Minor Description
org.apache.aries.jpa.container.impl.PersistenceBundleHelper.findPersistenceXmlFiles() scans bundles for persistence.xml files. Unlike most bundles, it scans WABs even if they contain no Meta-Persistence: header in their bundle manifest. If no persistence.xml is found, it issues the no.persistence.descriptor warning, "No persistence descriptors could be located in the bundle ...".
In practice this message is confusing a lot of people whose WABs don't contain persistence.xml files, and are not intended to. I propose to delete the warning altogether.