EAR deployment advantages, 584 alternatives to EAR deployment, 584 app.xml file, 584 disadvantages, 584 EJB JAR files, 584 JCA Resource Adapters, 584 packaging sample apps, 593 WARs, 584 Eclipse IDE JUnit framework, 84 refactoring, 142 web site, 64 ECPerf choosing app server, 49 edge side includes see ESI. edge site caching Akamai, 671 Dynami, 671 ESI, 671 web tier performance, 671 EIS (Enterprise Information System) tier, 27 EJB (Enterprise JavaBeans) accessing, 417 Business Delegate pattern, using, 423 direct EJB access, disadavantages, 417 JMS, using, 425 local vs.remote access, 417 Service Locator pattern, using, 418 transparent dynamic proxy, using, 422 authorization, 213 both local and remote interfaces, 224 Cactus testing tool, 99 CMT attributes, listing, 382 compared to TopLink, 315 component interface & bean implementation class. synchronizing, 386 business methods interface ‘pattern’, using, 386 consuming messages, 229-32 data access in EJB tier, 273 declarative configuration management, 214 EJB (Enterprise JavaBeans) continued disadvantages of, 214-22 entity beans in EJB 2.0, 294 error handling, 379 exceptions, listing, 381 how to use, 223-27 implementing, 410 abstract superclasses, deriving EJBs from, 410 distributed architecture, implementing, 209 SessionBean, implementing, 413 interface summary, 226 J2EE concerns related to EJB, 21, 676 load testing, 106 local interfaces, 99 logging in EJB tier, 165 O/R mapping limitations, 299 objectives, 223 phoney remote interfaces, 225 programming restrictions, 215 pros and cons of using in J2EE app, 22 read-only entity beans, 222 remote interfaces, 99 sample app, 222, 227 Singleton design pattern, 222 state management, 26 testing business objects, 93-100 transaction management, 210-13 use of, 19-24 when to use, 209-23 EJB class loader, 586 EJB Command design patterns, 374 implementing in distributed J2EE apps using SLSB, 374 advantages & disadvantages, 377 Command objects, constructing/executing, 375 Command/~Executor example, 375 CommandExecutor interface required, 375 executeCommand() from client-side, example, 377 using commands without EJB Command, example, 378 implications of using EJB, 21 moving data to operation, 656 EJB containers entity beans guidelines, 307 scheduling, 222 EJB JAR files, 584 compared to WARs, 595 description, 584 EAR deployment, 584 packing sample apps, 594 EJB QL (EJB Query Language), 39 code portability, 264 EJB 2.0 CMP, 298 problems with, 298 SQL compared, 298 <b>ejbActivate() method EJB cannot invoke on SLSB, 414 SFSB reactivation, implementing, 367 example, 367 EJBContext interface, javax.ejb, 386 setRollbackOnly() method, 386 sub-interfaces, 386 ejbCreate() method, 230, 292 business interfaces, implementing, 433 defined as abstract, 414 method naming, 295 SFSB passivation/reactivation example, 367 SLSB (stateless session beans) pooling, 365 EJBException runtime wrapper exception, javax.ejb, 381 EJBGen code generator, 66, 306 ejbHome() methods entity beans guidelines, 307 method naming, 295 ejbLoad() method, 303 data loading and storage, 300 database locking, 302 persistence, 292 ejbPassivate() method EJB cannot invoke on SLSB, 414 SFSB passivation, implementing, 366 example, 367 ejbRemove() method, 292 ejbSelect() method CMP entities, 295 home interface business methods, 300 EJB-specific configuration proprietary deployment descriptors, 599 ejbStore() method, 303 data loading and storage, 300 entity state, 301 persistence, 290, 292 EL see Expression Language. Embeded SQL SQLJ structure, 313 encapsulation multiple parameters, 124 endline comments, 160 Enterprise Archive deployment see EAR deployment. entity beans BMP or CMP, 292 BMP/CMP hybrids and persistence, 300 business logic, 290 caching, 300 caching for performance, 246 compared to JDO, 317 concerns, 286 container managed relationships, 296 data access, 274, 285-308 data access technologies, 25 definition, 287 EJB 2.0 CMP, 296 EJB 2.0 enhancements, 294 fine or coarse grained, 288 granularity debate, 288 guidelines summary, 307 hand authoring, 306 home interface business methods, 295 locking strategies, 301-2 objectives, 286 performance, 19, 305 read-mostly entities, 302 read-only entities, 302 remote interfaces, 295 reservations, 308 sequence entity beans, 271 session bean mediation, 291 session beans accessing, 287 tool support, 306 error handling, 379 see also exception handling, avoiding NullPointerExceptions, 157 EJB, 379 app/system exceptions, handling, 380 exceptions, listing, 381 session bean design/implementation guidelines, 380 improving error messages, 77 JSP custom tags, 495 refactoring, 142 sample app user interface, 185 test cases, 80 error return codes checked exceptions compared, 127 Errors Interface, com.Interface21.validation package, 498 rejectValue() method, 498 ESI edge site caching, 671 Java support for ESI, 671 events listeners, 123 exception handling, 125-32 see also error handling. appException class, 321 chainable exceptions, 130 declarative exception handling, 461 good pratice, 128 J2EE exceptions, 130 Java tutorial, 125 JDBC (Java DataBase Connectivity), 320 problems with, 327 JDBC abstraction framework, 327, 334 DataAccessException class, 328 JDBC specific exceptions, 329 converting JDBC exceptions to generic exceptions, 331 making exceptions informative, 131 MDBs, 230, 231 nested exceptions, 130 DataAccessException class, 328 protecting interface code, 131 SQLException class, 320, 322, 327 limitations, 327 SQLWarning class, 323 exceptions app/system, EJB handling, 380 checked exceptions, 328 EJB exceptions, listing, 381 GreateException/Remove~, 381 EJBException, 381 finderException, 382 expected behavior, 80 runtime exceptions, 328 unchecked exceptions, 110 exclusive locking, 301 execute() method, Action class, 458 parameters, 458 execute() method, Action Interface, 463 execute() method, AvailabilityQuery class, 326 execute() method, Command Interface, 375 EJB Command, implementing using SLSB, 375 example, 376 execute() method, Query Interface, 318 execute() method, SqlQuery class, 345, 357, 645 executeCommand() method, CommandExecutor Interface, 375 EJB Command, implementing using SLSB, 375 client-side execution example, 377 example, 376 Expires header cache control HTTP headers, 666 exposeModelsAsContextAttributes() method, VelocityView class, 693 exposeModelsAsRequestAttributes() method, InternalResourceView class, 690 Expression class TopLink, 316 Expression Language JSTL, 533 syntax, 542 extended deployment units packaging J2EE apps, 585 extensibility decoupling components, 122 enterprise architecture goals, 17 using callbacks, 120 extension mechanism for Java see Java 1.3 extension mechanism. Externalizable Interface, Java.io package custom serialization, 661 readExternal() method, 661 writeExternal() method, 661 extract() method, ManualExtractionSqlQuery class, 345 performing queries, 348
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