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 app. 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 apps, 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 app 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 app server, 53 overriding final keyword, 153 making superclass methods final, 154
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