Using Perforce
The maven-changelog-plugin uses Maven SCM as an underlying layer, when accessing your SCM system. When Maven SCM is working with Perforce it needs a clientspec. This is provided by setting system properties that are then read by Maven SCM.
Configuring this is done in the same way as for the maven-scm-plugin. So if you have a working configuration for maven-scm-plugin, you can just copy those lines over to your maven-changelog-plugin configuration. The following configuration shows an example of what this can look like.
<project>
...
<reporting>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-changelog-plugin</artifactId>
<version>3.0.0-M1</version>
<configuration>
<systemProperties>
<property>
<name>maven.scm.perforce.clientspec.name</name>
<value>your.perforce.clientspec.name</value>
</property>
</systemProperties>
</configuration>
</plugin>
</plugins>
</reporting>
...
</project>


