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

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[PersistenceUnit: JPA] Unable to configure EntityManagerFactory
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[PersistenceUnit: JPA] Unable to configure EntityManagerFactory
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Unable to configure EntityManagerFactory
javax.validation.ValidationException: Unable to find a default provider
at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:264)
at org.hibernate.cfg.beanvalidation.TypeSafeActivator.getValidatorFactory(TypeSafeActivator.java:380)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.hibernate.cfg.beanvalidation.BeanValidationActivator.applyDDL(BeanValidationActivator.java:118)
at org.hibernate.cfg.Configuration.applyBeanValidationConstraintsOnDDL(Configuration.java:1704)
at org.hibernate.cfg.Configuration.applyConstraintsToDDL(Configuration.java:1654)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1445)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1519)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:193)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1100)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:282)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:366)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
at caelum.virtual.gwt.server.GeraTabelas.main(GeraTabelas.java:26)

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