World"); 
    }
}

I got this message:

Error:scalac: Scala compiler JARs not found (module 'scala02'): 
E:\.ivy2\cache\org.scala-lang\scala-library\jars\scala-library-2.11.8.jar, 
E:\.ivy2\cache\org.scala-lang\scala-compiler\jars\scala-compiler-2.11.8.jar,
E:\.ivy2\cache\org.scala-lang\scala-reflect\jars\scala-reflect-2.11.8.jar

I checked the Project Structure and checked the modules. Modules are located here:

C:/Users/asus1/.ivy2/cache/org.scala-lang/scala-compiler/jars/scala-compiler-2.11.8.jar

How Can I change E: to C:/Users/asus1/ ?
Do I need to move all to E: ?

How people manage when the project and the jar are in different location ?

It seems a big bug of IntellJ ...?

Upvotes: 39

Views: 45954

Answers (11)

user1880022
user1880022

Reputation: 21

I was having the same problem, and the solution posted from IntelliJ Developer solved the problem.

Solution:

IntelliJ IDEA 2023.2.5 (Community Edition) Go to File | Settings | Build, Execution, Deployment Under Compiler, click on Scala Compiler Look for ' Incrementality type:' and select IDEA. Apply and close .

Upvotes: 2

Venkatesh Boya
Venkatesh Boya

Reputation: 604

This could be the issue : You may have multiple maven projects linked/imported in single IntelliJ IDE window and those maven projects are using different Scala compiler versions.

First you will get multiple compiler versions detected issue, then to fix this issue if may have deleted some compiler version folder/jars from .m2 repo.

Solution : Go to maven view/tab --> Unlink maven projects from IntelliJ IDE which are using different versions of Scala , keep only projects which are using same version of Scala

Upvotes: 1

mithunpaul
mithunpaul

Reputation: 3536

Update @Oct 2021: This error means plugin needed an update and was solved by : goto File > Settings (Ctrl+Alt+S, Windows)/Preferences (Mac) > Plugin Search for "scala". Update.

Upvotes: 0

JavAlex
JavAlex

Reputation: 5954

For me, the following solution worked:

Go to Project Settings > Modules > Dependencies, select the Scala SDK, Edit, and correct the path of the Scala JARs:

enter image description here

Upvotes: 0

iammallikarjuna
iammallikarjuna

Reputation: 171

https://www.jetbrains.com/help/idea/invalidate-caches.html

IntelliJ IDEA caches a great number of files, therefore the system cache may become overloaded. Sometimes the caches will never be needed again, for example, if you work with frequent short-term projects.

When you invalidate the cache, IntelliJ IDEA rebuilds all projects ever run in the current version of the IDE.

Clear the system cache 1.From the main menu, select File | Invalidate Caches / Restart.

2.In the Invalidate Caches dialog, select an action. You can invalidate the caches and restart the IDE or just restart the IDE.

This worked for me.

Upvotes: 4

Philip K
Philip K

Reputation: 31

Open File -> Project Structure

Go to Libraries under Project Settings

Click on the minus button on the erroring Scala library

Open an existing Scala class in IntelliJ and you will see the prompt to set up Scala SDK and click on that

Upvotes: 2

Hasan Aslam
Hasan Aslam

Reputation: 799

In the more recent versions of IntelliJ (2020.1.1) at the time of writing this, I was able to solve this problem by removing the Scala SDK configured in the Global Libraries section in IntelliJ and hitting File > Invalid Caches / Restart.

I'm not sure why this solved the issue, perhaps recent versions of the IDE now have automatic detection of Scala compiler JAR files from Maven (which I'm using to build my project).

Upvotes: 14

user5497885
user5497885

Reputation:

SOLVED as Follow:

In project settings, you need to manually add:

  1. JDK Folder

  2. Module and dependencies to JDK AND Scala JAR

  3. In library, Add MANUALLY the JAR of Scala (IntelliJ does not add those JAR. it creates compile issues).

  4. in Global library, check the JAR of scala are same.

There is an option to see the DEBUG in verbose mode:

https://intellij-support.jetbrains.com/hc/articles/207241085

This is very useful.

Upvotes: 5

Varsha
Varsha

Reputation: 1

In IntelliJ, ensure that the external libraries are present. If already present, open library settings and check the path to the jars is not in red. If in red, correct the path to the jars

Upvotes: -1

Orar
Orar

Reputation: 958

Please goto File > Settings (Ctrl+Alt+S, Windows)/Preferences (Mac) > Plugin Search for "scala". Uninstall Scala plugin.. Restart IDE. Reinstall it. Restart IDE and install the plugin. Everything works OK

Upvotes: 56

Eron Wright
Eron Wright

Reputation: 1060

If your project is Gradle-based, one possibility is that the project is looking for Scala libraries in the .m2 cache that don't exist. To confirm, open "Project Structure...", go to "Libraries", and examine the list for "Gradle: org.scala-lang:..." that contain errors related to missing files.

If this is the issue, simply re-import the project from scratch.

Upvotes: 7

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