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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 javax.validation.Validation.buildDefaultValidatorFactory(Validation.java:111)	at org.hibernate.cfg.beanvalidation.TypeSafeActivator.getValidatorFactory(TypeSafeActivator.java:380)	at org.hibernate.cfg.beanvalidation.TypeSafeActivator.applyDDL(TypeSafeActivator.java:109)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.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.cfg.Configuration.buildMappings(Configuration.java:1375)	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 org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)	at caelum.virtual.gwt.server.GeraTabelas.main(GeraTabelas.java:26)