maven JaCoCo for site phase only - maven

Question

We have JaCoCo working in our POM and it runs and reports every time we run clean install.
What we would really like to do is only run JaCoCo when a maven site is run.
I have tried adding:
...
<configuration>
<skip>${jacoco.skip}</skip>
....
And setting jacoco.skip to true for the build phase, but in the reporting section, I have added:
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.5.201505241946</version>
<configuration>
<skip>false</skip>
<dataFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</dataFile>
...
But this does not work. Setting jacoco.skip to true does prevent JaCoCo running on normal maven clean install's but also appears to affect the reporting.
Question: How would I configure maven so that JaCoCo runs successfully for a maven site, but does not run for a mvn clean install?

Answer 1

The simplest way is to delegate it to a Maven profile, removing its configuration for your build section and placing it into a profile as following:
<profiles>
<profile>
<id>jacoco</id>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.1.201405082137</version>
<configuration><!-- here --></configuration>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.1.201405082137</version>
</plugin>
</plugins>
</reporting>
</profile>
</profiles>
You can then add your custom configuration there.
Then normal builds will not apply it, while you could always activate it via:
mvn clean install -Pjacoco
or
mvn site -Pjacoco