View source for MNG-6189

As discussed in:

https://stackoverflow.com/questions/46742407/some-problems-were-encountered-while-building-the-effective-model-for
when you see the warning:
<pre>
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.bitplan.antlr:com.bitplan.antlr:jar:0.0.1
[WARNING] Reporting configuration should be done in <reporting> section, not in maven-site-plugin <configuration> as reportPlugins parameter. @ line 213, column 20
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
</pre>
You have run into an issue that is explained in:
* https://issues.apache.org/jira/browse/MNG-6189

= What to do? =
You get this error if your configuration looks like this:
<source lang='xml' highlight="9-11,20-21">
<project>
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.0</version>
        <configuration>
          <!-- configuration of reports to be included in site -->
          <reportPlugins>
            <plugin>
            <!-- report plugin 1 -->
            ...
            </plugin>
            <plugin>
            <!-- report plugin 1 -->
            ...
            </plugin>
          <reportPlugins>
        </configuration>
      </plugin>
    <plugins>
  </build>
</project>
</source>
Then you might want to create a new node '''<reporting></reporting>''' (it it does not exist yet) directly unter the '''<project><project>''' node:
<source lang='xml' highlight="2-3">
<project>
  <reporting>
  </reporting>
</project>
</source>
Now cut&paste the list of report plugins from the configuration above into it like this:
<source lang='xml' highlight="2-10">
<project>
  <reporting>
    <plugin>
      <!-- report plugin 1 -->
      ...
      </plugin>
      <plugin>
      <!-- report plugin 1 -->
      ...
      </plugin>
  </reporting>
</project>
</source>
In the plugins list in the build part only:
<source lang='xml' highlight="5-8">
<project>
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.0</version>
      </plugin>
    <plugins>
  </build>
</project>
</source>
is needed or if you have any non report configurations:
<source lang='xml' highlight="5-11">
<project>
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.6</version>
        <configuration>
        ...
        </configuration>
      </plugin>
    <plugins>
  </build>
</project>
</source>
= Example =
See https://github.com/BITPlan/com.bitplan.antlr/blob/master/pom.xml for a complete pom.xml example