Rich Dougherty ⬦ rd.nz

Maven and Eclipse for Scala 2.9

These instructions were tested with the following versions.

Instructions:

  1. Download Maven and install in ~/opt/apache-maven-3.0.3.

  2. Create a Maven project with the Scala archetype.

    $ JAVA_HOME=/usr/lib/jvm/java-6-sun ~/opt/apache-maven-3.0.3/bin/mvn archetype:generate -Dfilter=org.scala-tools.archetypes:scala-archetype-simple

  3. Test compilation.

    $ JAVA_HOME=/usr/lib/jvm/java-6-sun ~/opt/apache-maven-3.0.3/bin/mvn install

  4. Update the POM to compile with Scala 2.9.1 rather than Scala 2.8.

    diff --git a/pom.xml b/pom.xml
index 6522932..417619d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
     <maven.compiler.source>1.5</maven.compiler.source>
     <maven.compiler.target>1.5</maven.compiler.target>
     <encoding>UTF-8</encoding>
-    <scala.version>2.8.0</scala.version>
+    <scala.version>2.9.1</scala.version>
   </properties>
 
 <!--
@@ -55,13 +55,13 @@
     <dependency>
       <groupId>org.scala-tools.testing</groupId>
       <artifactId>specs_${scala.version}</artifactId>
-      <version>1.6.5</version>
+      <version>1.6.9</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest</artifactId>
-      <version>1.2</version>
+      <artifactId>scalatest_${scala.version}</artifactId>
+      <version>1.6.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

  5. Test compilation with Scala 2.9.

    $ JAVA_HOME=/usr/lib/jvm/java-6-sun ~/opt/apache-maven-3.0.3/bin/mvn install

  6. Update the POM to include Scala configuration for Maven’s Eclipse plugin.

    diff --git a/pom.xml b/pom.xml
index 7b17d81..ea26d11 100644
--- a/pom.xml
+++ b/pom.xml
@@ -110,6 +110,35 @@
           </includes>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-eclipse-plugin</artifactId>
+        <version>2.8</version>
+        <!-- see http://maven.apache.org/plugins/maven-eclipse-plugin/eclipse-mojo.html for more information -->
+        <configuration>
+          <downloadSources>true</downloadSources>
+          <downloadJavadocs>true</downloadJavadocs>
+          <projectnatures>
+            <projectnature>org.scala-ide.sdt.core.scalanature</projectnature>
+            <projectnature>org.eclipse.jdt.core.javanature</projectnature>
+          </projectnatures>
+          <buildcommands>
+            <buildcommand>org.scala-ide.sdt.core.scalabuilder</buildcommand>
+          </buildcommands>
+          <classpathContainers>
+            <classpathContainer>org.scala-ide.sdt.launching.SCALA_CONTAINER"</classpathContainer>
+            <classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>
+          </classpathContainers>
+          <excludes>
+            <exclude>org.scala-lang:scala-library</exclude>
+            <exclude>org.scala-lang:scala-compiler</exclude>
+          </excludes>
+          <sourceIncludes>
+            <sourceInclude>**/*.scala</sourceInclude>
+            <sourceInclude>**/*.java</sourceInclude>
+          </sourceIncludes>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

  7. Create Eclipse metadata for the project.

    $ JAVA_HOME=/usr/lib/jvm/java-6-sun ~/opt/apache-maven-3.0.3/bin/mvn eclipse:eclipse

  8. Download Eclipse 3.6.2 (Helios SR2) and install in ~/opt/eclipse-helios-SR2.

  9. Start Eclipse.

    $ ~/opt/eclipse-helios-SR2/eclipse&

  10. Add the Scala 2.9 update site to Eclipse. ``` http://download.scala-ide.org/releases-29/stable/site

```
  1. Install Scala plugins from the update site:
*   Scala IDE for Eclipse
*   Scala IDE for Eclipse Source Feature
*   JDT Weaving

  1. Restart Eclipse to apply the new plugins.

  2. Add a classpath variable for M2_REPO and set to ~/.m2/repository.

  3. Import the project.

  4. Everything should compile and run correctly.

Useful pages: