Index_O

O

O/R mapping technologies

accessing relational databases, 315

CocoBase, 316

JDO (Java Data Objects), 315, 317

TopLink, 315

object comparisons

avoiding NullPointerExceptions, 156

object composition

concrete inheritance, 115

OO design principles summarized, 172

object driven modeling, 253-55

Object/Relational (O/R) mapping, 256

object modification

final classes, 155

Object/Relational (O/R) mapping, 255-57

data access design implications, 24

data access technologies, 25

EJB 2.0 entities, 299

entity beans, 274

impedance mismatch, 255

Observer design pattern, 122

OO design principles summarized, 173

without JMS, 234

observers, 123

see also listeners.

onlnit() method

hook method, 154

online seat reservation system

see sample application.

onMessage() method, 230

onSetContext() method, AbstractXmlcView class, 704

OO design principles

distributed architecture, 18

enterprise architecture goals, 16

implications of using EJB, 21

J2EE design, 678

JavaBeans, 138

recommendations for J2EE applications, 114-42

refactoring, 142

summarized, 171

Open Closed Principle, 154

optimistic locking

data access, 269

database locking, 302

OptimisticLockingViolationException class

JDBC abstraction framework, 329

optimization

code-level optimization, 614, 638

design-level optimization, 614

optimizing serialization to move data efficiently, 659

optimizing web tier session management, 489

avoiding unnecessary session state, 489

minimizing state data, 490

optimizing serialization, 490

using fine-grained session objects, 490

Oracle connection pool, creating, 602

Oracle database

sample application and, 200

Oracle-specific database calls

calling stored procedures using JDBC, 357

custom types, 359

OracleSQLException Translater class

converting JDBC exceptions to generic exceptions, 332

implements SQLException Translater interface, 332

vendor code, 332

org.apache.struts.action package, 458

Action class, 458

ActionForm class, 458

ActionSevlet class, 458

DispatchAction class, 461

Plugin interface, 465

B>org.apache.struts.util package

RequestUtils class, 459

org.infohazard.maverick package, 461

Dispatcher class, 461

org.infohazard.maverick.ctl package

ThrowawayBean2 class, 461

org.infohazard.maverick.flow package

CommandBase class, 462

Controller interface, 461

ControllerContext interface, 462

View inteface, 462

ViewContext inteface, 462

Orion

choosing application server, 53

overriding

final keyword, 153

making superclass methods final, 154