Apache web server - viii Contents Chapter 8 Chapter 9 Chapter 10
viii Contents Chapter 8 Chapter 9 Chapter 10 Putting It All Together: Walking through a BMP Entity Bean s Life Cycle 177 Summary 180 Writing Container-Managed Persistent Entity Beans 181 Features of CMP Entity Beans 181 CMP Entity Beans Are Subclassed 181 CMP Entity Beans Have No Declared Persistent Fields 182 CMP Get/Set Methods Are Defined in the Subclass 184 CMP Entity Beans Have an Abstract Persistence Schema 186 CMP Entity Beans Have a Query Language 187 CMP Entity Beans Can Have ejbSelect() Methods 189 Implementation Guidelines for Container-Managed Persistence 191 Container-Managed Persistence Example: A Product Line 196 Product.java 197 ProductLocal.java 198 ProductHome.java 198 ProductLocalHome.java 200 ProductPK.java 201 ProductBean.java 203 The Deployment Descriptor 207 The Container-Specific Deployment Descriptor 210 Client.java 212 Running the Client Program 214 The Life Cycle of a CMP Entity Bean 214 Summary 216 Introduction to Message-Driven Beans 217 Motivation to Use Message-Driven Beans 217 The Java Message Service 219 Messaging Domains 220 The JMS API 222 Integrating JMS with EJB 226 What Is a Message-Driven Bean? 227 Developing Message-Driven Beans 231 The Semantics 231 A Simple Example 234 Advanced Concepts 241 JMS Message-Driven Bean Gotchas 244 Message Ordering 245 Missed ejbRemove() Calls 245 Poison Messages 246 How to Return Results Back to Message Producers 249 The Future: Asynchronous Method Invocations 254 Summary 254 Adding Functionality to Your Beans 255 Calling Beans from Other Beans 255 Default JNDI Lookups 256 Understanding EJB References 257
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