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log4j (continued) jdbc 257 JDBC appender 257 Location Info 252 making reports 257 performance 254 refreshing configuration 267 rolling file appender 260 sample configuration 250 sorting messages by client 269 to HTML 261 to JMS 258 XML file log 259 logconfig.properties 250 LogConsolidatorBean 263 Logger.getLogger 249 LoggerInitializationServlet 268 logging 247 format characters 253 formatting messages 251 making reports 257 performance 254 to a database 257 to an XML file 259 to HTML 261 to JMS 258 to XML 259 tracking EJB lifecycle 265 LoginBean 8 LoginHome 13 LoginServlet 9 10 lookup 135 env vars 135

@Entity @Table(name = "ITEMS") public class Item implements Serializable { @Id private Long itemId; private String title; ... @OneToOne(fetch = FetchType.LAZY) @PrimaryKeyJoinColumn(name = "ITEM_ID", referencedColumnName = "ITEM_DETAIL_ID") private ItemDetails itemDetails; } @Entity @Table(name = "ITEM_DETAILS") public class ItemDetails implements Serializable { @Id private Long itemDetailsId; private String originalPurchaseDate; @Lob private byte[] itemPicture; ... }

This change gives us the performance we are looking for, and helps us overcome the reality that not all implementations of the EJB 3 specification are done the same way. This way, we remain neutral with respect to application server vendors, and therefore our application is more portable across persistence provider implementations. Choosing the right inheritance strategy As you learned in chapter 8, EJB 3 supports three type of inheritance mapping strategies. Each has its own advantages and disadvantages, but the single-table strategy will probably give you the best performance. This is because all entities are stored in a single table and JOINs between tables are avoided. As discussed in chapter 8, we can create a single table named USERS for User and all its subclasses such as Bidder, Seller, Admin, etc., and use a discriminator column to track the subtypes. Consider the following:

managing EJB state after a rollback 183 managing EJB state at transaction boundaries 179 Mandatory 168 Map 126 MapMessage 199 Mapped Diagnostic Context 271 <max-beans-in-free-pool> 208 MDC 271 message filters 219 message queue 200 message selectors 73, 219 MessageBean 16 17, 154, 207, 209, 214, 217, 219, 222

However, when a system already natively supports a configuration level (such as the Spring bean configuration level), the aspect concept is not needed It emerges from some configuration holding pointcuts and advice..

@Table(name = "USERS") @Inheritance(strategy = InheritanceType.SINGLE_TABLE)

@DiscriminatorColumn(name = "USER_TYPE", discriminatorType = DiscriminatorType.STRING, length = 1) Configures public class User ...

MessageBean2 214 MessageBeanTemplate 142 MessageDriveBean 204 <message-driven> 202 203 message-driven beans business logic 209 creating 202 deployment descriptor 203 email 223 error handling 221 for centralizing logging 263 handling rollbacks 225 pool of 208 security 204, 242 superclass 142 using message selectors 219 MessageDrivenBean 203 MessageDrivenContext 203 <message-drivendescriptor> 215 <message-drivendestination> 204 MessageListener 15, 203 <message-selector> 220 method permissions 64, 235 generating XML 45 method that compares EJB references 24 <method-intf> 237 <method-permission> 236 237 Microsoft Excel 267 modeling one-to-one entity data relationships 97 MyService 158

@Entity @DiscriminatorValue(value = "S") public class Seller extends User ... @Entity @DiscriminatorValue(value ="B") public class Bidder extends User

Recall that a pointcut is a set of code locations, called joinpoints, where an aspect can be woven. This idea is central in AOP. Pointcuts define the crosscutting nature of an aspect. A pointcut talks about the application and designates strategic locations where an aspect applies.

Notice c that discriminatorType has a data type of DiscriminatorType.STRING and a length of 1. These are set in conjunction with the inheritance strategy b of SINGLE_TABLE. This means that you can assign the actual value as a Java String type, but the value will be whatever your application decides to use for the various subtypes supported. In this case "S" is used to represent a Seller d and "B" represents a Bidder e. But then you already figured that out, didn t you