run console app - run main class of "HibernateA01" module. see one to one relationship - run main class of "part2(HibernateA01_1to1)" module. see one to many relationship - run main class of "part2(HibernateA01_1toM)" module. see many to many relationship - run main class of "part2(HibernateA01_MtoM)" module.