JPA - PersistenceUnitLoadingException

[chehilbi]

Hallo zusammen,

bei der Verwendung von JPA erhalte ich aus heiterem Himmel die nachfolgende Fehlermeldung. Hat irgendetwas mit der persistence.xml oder den benötigen libs zu tun. Wer kann mir helfen?


Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.PersistenceUnit LoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@5e73e0d
Internal Exception: Exception [EclipseLink-30009] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.PersistenceUnit LoadingException
Exception Description: An exception was thrown while trying to load persistence unit at url: file:/C:/Testprojekt/build/classes/
Internal Exception: Exception [EclipseLink-30004] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.PersistenceUnit LoadingException
Exception Description: An exception was thrown while processing persistence.xml from URL: file:/C:/Testprojekt/build/classes/
Internal Exception:
(1. URI was not reported to parser for entity [document])