Scala classes not generated during the build of the mixed java and scala project

[rawiafray]

Hello , this is my POM.xml , when i try to build my project , scala classes are not generated but java classes are generated

`
4.0.0
ariskk
distributedWekaSpark
jar
0.1.0-SNAPSHOT

  <build>
    <plugins>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.3</version>
        <configuration>
              <artifactSet>
                <excludes>
                  <exclude>org.apache.hadoop:hadoop-client</exclude>
                  <exclude>org.apache.spark:spark-core_2.10</exclude>
                  <exclude>nz.ac.waikato.cms.weka:distributedWekaHadoop</exclude>
                </excludes>
              </artifactSet>
              <filters>
        <filter>
            <artifact>*:*</artifact>
            <excludes>
                <exclude>META-INF/*.SF</exclude>
                <exclude>META-INF/*.DSA</exclude>
                <exclude>META-INF/*.RSA</exclude>
            </excludes>
        </filter>
    </filters>
          <!-- put your configurations here -->
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
  
      <plugin>
        <groupId>org.scalatest</groupId>
        <artifactId>scalatest-maven-plugin</artifactId>
        <version>1.0</version>
        <configuration>
          <reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
          <junitxml>.</junitxml>
          <filereports>WDF TestSuite.txt</filereports>
        </configuration>
        <executions>
          <execution>
            <id>test</id>
             <goals>
              <goal>test</goal>
             </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
   </build>




  <dependencies>
    <dependency>
	    <groupId>org.apache.spark</groupId>
	    <artifactId>spark-core_2.10</artifactId>
	    <version>1.1.0</version>
    </dependency>
    <dependency>
	    <groupId>nz.ac.waikato.cms.weka</groupId>
	    <artifactId>distributedWekaBase</artifactId>
	    <version>1.0.6</version>
    </dependency>
    <dependency>
	    <groupId>nz.ac.waikato.cms.weka</groupId>
	    <artifactId>weka-dev</artifactId>
	    <version>3.7.11</version>
    </dependency>
    <dependency>
	    <groupId>org.scalatest</groupId>
	    <artifactId>scalatest-maven-plugin</artifactId>
	    <version>1.0</version>
	    <type>maven-plugin</type>
    </dependency>
    <dependency>
	    <groupId>org.scalatest</groupId>
	    <artifactId>scalatest_2.10</artifactId>
	    <version>2.2.3-SNAP2</version>
	    <scope>test</scope>
    </dependency>
  </dependencies>
  <organization>
    <name>University of Manchester</name>
  </organization>
  <developers>
        <developer>
            <id>ariskk</id>
            <name>Aris-Kyriakos Koliopoulos</name>
            <email>ak.koliopoulos@gmail.com</email>
            <organization>School of Computer Science,University or Manchester</organization>
            <organizationUrl>http://www.cs.manchester.ac.uk/</organizationUrl>
        </developer>
    </developers>
</project>`