Classpath for mojo

[Timothy Reilly]

Can anyone tell me the "best" way to get the project classpath from with
a plug-in including transitive dependencies?
 
I've tried mavenProject.getCompileClasspath() but it doesn't seem to
have the transitive deps
Some problem with mavenProject.getDependencies()
 
I think I need mavenProject.getArtifacts() but how do I resolve this to
paths to the local repository? 
Am I missing something much simpler like a component or property I can
just use?