Regarding updating pom file - maven

Question

I am working on a continuous integration tool and here i need to integrate jacoco plugin after checking out. I do not want to enforce developer to add jacoco plugin while checkin instead i would like to add it while running the jenkins based continuous integration tool.
Is it possible to achieve any of these options?:
1. to modify the pom file checked in by the developer and inject the dependency and plugin required for jacoco?
OR
to add the jacoco plugin super pom and mention that in jenkins configuration.
I tried this super pom approach, and it was reading super pom from a common repository, but not generating jacoco-exec file. I used below in super pom.
http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
pom
<dependencies>
<dependency>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.6.201602180812</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.6.201602180812</version>
<configuration>
<destFile>${basedir}/target/jacoco-unit.exec</destFile>
<dataFile>${basedir}/target/jacoco-unit.exec</dataFile>
</configuration>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Any help will be appreciated. Thanks

Answer 1

You can create a separate profile in the pom.xml, name it as jenkins profile and include jacoco plugin in that profile. You can then configure the mvn command in your jenkins job to include -P jenkins_profile_name. So the build would be done using the jenkins profile configuration.
Mark the existing profile as default and developers won't need to do anything specific.
For more details, refer to maven documentation for build profiles:
http://maven.apache.org/guides/introduction/introduction-to-profiles.html