ScalaBasePlugin scalaConsole/scalaTestConsole tasks

scalaConsole1

apply plugin: 'scala'

repositories {
    mavenCentral()
}

ext {
    versions = [
        scala: '2.9.2',
        scalatest: '2.0.M3',
        scalacheck: '1.10.1'
    ]
}

dependencies {
    runtime "org.scala-lang:scala-compiler:$versions.scala"
    compile "org.scala-lang:scala-library:$versions.scala"
}

scalaConsole.dependsOn(build)
scalaConsole.dependsOn(test)
scalaConsole.classpath += sourceSets.main.output
scalaTestConsole.classpath += sourceSets.test.output

This configuration will produce the following errors in Scala 2.11:

Failed to created JLineReader: java.lang.NoClassDefFoundError: jline/console/completer/Completer
Falling back to SimpleReader.

JLine was unforked from Scala 2.11, so we need to bring in the library manually.

apply plugin: 'scala'

repositories {
    mavenCentral()
}

ext {
    versions = [
        jline: '2.12.1',
        scala: '2.11.6'
    ]
}

dependencies {
    compile "org.scala-lang:scala-library:${versions.scala}"

    runtime "jline:jline:${versions.jline}"
    runtime "org.scala-lang:scala-compiler:${versions.scala}"
}

scalaConsole.dependsOn(build)
scalaConsole.classpath += sourceSets.main.runtimeClasspath

@sethrylan it would be nice to include the above comment's sourceSets.main.runtimeClasspath in the gist for your blog, I'm sure others have hunted for it. Otherwise you can't run parts of your code that have external dependencies.