Hibernate - Erro ao instanciar PojoEntityTuplizer

Assuntos Gerais
#1

Galera, estou estudando hibernate e estou tendo o seguinte erro:

Exception in thread "main" org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:110)
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:135)
	at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:56)
	at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:323)
	at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:433)
	at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
	at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
	at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:231)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1313)
	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
	at s2.configuration.ConnectionFactory.getSessionFactory(ConnectionFactory.java:15)
	at s2.configuration.ConnectionFactory.getSession(ConnectionFactory.java:22)
	at s2.application.Application.main(Application.java:11)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:107)
	... 12 more
Caused by: java.lang.NoClassDefFoundError: net/sf/cglib/proxy/CallbackFilter
	at org.hibernate.bytecode.cglib.BytecodeProviderImpl.getProxyFactoryFactory(BytecodeProviderImpl.java:33)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactoryInternal(PojoEntityTuplizer.java:208)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:186)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:128)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:78)
	... 17 more
Caused by: java.lang.ClassNotFoundException: net.sf.cglib.proxy.CallbackFilter
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 22 more

Se alguém puder me ajudar desde já agradeço.

#2