How to use checkstyle:check in a multi module project - maven

Question

I'm trying to use Maven Checkstyle plugin in a multi module project.
The default setting for <sourceDirectories> (where the plugin to start looking for code) is ${project.compileSourceRoots}. This resolves to [C:\workspace\projectname\src\main\java] in my case, i.e. a List<String>.
Now, that default path is of no value to me, since my code resides in different places, like so: [C:\workspaces\projectname\module1\src\main\java]. Hence, I need to change <sourceDirectories> to a list of directories where my code actually is.
So far, so good...
The problem is that <sourceDirectories> expects a List<String>. I tried the following:
<sourceDirectories>
<sourceDirectory>pathToCode1</sourceDirectory>
<sourceDirectory>pathToCode2</sourceDirectory>
</sourceDirectories>
... but that didn't work. It will take the default path. (Moreover, <sourceDirectory> is deprecated!)
Having only one <sourceDirectory> (without the surrounding <sourceDirectories>) does work, but <sourceDirectory> only takes one path and you can't have more than one <sourceDirectory>. So, no cigar. Also, keep in mind <sourceDirectory> is deprecated.
I also tried various other methods of providing a List<String> to <sourceDirectories>, but alas, no progress. Here are some examples:
<sourceDirectories>[pathToCode]</sourceDirectories>
<sourceDirectories>pathToCode</sourceDirectories>
<sourceDirectories>{pathToCode}</sourceDirectories>
<sourceDirectories>{[pathToCode]}</sourceDirectories>
<sourceDirectories>{{pathToCode}}</sourceDirectories>
<sourceDirectories>{{{pathToCode}}}</sourceDirectories>
Is there another way of (directly, without "sub-tags") providing a List<String> to maven?
Is the plugin broken?
Have I missed something?
Edits below
My project structure:
MyProject
|-- pom.xml <-- plugin runs fine here
|-- domain-module
| |-- src
| | `-- main
| | `-- com/example/hello...
| | |-- TheCode.java
| | `-- resources
| | |-- checkstyle.xml
| | `-- LICENSE.TXT
| `-- pom.xml
|-- poms
| |-- parent
| | `-- pom.xml <-- this is my parent pom
My parent pom
<dependencies>
<dependency>
<groupId>com.puppycrawl.tools</groupId>
<artifactId>checkstyle</artifactId>
<version>${checkstyle.version}</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>2.16</version>
<dependencies>
<dependency>
<groupId>com.example.hello</groupId>
<artifactId>domain-module</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
<executions>
<execution>
<id>validate</id>
<phase>validate</phase>
<configuration>
<configLocation>domain-module/src/main/resources/checkstyle.xml</configLocation>
<encoding>UTF-8</encoding>
<consoleOutput>true</consoleOutput>
<failsOnError>false</failsOnError>
<failOnViolation>true</failOnViolation>
<violationSeverity>warning</violationSeverity>
<logViolationsToConsole>true</logViolationsToConsole>
<skip>false</skip>
</configuration>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
<...>
</build>
</pluginManagement>
</plugins>

Answer 1

Since version 2.13 the use of sourceDirectories is broken (https://issues.apache.org/jira/browse/MCHECKSTYLE-260).
With 2.12 it works. Andreas Dangel mentioned in Jira:
The configuration described here
Checkstyle - Exclude folder
still works. Then the exclusion happens in checkstyle, rather than in
maven-checkstyle-plugin.