Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The affected method is org.codehaus.plexus.util.Expand.extractFile. The javacc package does not use the Expand class. It only uses classes in the org.codehaus.plexus.utils.xml and org.codehaus.plexus.utils.xml.pull subpackages.