Using and Understanding Java Data Objects

overriding, 352–354

for rental object, 352–353

HashSet object, 151

HashSet transactional field, 145

hasSubclasses method (Extent interface), 40

Heffalump example class, 26–28

help command, 283, 291

Helpers, 227–234

Hierarchy

derived class in, 229

for JDO exceptions, 255

Hollow object

refreshing, 95

retrieving, 92

Hollow state, 19, 21

HTTP protocol, 332

HttpServletRequest object, 342

HttpSession objects, 332, 335, 339, 344, 354

HttpSessionActivationListener interface, 354

HttpSessionBindingListener interface, 354