I've just uninstalled IntelliJ 13 and installed 14 (community edition). I set up jdk, and then installed the Scala plugin, and created a new Scala > SBT project. It asked me to setup the Scala SDK which I did. I let it autoimport, and it created the src. etc folders. I then created a scala class. It compiles and runs fine. However, IntelliJ shows built in scala stuff as errors. For example:
For some reason, intellij is showing all scala library stuff as errors. However, the program compiles and runs fine. Has anybody else come across this?
Related
I created a basic Scala Dotty project using Dotty template and import the project to IntelliJ IDE.
Everything works fine when I use the sbt command line.
When I try to build or run it inside IntelliJ IDE, I got following errors:
Error:scalac: Multiple 'scala-library*.jar' files (scala-library-0.9.0-RC1.jar, scala-library-2.12.6.jar) in Scala compiler classpath in Scala SDK sbt: ch.epfl.lamp:dotty-library_0.9:0.9.0-RC1:jar
Any ideas how to solve this?
IDE support for Dotty
Currently, the only IDE we officially support is Visual Studio Code.
Anyway when you import a project to IntelliJ IDEA check "use sbt shell". At least for me after that a test project compiles and runs with Ctrl+Shift+F10.
It's possible that not everything will work. For example Dotty macros don't but if I compile and run manually then they do.
One fine day IntelliJ started highlighting my working Scala code in red. While following commands run without a hitch, IntelliJ thinks that code is full of errors an missing a lot of dependencies.
sbt clean
sbt reload
sbt update
sbt compile
sbt assembly
It reports a lot of Cannot resolve symbols in imports, classes and method-calls on objects like the following. Moreover, it thinks a lot of imports are unused (for the symbols that it can't find)
Interestingly, all this is happening in only one of my projects (that contains two submodules inside parent module), while other Scala projects (including those containing submodules) are working fine.
Things that I've tried without luck:
Delete (rm -rf) build-related directories like .idea, target, ~/.ivy2/caches
Invalidate Caches / Restart...
Update IntelliJ IDEA and Scala plugin to latest versions
Close and re-import the project, quit IntelliJ, reboot the PC (!)
I'm using:
IntelliJ IDEA 2017.3.2 (Community Edition)
Build #IC-173.4127.27, built on December 25, 2017
JRE: 1.8.0_152-release-1024-b8 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Mac OS X 10.13.2
My project configurations are:
Scala v2.11.11
SBT v1.0.3
Once again, I'd like to remind that my Scala code is completely functional and that I'm able to run the JAR generated by sbt assembly elsewhere without an issue.
This solution worked for me: Why does intellij IDEA highlight build.sbt?
Go to the menu: File > Invalidate Caches/Restart
Such things happen when project SDK is not set. Also make sure that you have Add Framework Support -> Scala enabled.
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
My SBT project imports itself perfectly to IDEA IDE on MacOS, but on the Ubuntu it shows dozens of errors about not being able to resolve symbols.
for example:
import play.api.mvc.Action
reports Unused import statement from withing IDEA
and reference to Action several lines afterwards is reported as Cannot resolve method Action.apply
The problem is only to be seen in the IDE as sbt run from the command line is perfectly ok.
My current version of the IntelliJ IDEA IDE is 14 Ultimate
Scala plugin version 1.2.1
SBT version on the Ubuntu host 0.13.7
JDK version Oracle JDK 1.8.0_25
I had the same problem (running Fedora 20). Try with the EAP version of Intellij IDEA 14 (see : https://confluence.jetbrains.com/display/IDEADEV/IDEA+14+EAP).
Also, you have to use the EAP version of the Scala plugin (parameters > Frameworks and Languages > Scala > Misc).
It worked for me.
I have use the IntelliJ Scala plugin before, in 13 and 13.1. I upgraded to 14, and it doesn't work anymore for my SBT project.
For all Scala standard lib stuff, I see errors like "Cannot find symbol scala.Option".
at scala project, compiler error - Cannot resolve symbol List? says I need to have the Scala facet for my module. I looked in facets, and Scala wasn't an option.
I've uninstalled IntelliJ and the Scala plugin and my settings and the projects files multiple times, but still happens.
How do I fix this?
the new scala plugin for intellij 14 removed the facet and replaced it with Scala SDK library, see blog
for sbt project, I guess the best bet is to re-create your project by:
File -> open -> select the build.sbt of your project in popup -> delete existing project and import
I had a similar issue when a Java module calls an Scala object. The issue was from the wrong setup in Source Folders; the Scala source was in src/main/scala/..., but in the Project Structure, the Source Folders were setup as src by default. When I changed it as src/main/scala, the Java module can find the Scala object correctly.
I fixed this by using the nightly builds of the Scala plugin.
The fixes have now been incorporated into the stable versions.
In my case i just had to reload the IDE...