java.lang.ClassNotFoundException: org.hibernate.MappingException
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at org.netbeans.modules.j2ee.persistence.util.CustomClassLoader.loadClass(CustomClassLoader.java:120)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Caused: java.lang.NoClassDefFoundError: org/hibernate/MappingException
   at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:124)
   at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
   at org.netbeans.modules.j2ee.persistence.jpqleditor.JPQLExecutor.execute(JPQLExecutor.java:131)
   at org.netbeans.modules.j2ee.persistence.jpqleditor.JPQLEditorController$2.run(JPQLEditorController.java:132)