Avoid Eclipse ignore garbage in Scala Maven project - eclipse

Question

the only way I've found to have maven compile scala sources on the command line using mvn is to add the executions explicitly in the scala-maven-plugin.
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.0.1</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<args>
<arg>-deprecation</arg>
<arg>-unchecked</arg>
</args>
<jvmArgs>
<jvmArg>-Xms128m</jvmArg>
<jvmArg>-Xmx1024m</jvmArg>
</jvmArgs>
</configuration>
</plugin>
However, Eclipse does not like these executions and gives the following errors.
Plugin execution not covered by lifecycle configuration: net.alchim31.maven:scala-maven-plugin:3.0.1:compile (execution: default, phase: compile)
Plugin execution not covered by lifecycle configuration: net.alchim31.maven:scala-maven-plugin:3.0.1:testCompile (execution: default, phase: test-compile)
Eclipse suggests permanently marking the goals as ignored, but this means a lot of ugly garbage is added to my pom. I mean, XML is already hard to look at. Is there a better way to configure my project to compile the sources with mvn? Following is what Eclipse adds.
<pluginManagement>
<plugins>
<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>
net.alchim31.maven
</groupId>
<artifactId>
scala-maven-plugin
</artifactId>
<versionRange>
[3.0.1,)
</versionRange>
<goals>
<goal>testCompile</goal>
<goal>compile</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore></ignore>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>

Answer 1

m2e requires you install specific m2e plugins.
The one for scala-maven-plugin is m2e-scala: https://github.com/sonatype/m2eclipse-scala
Remove the pluginManagement that disables scala-maven-plugin, and install m2e-scala
http://alchim31.free.fr/m2e-scala/update-site
BTW, latest scala-maven-plugin is 3.1.0, not 3.0.1.
Cheers,
Stéphane