scanDirectory artifact exclusion

[ponziani]

We are using the Maven plugin with <exclude>*</exclude> and a configurated <scanDirectory>. Unfortunately one of the scanned artifacts results in

[ERROR] AnalysisException: An error occurred extracting evidence from org.apache.aries.javax.jax.rs-api-1.0.4.jar: geronimo-osgi-locator.jar, analysis may be incomplete; please see the log for more details.
[ERROR] caused by ZipException: Invalid CEN header (invalid extra data field size for tag: 0xbfef at 55)

It would be nice if we could exclude a directory and/or artifact from the directory scanning.