Plugin execution not covered by lifecycle configuration

Plugin execution not covered by lifecycle configuration: org.scala-tools:maven-scala-plugin:2.15.2:testCompile (execution: default, phase: test-compile)

If your pom.xml has been automatically generated then chances are there that pluginManagement tag is missing.

<build>

    <pluginManagement>

        <plugins>

            <plugin> ... </plugin>

            <plugin> ... </plugin>

                  ....

        </plugins>

    </pluginManagement>

</build>

Just add those closing and starting tags and this should work.