probleme d'execution appli sous HIBERNATE

Bonjour,

Je compile ça fonctionne mais on faisant run donne une erreur que je vois pas dou ça viens:

voici la partie derreur, qui est dans classe EventManager ou HibernateUtil mais ces deux classes sont tres simpes et pourtant il donne erreur
merci de me dire si vous avez deja rencontrer cette erreur

Code:

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    [java] 02:59:21,437  INFO SettingsFactory:210 - Cache region prefix: hibernate.test
     [java] 02:59:21,437  INFO SettingsFactory:214 - Structured second-level cache entries: enabled
     [java] 02:59:21,437  INFO SettingsFactory:222 - Echoing all SQL to stdout
     [java] 02:59:21,437  INFO SettingsFactory:226 - Statistics: disabled
     [java] 02:59:21,437  INFO SettingsFactory:230 - Deleted entity synthetic identifier rollback: disabled
     [java] 02:59:21,437  INFO SettingsFactory:244 - Default entity-mode: pojo
     [java] Initial SessionFactory creation failed.java.lang.IllegalAccessError
     [java] Exception in thread "main" java.lang.ExceptionInInitializerError
     [java] at util.HibernateUtil.<clinit>(Unknown Source)
     [java] at events.EventManager.main(Unknown Source)
     [java] Caused by: java.lang.IllegalAccessError
     [java] at net.sf.cglib.core.ClassEmitter.setTarget(ClassEmitter.java:85)
     [java] at net.sf.cglib.core.ClassEmitter.<init>(ClassEmitter.java:77)
     [java] at net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:197)
     [java] at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:63)
     [java] at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:192)
     [java] at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:177)
     [java] at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:149)
     [java] at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:142)
     [java] at org.hibernate.impl.SessionFactoryImpl.<clinit>(SessionFactoryImpl.java:315)
     [java] at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1055)
     [java] ... 2 more
     [java] Java Result: 1
BUILD SUCCESSFUL
Total time: 1 second