org.hibernate.MappingException: could not instantiate id generator

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could not instantiate id generator
org.hibernate.MappingException: could not instantiate id generator
at org.hibernate.id.IdentifierGeneratorFactory.getIdentifierGeneratorClass(IdentifierGeneratorFactory.java:108)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:91)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:182)
at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:23)

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