How to setup a Maven Scala project with IntelliJ IDEA support

Setting up a Maven and Scala project with IDEA is simple.

Install IntelliJ IDEA Community Edition and the Scala plugin (File -> Settings -> Plugins -> Available).

Generate your maven project using the simple Scala archetype:

mvn org.apache.maven.plugins:maven-archetype-plugin:1.0-alpha-7:create 
    -DarchetypeGroupId=org.scala-tools.archetypes  
    -DarchetypeArtifactId=scala-archetype-simple
    -DarchetypeVersion=1.2
    -DremoteRepositories=http://scala-tools.org/repo-releases
    -DgroupId=group
    -DartifactId=artifact

Add the Scala compiler lib to your project dependencies in the pom.xml file:

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-compiler</artifactId>
        <version>${scala.version}</version>
        <scope>compile</scope>
    </dependency>
 </dependencies>        

Update the Scala version configuration to a recent release:

<properties>
    <scala.version>2.7.7</scala.version>
</properties>

Open the a new project. Select the pom.xml in the file dialog.

An notification will pop up. Click "Create Scala Facet".

Done.

You can now compile and execute as usual and run the maven build mvn install with the Maven Tool Window. (The M2_HOME environment variable or Maven home settings (File -> Settings -> Maven -> Maven home directory) have to be present.)