Using and Understanding Java Data Objects

Unchecked exceptions, 249–250, 252–253

Unconstrained variables, 56–57, 60

Unique identity values, 80

Unique primary keys, 26

Uniqueness requirement, 21–36

and application code, 34

conditions for, 33

and nondurable identity, 34–35

Unmanaged collections, 248

Unmanaged data objects, 15–16

Unmanaged fields, 9, 144–147, 240–241

Unmanaged objects, 4, 7–17, 81

application obtaining, 89

enhancement and, 16

JDO exceptions and, 253

making, 86–88

of persistence-capable classes, 15

use of term in this book, 15–17

Unmanaged persistent application data object, 339–340

Unmanaged state, 19

unsetEntityContext method (entity bean), 214

UnsupportedOperationException, 40, 46, 262

UPCs (for retail products), 244

Update locks, 107

Update service, 3

Updating of the datastore (implicit), 7

Updating persistent objects, 6–7

Use cases for rental Swing app, 302–306

UserObject property (PersistenceManager interface), 100, 239

UserTransaction interface, 136–137, 201