...
<groupId>org.codehaus.mojo</groupId>
<artifactId>rpm-maven-plugin</artifactId>
<version>2.1-alpha-3</version>
...
<mapping>
    <directory>/etc/init.d/</directory>
    <softlinkSource>
        <location>/opt/activemq/bin/activemq</location>
    </softlinkSource>
</mapping>
...
Compiled with error: ...Cannot find setter, adder nor field in org... for 'softlinkSource'...
I find codehaus jira with same bug: http://jira.codehaus.org/browse/MRPM-82
It is fixed in my version.
                        
this is right code