Using and Understanding Java Data Objects

Nested exceptions, getting, 251

newObjectIdInstance method, 97, 242

newQuery methods, 48–49, 71

No-arg constructor, 150

in every application data class, 151–152

example, 152

primary key and, 245

prime user of, 151

Nondurable identity, 23, 31–32

class requirements, 31–32

uniqueness requirement and, 34–35

Nonrepeatable read, explained, 107

NontransactionalRead (NTR), 18, 86, 113–114, 122–125, 341

NontransactionalWrite (NTW), 114, 122–124

NoSuchElementException, 40, 47, 262

null (keyword), 51

Null values

checking for, 51

handling in method parameters, 76

processing, 76–77

NullPointerException, 53, 76, 262

Number types, 53

Numeric values, literal, 51