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  1. PO
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    <p>Here's an example (simple) pom.xml which I use as a bit of a boilerplate for Scala compilation and build using Maven:</p> <pre><code>&lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;badtrumpet&lt;/groupId&gt; &lt;artifactId&gt;blog&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;inceptionYear&gt;2013&lt;/inceptionYear&gt; &lt;packaging&gt;jar&lt;/packaging&gt; &lt;properties&gt; &lt;scala.version&gt;2.10.2&lt;/scala.version&gt; &lt;commons.codec.version&gt;1.8&lt;/commons.codec.version&gt; &lt;grizzled.version&gt;1.0.1&lt;/grizzled.version&gt; &lt;slf4j-log4j12.version&gt;1.7.5&lt;/slf4j-log4j12.version&gt; &lt;/properties&gt; &lt;repositories&gt; &lt;repository&gt; &lt;id&gt;Sonatype repository&lt;/id&gt; &lt;name&gt;Sonatype's Maven repository&lt;/name&gt; &lt;url&gt;http://oss.sonatype.org/content/groups/public&lt;/url&gt; &lt;/repository&gt; &lt;repository&gt; &lt;id&gt;scala-tools.org&lt;/id&gt; &lt;name&gt;Scala-Tools Maven2 Repository&lt;/name&gt; &lt;url&gt;http://scala-tools.org/repo-releases&lt;/url&gt; &lt;/repository&gt; &lt;repository&gt; &lt;id&gt;milestone.repo.springsource.org&lt;/id&gt; &lt;name&gt;repo.springsource.org-milestone&lt;/name&gt; &lt;url&gt;https://repo.springsource.org/libs-milestone&lt;/url&gt; &lt;/repository&gt; &lt;/repositories&gt; &lt;pluginRepositories&gt; &lt;pluginRepository&gt; &lt;id&gt;scala-tools.org&lt;/id&gt; &lt;name&gt;Scala-Tools Maven2 Repository&lt;/name&gt; &lt;url&gt;http://scala-tools.org/repo-releases&lt;/url&gt; &lt;/pluginRepository&gt; &lt;/pluginRepositories&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.scala-lang&lt;/groupId&gt; &lt;artifactId&gt;scala-library&lt;/artifactId&gt; &lt;version&gt;${scala.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;junit&lt;/groupId&gt; &lt;artifactId&gt;junit&lt;/artifactId&gt; &lt;version&gt;3.8.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;commons-codec&lt;/groupId&gt; &lt;artifactId&gt;commons-codec&lt;/artifactId&gt; &lt;version&gt;${commons.codec.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.clapper&lt;/groupId&gt; &lt;artifactId&gt;grizzled-slf4j_2.10&lt;/artifactId&gt; &lt;version&gt;${grizzled.version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.slf4j&lt;/groupId&gt; &lt;artifactId&gt;slf4j-log4j12&lt;/artifactId&gt; &lt;version&gt;${slf4j-log4j12.version}&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;build&gt; &lt;sourceDirectory&gt;src/main/scala&lt;/sourceDirectory&gt; &lt;testSourceDirectory&gt;src/test/scala&lt;/testSourceDirectory&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.scala-tools&lt;/groupId&gt; &lt;artifactId&gt;maven-scala-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;goals&gt; &lt;goal&gt;compile&lt;/goal&gt; &lt;goal&gt;testCompile&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;configuration&gt; &lt;scalaVersion&gt;${scala.version}&lt;/scalaVersion&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;reporting&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.scala-tools&lt;/groupId&gt; &lt;artifactId&gt;maven-scala-plugin&lt;/artifactId&gt; &lt;configuration&gt; &lt;scalaVersion&gt;${scala.version}&lt;/scalaVersion&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/reporting&gt; </code></pre> <p></p>
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    1. COYou added explicitly the <sourcDirectory> Do you also have any java code? In that case would this not be broken? BTW this DOES work for scala alone: now the mvn compile "finds" the scala.. but we need both java and scala.
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    2. COYou can just add the normal maven compiler plugin into the plugins section, change the sourceDirectory to /src/main, make sure you place your java code under /src/main/java and your scala code under /src/main/scala and it should work just fine...will post an example pom fragment which works for me in second answer below...
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