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POMaven compile replies 'No sources to compile' for scala project
 

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  1. POMaven compile replies 'No sources to compile' for scala project
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    <p>I have the following (single) scala class</p> <pre><code>[ 14253 Oct 30 8:44] ./pom.xml [ 9083 Oct 30 8:30] ./scaladem.iml [ 102 Oct 29 19:21] ./src [ 102 Oct 29 19:21] ./src/main [ 102 Oct 29 19:21] ./src/main/scala [ 102 Oct 29 19:21] ./src/main/scala/com [ 102 Oct 29 19:21] ./src/main/scala/com/blazedb [ 102 Oct 30 8:30] ./src/main/scala/com/blazedb/scalademo [ 4646 Oct 30 8:30] ./src/main/scala/com/blazedb/scalademo/SDemo.scala </code></pre> <p>Here is the applicable section of the pom</p> <pre><code>&lt;plugin&gt; &lt;groupId&gt;net.alchim31.maven&lt;/groupId&gt; &lt;artifactId&gt;scala-maven-plugin&lt;/artifactId&gt; &lt;version&gt;3.1.6&lt;/version&gt; &lt;configuration&gt; &lt;recompileMode&gt;incremental&lt;/recompileMode&gt; &lt;javacArgs&gt; &lt;javacArg&gt;-Xlint:unchecked&lt;/javacArg&gt; &lt;javacArg&gt;-Xlint:deprecation&lt;/javacArg&gt; &lt;/javacArgs&gt; &lt;/configuration&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;scala-compile-first&lt;/id&gt; &lt;phase&gt;process-resources&lt;/phase&gt; &lt;goals&gt; &lt;goal&gt;add-source&lt;/goal&gt; &lt;goal&gt;compile&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;execution&gt; &lt;id&gt;scala-test-compile&lt;/id&gt; &lt;phase&gt;process-test-resources&lt;/phase&gt; &lt;goals&gt; &lt;goal&gt;testCompile&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;/plugin&gt; </code></pre> <p>When we run</p> <pre><code>mvn compile </code></pre> <p>We get (notice the 'no sources' ..)</p> <pre><code>[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building SDemo 1.0 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ scalademo --- [INFO] No sources to compile [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ </code></pre> <p>Update: when running the following command</p> <pre><code>$mvn scala:compile -DdisplayCmd=true </code></pre> <p>The compilation succeeds.</p> <p>From suggestion of @badtrumpet I have added the explicit as shown below </p> <pre><code>&lt;sourceDirectory&gt;src/main/scala&lt;/sourceDirectory&gt; </code></pre> <p>And this works even by mvn compile. But that would be an issue for mixed java/scala projects. </p>
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