Q&A
by Peter Roxburgh, Andy Longshaw, Debbie Law, Dan Haywood, Martin Bond
Sams Teach Yourself J2EE™ in 21 Days
- Copyright
- About the Authors
- Acknowledgments
- Tell Us What You Think!
- Introduction
- Introducing J2EE and EJBs
- The Challenge of N-Tier Development
- The J2EE Platform and Roles
- Naming and Directory Services
- Naming and Directory Services
- Why Use a Naming Service?
- What is JNDI?
- Common Naming Services
- Naming Conventions
- Using JNDI
- Obtaining an Initial Context
- Initial Context Naming Exceptions
- Binding JNDI Objects
- JNDI Name Lookup
- Contexts
- More on JNDI Names
- Attributes
- More on Objects
- What Else Can JNDI Do?
- Summary
- Q&A
- Exercise
- Introduction to EJBs
- Session EJBs
- Overview
- The javax.ejb Package for Session Beans
- Stateless Session Bean Lifecycle
- Specifying a Stateless Session Bean
- Implementing a Stateless Session Bean
- Configuring and Deploying a Stateless Session Bean
- Stateful Session Bean Lifecycle
- Specifying a Stateful Session Bean
- Implementing a Stateful Session Bean
- Configuring and Deploying a Stateful Session Bean
- Client's View
- Patterns and Idioms
- Gotchas
- Summary
- Q&A
- Exercises
- Entity EJBs
- Overview
- The javax.ejb Package for Entity Beans
- Entity Bean Types
- Remote Versus Local Interfaces
- BMP Entity Bean Lifecycle
- Specifying a BMP Entity Bean
- Implementing a BMP Entity Bean
- Configuring and Deploying a BMP Entity Bean
- Client's View
- Session Beans Revisited
- Patterns and Idioms
- Gotchas
- Summary
- Q&A
- Exercises
- CMP and EJB QL
- Developing J2EE Applications
- Transactions and Persistence
- Java Message Service
- Messaging
- Java Message Service API
- JMS API Architecture
- Developing JMS Applications Using JBoss1
- Programming a JMS Application Using J2EE RI
- Point-to-Point Messaging Example
- Simple Synchronous Receiver Example
- The Publish/Subscribe Message Domain
- Publish/Subscribe Messaging Example
- Introduction to XML
- Summary
- Q&A
- Exercise
- Message-Driven Beans
- JavaMail
- Servlets
- The Purpose and Use of Servlets
- Introduction to HTTP
- Introduction to HTML
- The Servlet Environment
- The Servlet Class Hierarchy
- Simple Servlet Example
- Passing Parameter Data to a Servlet
- Web Applications
- Handling Errors
- Retaining Client and State Information
- Servlet Filtering
- Event Listening
- Servlet Threads
- Security and the Servlet Sandbox
- Agency Case Study
- Summary
- Q&A
- Exercises
- JavaServer Pages
- JSP Tag Libraries
- Integrating J2EE into the Enterprise
- Security
- Integrating XML with J2EE
- The Drive to Platform-Independent Data Exchange
- Origins of XML
- Structure and Syntax of XML
- Creating Valid XML
- Parsing XML
- The JAXP Packages
- Parsing XML using SAX
- Document Object Model (DOM) Parser
- Modifying a DOM Tree
- Java Architecture for XML Binding
- Extending the Agency Case Study
- Summary
- Q&A
- Exercises
- Transforming XML Documents
- Patterns
- Integrating with External Resources
- Using RPC-Style Web Services with J2EE
- Web Service Registries and Message-Style Web Services
- An Introduction to UML
- SQL Reference
- An Overview of XML
- The Java Community Process
- Glossary
- Index
Q&A
| Q1: | Why would it be pointless to deploy the getter of a multi-valued cmr-field using the RequiresNew transaction attribute? |
| A1: | This would be pointless because the returned collection cannot be used outside of the transaction in which it was materialized. |
| Q2: | What happens to the current transaction when an EJB throws an application exception? |
| A2: | The bean may or may not mark the transaction for rollback; consult the bean's documentation. |
| Q3: | When using SQLj Part 2, why should the Java class acting as an abstract data type define a static variable serialVersionUID? |
| A3: | To provide forward compatibility with future versions of the class. |
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