Current fix has still one issue. Only direct maven dependencies without transitive are on classPath . Look at test case test-enhance-maven-plugin3.zip .
I think that in MavenEnhancePlugin.java in line 166 should be

for ( Artifact a : project.getExecutionProject().getArtifacts() ) {

instead of

for ( Artifact a : project.getDependencyArtifacts() ) {