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Exception preparing module: EJBModule(snapshot31.jar) [EJB:011023]An error occurred while reading the deployment descriptor. The error was:
weblogic.deployment.EnvironmentException: Error processing persistence unit VakkoEJBModel of module ejb1.jar: Error instantiating the Persistence Provider class org.hibernate.ejb.HibernatePersistence of the PersistenceUnit VakkoEJBModel: java.lang.ClassNotFoundException: org.hibernate.ejb.HibernatePersistence	at weblogic.deployment.BasePersistenceUnitInfoImpl.getPersistenceProvider(BasePersistenceUnitInfoImpl.java:375)	at weblogic.deployment.BasePersistenceUnitInfoImpl.initializeEntityManagerFactory(BasePersistenceUnitInfoImpl.java:393)	at weblogic.deployment.BasePersistenceUnitInfoImpl.initializeEntityManagerFactory(BasePersistenceUnitInfoImpl.java:386)	at weblogic.deployment.BasePersistenceUnitInfoImpl.(BasePersistenceUnitInfoImpl.java:158)	at weblogic.deployment.PersistenceUnitInfoImpl.(PersistenceUnitInfoImpl.java:39)	at weblogic.deployment.AbstractPersistenceUnitRegistry.storeDescriptors(AbstractPersistenceUnitRegistry.java:349)	at weblogic.deployment.AbstractPersistenceUnitRegistry.loadPersistenceDescriptor(AbstractPersistenceUnitRegistry.java:263)	at weblogic.deployment.ModulePersistenceUnitRegistry.(ModulePersistenceUnitRegistry.java:69)	at weblogic.ejb.container.deployer.EJBModule.setupPersistenceUnitRegistry(EJBModule.java:223)	at weblogic.ejb.container.deployer.EJBModule$1.execute(EJBModule.java:324)	at weblogic.deployment.PersistenceUnitRegistryInitializer.setupPersistenceUnitRegistries(PersistenceUnitRegistryInitializer.java:62)	at weblogic.ejb.container.deployer.EJBModule.prepare(EJBModule.java:393)