ERROR - springframework.DataAccessResourceFailureException - Possible Causes of DataAccessResourceFailureException

Exception Thrown By:Cause
ClassMethod
EntityManagerFactoryUtils public static EntityManager
getTransactionalEntityManager(EntityManagerFactory emf)
if the
EntityManager couldn't be obtained.
OpenSessionInViewInterceptor public void
afterConcurrentHandlingStarted(WebRequest request)
if the Session
could not be created