Scala project doesn't compile anymore on Eclipse 4.4

[hol...@informatik.htw-dresden.de]

I've upgraded Eclipse from 4.3 to 4.4 on Ubuntu. To start from fresh, I've also removed my .eclipse and installed the Scala IDE from http://download.scala-ide.org/sdk/lithium/e44/scala211/dev/site. I used this version as there's no information as to whether version 3.0.4 works with Eclipse 4.4.

I've cleaned my Scala project and started Eclipse with -clean. However, the code doesn't compile anymore because of the following problems:

1. One of my packages uses import scala.swing._ This produces the error message
   object swing is not a member of package scala
2. I use spire and scalaxy-loops. It seems that the 2.10 versions of these, which I have in my workspace, can't be used. Scala reports
   can't expand macros compiled by previous versions of Scala

I didn't change any of the default options for Scala.

[Simon Schäfer]

On 08/20/2014 03:41 PM, hol...@informatik.htw-dresden.de wrote:

I've upgraded Eclipse from 4.3 to 4.4 on Ubuntu. To start from fresh, I've also removed my .eclipse and installed the Scala IDE from http://download.scala-ide.org/sdk/lithium/e44/scala211/dev/site. I used this version as there's no information as to whether version 3.0.4 works with Eclipse 4.4.

I've cleaned my Scala project and started Eclipse with -clean. However, the code doesn't compile anymore because of the following problems:

1. One of my packages uses import scala.swing._ This produces the error message
   object swing is not a member of package scala

scala.swing is no longer part of the Scala 2.11 library. You have to add it explicitly as a dependency.

1. I use spire and scalaxy-loops. It seems that the 2.10 versions of these, which I have in my workspace, can't be used. Scala reports
   can't expand macros compiled by previous versions of Scala

You can't mix 2.10 libraries with Scala 2.11. Either upgrade your dependencies or configure a 2.10 library, as described here: http://scala-ide.org/blog/scala-installations.html

I didn't change any of the default options for Scala.

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[hol...@informatik.htw-dresden.de]

Am Mittwoch, 20. August 2014 16:17:57 UTC+2 schrieb Simon Schäfer:

scala.swing is no longer part of the Scala 2.11 library. You have to add it explicitly as a dependency.

How do I add swing as a dependency using Eclipse and the Scala IDE? I don't see swing in the "add library" dialogue of the project properties.

[Simon Schäfer]

Use a build tool like sbt or download the library manually from the web and add it to your project.

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[hol...@informatik.htw-dresden.de]

Where do I find Scala Swing? A Google search found https://github.com/scala/scala-swing, but this is unmaintained.

Maybe I should downgrade to Scala 2.10 instead. Does http://downloads.typesafe.com/scalaide-pack/3.0.3.vfinal-210-20140327/scala-SDK-3.0.3-2.10-linux.gtk.x86_64.tar.gz work for Eclipse 4.4?

[Simon Schäfer]

On 08/20/2014 05:30 PM, hol...@informatik.htw-dresden.de wrote:

Where do I find Scala Swing? A Google search found https://github.com/scala/scala-swing, but this is unmaintained.

http://search.maven.org/#search|gav|1|g%3A%22org.scala-lang%22%20AND%20a%3A%22scala-swing%22

In order to add it to sbt if you want to use that: http://stackoverflow.com/questions/9025122/whats-wrong-with-my-scala-swing

Maybe I should downgrade to Scala 2.10 instead. Does http://downloads.typesafe.com/scalaide-pack/3.0.3.vfinal-210-20140327/scala-SDK-3.0.3-2.10-linux.gtk.x86_64.tar.gz work for Eclipse 4.4?

No, the Scala IDE 3.x timeline doesn't support Luna.

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[hol...@informatik.htw-dresden.de]

I've added

scalaVersion := "2.11.2"
libraryDependencies += "org.scala-lang" %% "scala-swing" % "2.11.2"

and I get

[error] (*:update) sbt.ResolveException: unresolved dependency: org.scala-lang#scala-swing_2.11;2.11.2: not found

There's no release version for 2.11 on http://search.maven.org/#search|gav|1|g%3A%22org.scala-lang%22%20AND%20a%3A%22scala-swing%22

[Simon Schäfer]

Then use the latest milestone. scala-swing isn't officially supported anymore, if the milestone doesn't work too, then you probably have to live with the Java Swing API.

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[hol...@informatik.htw-dresden.de]

I've set Scala to 2.10 instead in the project properties. The code compiles and works, so it saves me a lot of hassle. However, the IDE issues the warning

The version of scala library found in the build path (2.10.4) is different from the one provided by scala IDE (2.11.2.). Make sure you know what you are doing.    Scala        Unknown    Scala Classpath Problem

How do I remove this warning?

[iulian dragos]

On Wed, Aug 20, 2014 at 7:30 PM, <hol...@informatik.htw-dresden.de> wrote:

I've added

scalaVersion := "2.11.2"
libraryDependencies += "org.scala-lang" %% "scala-swing" % "2.11.2"

Wrong version. Since scala-swing is not part of Scala anymore, it has it's own version (current one is 1.0.1). If you follow the Sbt intructions on this page, you should have a copy-paste solution:

http://search.maven.org/#artifactdetails%7Corg.scala-lang.modules%7Cscala-swing_2.11%7C1.0.1%7Cbundle

cheers,

iulian

 

and I get

[error] (*:update) sbt.ResolveException: unresolved dependency: org.scala-lang#scala-swing_2.11;2.11.2: not found

There's no release version for 2.11 on http://search.maven.org/#search|gav|1|g%3A%22org.scala-lang%22%20AND%20a%3A%22scala-swing%22

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