Get Arquillians Code Coverage Using JaCoCo - sonarqube

Question

I have a Maven build that runs Arquillian tests on a Wildfly. What I want to do is run JaCoCo as well so that I get a test coverage.
What I did to my working Arquillian setup: I changed the parent's pom.xml the following way:
<properties>
<sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
<jacoco.out.ut.file>../target/jacoco/jacoco-ut.exec</jacoco.out.ut.file>
<jacoco.out.it.file>../target/jacoco/jacoco-it.exec</jacoco.out.it.file>
<sonar.jacoco.reportPaths>${jacoco.out.ut.file},${jacoco.out.it.file}</sonar.jacoco.reportPaths>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<id>prepare-ut-agent</id>
<phase>process-test-classes</phase>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<destFile>${jacoco.out.ut.file}</destFile>
<propertyName>jacoco.agent.ut.arg</propertyName>
<append>true</append>
</configuration>
</execution>
<execution>
<id>prepare-it-agent</id>
<phase>package</phase>
<goals>
<goal>prepare-agent-integration</goal>
</goals>
<configuration>
<destFile>${jacoco.out.it.file}</destFile>
<propertyName>jacoco.agent.it.arg</propertyName>
<append>true</append>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<configuration>
<argLine>${test.argLine} ${jacoco.agent.it.arg}</argLine>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>${test.argLine} ${jacoco.agent.ut.arg}</argLine>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
That's a setup that works in multiple other projects (without Arquillian), so I assume it must work now, too.
For the module hosting the integration project I added the following:
<dependencies>
<dependency>
<groupId>org.jboss.arquillian.extension</groupId>
<artifactId>arquillian-jacoco</artifactId>
<version>1.0.0.Alpha9</version>
<scope>test</scope>
</dependency>
</dependencies>
The maven-surefire-plugin is called there (which is weird to me, but I tried maven-failsafe-plugin and it didn't work either).
When executed the module produces a jacoco.exec (which is 70kb for only the one module, so at least not empty). Sonar uses these files in the report generation. Still the code coverage gets displayed as 0%.
I found a couple tutorials on this topic, but they all seem to be missing a step (at least the setup is always identical to mine).
How do I get Arquillian to use JaCoCo to report the code coverage?