Frequently Asked Questions

Read-Eval-Print-Loop (aka scala:console)

Why does maven net let me call scala:console?

Maven 3.0 made its policy more strict about shortened plugin names. If you wish to use scala:goal forms on the command-line you must create a <pluginGroup> element in your ~/.m2/settings.xml file that contains org.scala-tools as a pluginGroup.

Why does the mvn scala:console goal not compile the project?

The authors of the plugin felt it was much more flexible to allow a REPL to be started during the coding of a project. The REPL is mostly used for experimenting with APIs and therefore users should not need a functioning project to test out potential code paths. Users who want to make use of their latest changes should type "mvn compile scala:console" or "mvn test-compile scala:console" rather than just "mvn scala:console"

Does the REPL support auto-complete?

As of Scala 2.8.0 the REPL supports auto-complete features.

Eclipse Integration

Is there a wiki detailing Scala/Eclipse/Maven integration

Yes, it requires a Scala trac user account and is located here

Why does the mvn eclipse:eclipse not add the src/main/scala directory as a source path

The maven-eclipse-plugin is not maintained/integrated with the maven-scala-plugin. If you would like to have the src/main/scala directory added as a source path in eclipse, you must configure it useing the maven-build-helper-plugin's add-source goal Example:

<project>

  ...
  <build>
   <plugins>
     <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>add-source</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>add-source</goal>
            </goals>
            <configuration>
              <sources>
                <source>src/main/scala</source>
                ...
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>
				

Can you synchronize eclipse configuration with the scalac plugin pom configuration?

Not Currently