javax.persistence.PersistenceException: [PersistenceUnit: spontacts] Unable to configure EntityManagerFactory

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[PersistenceUnit: spontacts] Unable to configure EntityManagerFactory
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[PersistenceUnit: spontacts] Unable to configure EntityManagerFactory
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Unable to configure EntityManagerFactory
javax.persistence.PersistenceException: [PersistenceUnit: spontacts] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:265)
at org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:28)

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