I'm quite new to Scala and sbt and would like to create a fat jar files which includes all the dependency libraries. It looks like the original sbt does not do that and I have to user something like sbt-assembly. However I can't quite figure out how should I install and use it. Can someone elaborate on it for me?
Drop this into project/plugins.sbt
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.13.0")
That should let you run sbt assembly now. Then you can solve merge conflicts in your build.sbt or Build.scala.
Related
When I build an artefact with
sbt universal:packageZipTarball
the scala-compiler.jar is included as a lib in my artefact.
Why is the scala-compiler needed at runtime? In my understanding it shouldn't be needed.
How can I exclude this jar?
It is probably pulled in as a transitive dependency by one of your libraryDependencies. You can use this sbt plugin to find out which one:
https://github.com/sbt/sbt-dependency-graph
Once you found out, you can block it by appending exclude("org.scala-lang", "scala-compiler") to the relevant dependency.
For instance, older versions of the pureconfig library used to erroneously pull this dependency in. It can be fixed like so:
libraryDependencies +=
"com.github.pureconfig" %% "pureconfig" % "0.10.0" exclude("org.scala-lang", "scala-compiler")
i have a scala project using the scala plugin.
I need to use this monocle library, (https://www.optics.dev/Monocle/) for a project, but I just have no idea how to add it to my project.
For sbt projects, there should be a build.sbt file, where I could simply put in something like this:
libraryDependencies ++= Seq(
"com.github.julien-truffaut" %% "monocle-core" % "2.0.3",
"com.github.julien-truffaut" %% "monocle-macro" % "2.0.3",
)
Which should add the dependency for me.
However, I have no idea how I should do this in my current project, and can't really find any leads online, theres no.jar-files anywhere that I can download.
I also tried linking to the library documentation with this thing:
Which did not work.
My directory structure looks like this:
I am trying to add this Scala Library into Eclipse so as to add available functions I can use on Actors.
I've downloaded the file and extracted it and tried adding it to my workspace in the project explorer, but when I try, Eclipse tells me it can't find any projects in the file. I'm sure that there is a tutorial or something online that explains exactly how to do this, but like I said, I'm not sure about all the terminology, so I don't know what to search for to get the result I want.
The easiest way is to create an sbt project and use the sbteclipse plugin.
Your project structure should look like this:
build.sbt
project/build.properties
project/eclipse.sbt
build.sbt
(note that lines of code should be separated by a white line)
name := "ProjectName"
libraryDependencies += "org.scala-lang.modules" %% "scala-async" % "0.9.2"
build.properties
sbt.version=0.13.5
eclipse.sbt
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.5.0")
Then from the root directory execute sbt and within the sbt command line execute eclipse or eclipse with-sources=true
You can use sbt-extras or activator to get a specialized version that will automatically download the correct sbt version based on the build.properties file.
You could add the sbteclipse plugin as a default plugin, making it available in all projects by creating eclipse.sbt in the ~/.sbt/0.13/plugins directory instead of the project directory
If you created your project via sbt, please follow the instruction on the github page of async. Namely, add this libraryDependencies += "org.scala-lang.modules" %% "scala-async" % "0.9.2" to build.sbt, run sbt, regenerate eclipse files with "eclipse" command and finally re-import project into eclipse
I am trying to add Scalding 2.10 as a managed dependency via build.sbt like so:
name := "ss"
version := "1.0"
libraryDependencies += "com.twitter" % "scalding_2.10" % "0.10.0"
IntelliJ downloads the jar and adds it as an external library (see screen below) but fails to resolve the com.twitter namespace.
I have tried both invalidating the IntelliJ cache and generating project files via sbt gen-idea but neither solutions have worked. Any ideas would be greatly appreciated.
The scalding jar file scalding_2.10 has no code in it to compile against. Its just 300 Bytes in size.
The correct dependency I feel should be
libraryDependencies += "com.twitter" % "scalding-core_2.10" % "0.11.1"
As the comment suggest try rm-ing your ivy2 cache, and try sbt gen-idea. If that doesn't work, other things to check:
makes sure you have indeed got the scala plugin installed.
Most likely you're java SDK is not set or pointing somewhere wrong; right click the project dir, click "Open Module Settings", go to SDK and make sure the path is correctly set to the jdk otherwise syntax highlighting will likely break.
To test your deps have been properly pulled in from tinternet, try sbt compile; if it compiles then you should indeed have downloaded the dependency properly.
I added the Mailer plugin to my Play Framework 2 project. It compiles and works fine, but IntelliJ can't resolve any of its classes. I would normally just add the jar as a module in my IntelliJ project settings, but I don't have a jar. As far as I understand, the plugin is automatically being pulled from some repository. So how do I make IntelliJ aware of it?
I added this to conf/play.plugins
1500:com.typesafe.plugin.CommonsMailerPlugin
And this as a dependency in project/build.scala
"com.typesafe" %% "play-plugins-mailer" % "2.0.4"
I resolve problems like this with the sbt-idea SBT plugin. Just add this to your project/plugins.sbt file:
addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.2.0")
Then, whenever you change your project dependencies, run sbt idea and your IntelliJ project will be updated.
I had to delete the reference to com.github.mpeltonen in my plugins.sbt file first. Then as Bill said, I needed to run play idea. If I tried to run play idea without deleting the reference I got this exception:
java.lang.NoSuchMethodError: org.sbtidea.SbtIdeaPlugin$.ideaSettings()Lscala/collection/Seq;