I tried to run scala app in IJ community version 2018.3.6, and ran into this error:
Error:scalac: Multiple 'scala-library*.jar' files (scala-library-2.12.8.jar, scala-library-2.12.8.jar) in Scala compiler classpath in Scala SDK sbt: org.scala-lang:scala-library:2.12.8:jar
and I checked hte .idea/libraries folder saw:
sbt__org_scala_lang_scala_library_2_11_8.jar.xml
sbt__org_scala_lang_scala_library_2_12_8.jar.xml
after I delete sbt__org_scala_lang_scala_library_2_11_8.jar.xml still got the same error, then i deleted all 2.11.8 scala*.files still got hte same error
I also tried to open the same project in IJ community version 2019.2.4, it complained:
Cannot determine module type ("SBT_MODULE") for the following module:
there is no 'sbt' tool listed in Preference -> Build, Execution, Deployment -> Build Tools
anyone know how to get it work?
## FIX
i ended up to uninstall and reinstall Scala plugin in IJ 2019.2.4 to get it working again.
Related
I am trying to compile the scala/Play framework example application on my local machine, but I am getting compilation errors when trying to compile using the SBT console in IntelliJ:
error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
I also got this message in the event log related to different SBT versions:
14:48 Started sbt shell with sbt version 0.13.18 instead of 0.13.11 configured by project.
Update sbt version
Disable version override
Any suggestions on how to fix this?
For the first error
error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
You might want to try and ensure that you are using a compatible java version. Like #cbley suggested, try making you are using version 8 of the JDK.
For the second error
14:48 Started sbt shell with sbt version 0.13.18 instead of 0.13.11 configured by project.
Update sbt version
Disable version override
Its just suggesting you update the version of sbt (which is most likely declared in your build.properties file in a folder called project. You can just search for it by double tapping shift in IntelliJ. But you are safe to ignore it if you cloned some example repository as well.
check
I just set up a Scala project in Eclipse (Oxygen 4.7.3a, on Ubuntu 18.04) with the Scala-IDE plugin (4.7.0.v-2_12-201709291352-71a28d0) with a simple HelloWorld object. If I set "Properties -> Scala Compiler" to 2.12 everything works as expected: the project compiles and runs. But if I choose any other version (for instance, "Latest 2.10 bundle (dynamic)" I get prompted to do a full rebuild (as expected) but when I go to "Project -> Build" nothing happens. If I have errors in my code, the editor underlines them, but they won't show in "Problems". If I try to run it I get a class not found error.
I get the feeling that it is not actually compiling. Any ideas on what I need to configure differently?
I finally solved it by removing openjdk-11 and installing openjdk-8. After doing that and reinstalling Eclipse and Scala-IDE everything works fine.
It would have been helpful having some feedback from Eclipse regarding what was not working. I figured it out because I tried to build with SBT and the error lead to this SO question: Failed to initialize compiler: object java.lang.Object in compiler mirror not found
I tried the update-alternatives option (also changing the Java path in eclipse.ini) but then I got the "object java.lang.Object in compiler mirror not found" error in Eclipse problems. Since I didn't need openjdk-11 anyway I simply switched to openjdk-8.
I used Intellij for 4 months without any problems. Yesterday I installed it on another PC but I can't create a SBT Scala project.
Here the steps:
I create the project:
When started it says me that "SBT project need to be imported" so I click on "Enable Auto-Import" but then I get this error:
If I try to add Scala SDK from modules settings I get this error:
I downloaded Scala and SBT externally, I also tried all the suggested solutions from other similar threads but I can't resolve it.
How can I do?
Thank you in advance!
Add sbt.version to project/build.properties. You can check SBT version using sbt sbtVersion.
I'm new to working with both IntelliJ and Scala, so I've been trying to set up a basic HelloWorld project using it. However once I try to load the project I'm met with two problems
I get an error saying there was an "Error while importing SBT project"
No 'src' folder appears on the project tree
I've seen similar problems here and here, but I still can't get the project to load properly.
For some reason this site doesn't let you post an image until you have 10 reputation, so here is a link to the error message I'm receiving http://i.imgur.com/vDZB6SA.png.
From the looks of it, it seems like it's unable to download the necessary dependencies, however I was able to download the scala plugin earlier, so I can't see why there would be a problem now.
I tried following the advice here on updating the proxy settings, but that doesn't work either.
Has anyone encountered a similar problem? I'm really stuck here on how to proceed.
EDIT 1:
Details on IntelliJ
IntelliJ IDEA 2016.2.3
Build #IC-162.1812.17, built on August 30, 2016
JRE: 1.8.0_65-b17 amd64
JVM: Java HotSpot(TM) 64-Bit Server VM by Oracle Corporation
Setting up the proejct:
I just followed an example and went to New Project > Scala > SBT > name project and finish. Then once it loads I get the error displayed in the picture above. The SBT version is 0.13.8 and the Scala version is 2.11.8
I'm trying to develop on the Scala compiler project with the help of ScalaIDE. I followed this guide to set up the development environment. When I now try to build the mentioned projects, the reflect project won't get built. Instead, I get the following error via the console output:
uncaught exception during compilation: scala.reflect.internal.MissingRequirementError reflect Unknown Scala Problem
Having tried the provided ANT script of the project via the console, everything seems to work fine.
Does anyone know if I'm missing a hidden compiler flag, dependency or something like this?
Thanks!
With the IDE for Scala 2.10 you can only build the 2.10.x branch of the Scala compiler. If you want to work on master, you need to install a 2.11-based version of the IDE. We don't publicise IDE for 2.11 nightlies yet, but they are available at:
http://download.scala-ide.org/nightly/scala-ide-master-2.11.0-SNAPSHOT/