n-m relationship, 290
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