I've got the newest Scala IDE (3.0.2) and I want to compile my stuff with Scala 2.9.3. I've added that version of Scala as a Maven dependency and removed the default 2.10.0 that the IDE bundles with the new project (not my system Scala version, by the way!). The IDE then tells me Scala is not on the build path, even when I add in the jars to the build path. When I try to add a "Scala Library" through that dialogue, it doesn't give me any options and adds 2.10.0. I've gone through the project settings, and would have expected to see a "Scala version" option, but there isn't (only a "Java version" option.)
My question is this:
How do I add a different version of Scala as the Scala library in Scala IDE 3.0.2 ?
Thanks!
I asked a similar question a while back. Short answer is, you can't.
My post:
Scala-IDE 3.0: 2.9.2 -> 2.10.0
Related
I currently have Scala 2.12.3 installed and wish to switch it to 2.10. How would I go about doing this in Eclipse? I could not find any guides on it.
Its in eclipse's settings -> Scala Compiler.
You can try this link,
http://scala-ide.org/blog/scala-installations.html
You can change the scala version used for any project by
right click on project->scala->set the scala installation
you will get list of scala versions supported
I am using eclipse with m2eclipse-scala plugin. Currently, I get the following error message:
exampleA_2.10-2.0.1.jar of module build path is cross-compiled with an incompatible version of Scala (2.10.0). In case this report is mistaken, this check can be disabled in the compiler preference page
It looks like the versions of extracted Scala and Scala IDE match. I just wanted to make sure that this is a "false-negative" as described here and can be safely turned off.
As #The Archetypal Paul suggested, it was because I was using wrong Scala library.
If you are using Scala 2.11 (check at About Scala IDE -> installation details), you can downgrade by following instruction here. It's a lot easier than uninstalling and re-installing Scala IDE as other Stackoverflow posts recommend.
I also faced the same issue->
I am trying to use casbah jar in scala to integrate with mongodb.
After analyzing the problem i found that ->
i am trying to use casbah 2.9.1 version and my scala version is 2.11.8
Root-Cause of such error is : your jar is compiled in 2.9.0 version and you are using scala 2.11.8 version
So, to resolve that i use the jar that is compiled into 2.11 scala version-
<groupId>org.mongodb</groupId>
<artifactId>casbah-core_2.11</artifactId>
<version>3.1.1</version>
I was facing similar issue in Eclipse IDE where I had built a Spark scala project in Maven. The scala version was set to 2.11.
Later, I upgraded Scala-Ide plugin in Eclipse after which my project marked below errors,
exampleA_2.10-2.0.1.jar of module build path is cross-compiled with an incompatible version of Scala (2.10.0). In case this report is mistaken, this check can be disabled in the compiler preference page
Right click project folder > scala > set scala version. Here my scala version was displayed as 2.10. I selected 2.11 and removed all the error messages.
I have the Scala and SBT plugins enabled (I tried switching off the SBT plugin as well to test) - when I import an existing Play framework project, go to "Project Structure", go to "Modules", select module, then "Dependencies" tab - I do not see the Scala Compiler library options at all over there (I have JDK8 and it is selected as the IDE project JVM and I have Scala and SBT on the computer - Scala v2.11.7 & SBT v0.13.9). Any ideas on what I might be missing? I only see the JDK and Module source under Dependencies but no Scala compiler options.
I am familiar with the IntelliJ blog referencing how to import a play framework project: https://www.jetbrains.com/idea/help/getting-started-with-play-2-x.html
I am only showing the scala sdk in my Global Libraries tab in Project Structure.
Are you not able to build your project in IntelliJ?
I installed scalaIDE on ubuntu. as installed, it has both scala 2.11.6 and 2.10.5 build in. The version I need is 2.10.4. How do I add that version into scalaIDE?
Window -> Preferences -> Scala -> Installations
Click Add. Probably you will already have the version of scala you need in ~/.sbt/boot. Just choose, name it and click Ok.
Reference: BYOS (Bring Your Own Scala)
I am using the sbtantlr plugin and adapting it to use antlr v3.5. It used to work fine with scala 2.9.2.
Today I upgraded my scala to 2.10.0.
And I compiled the plugin in 2.10.0 and put the plugin 'sbtantlr.jar' in the 'lib' directory of my main scala project.
SBT stopped working with this error message:
Binary incompatibility in plugins detected.
I revert the compiler version to 2.9.2 and it works fine.
Is it because SBT (the official binary release) was built with 2.9? Where can I find the information?
Yes, sbt 0.12.x are built with 2.9x and all plugins need to match the binary Scala version.
To add more information to what Yann said, Scala only guarantees compatibility between minor versions. That is, code compiled with any 2.8.x version is compatible with code compiled with any other 2.8.x version, but no code compiled with 2.8.x is compatible with code compiled by a 2.9.x version.
Now, SBT is a Scala application, and both the plugins and build configuration are libraries to it. SBT 0.12.x was compiled with Scala 2.9.x, so all plugins and project build configuration must also be compiled with Scala 2.9.x.
The project itself can be compiled with any version, as SBT does not need to interact with it.