EJB Development with WebSphere Studio Application Developer IBM Director of Licensing, IBM Corporation, North Castle Drive Armonk, NY In the Java world, only the first two technologies stand out as especially. With Head First EJB, you'll learn not just what the technology *is*, but more If you don't already have an EJB compliant server, go to ronaldweinland.info and. Gerald Brose works as head of software development for Projektron, a soft- ware vendor that .. the first edition was one of the best technical books they've ever read. What's . Chapter 2 sets the scene for introducing the changes of EJB in. Chapter 3. cation, which is a PDF file downloadable from ronaldweinland.info Each.
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2. Section What is EJB all about? .. Welcome to EJB. Head First EJB™ By Bert Bates, Kathy Sierra ISBN: Publisher: O'Reilly. Prepared for. And because this is a Head First book, you'll learn how to think about thinking. As the second book in the Head First series, Head First EJB follows up the number one 2. Architectural Overview: EJB Architecture · You remember this picture. DOWNLOAD PDF In other words, if you use anything in Head First EJB™ to, say, run a nuclear power plant or air traffic control system, you're on your own. 2. EJB Architecture: architectural overview 3. Exposing Yourself: the client view.
As the industry standard for platform-independent reusable business components, EJB has just become Sun Microsystem's latest developer certification. Whether you want to be certifiable or just want to learn the technology inside and out, Head First EJB will get you there in the least painful way. And with the greatest understanding. You'll learn how to think like a server. You'll learn how to think like a bean.
Do we need handles with local interfaces? Do we need isIdentical with local interfaces? Do we need primary key information with local interfaces? Do we need remove methods with local interfaces?
When you think handle, think Remote Local clients dont need handles! Do you need isIdentical when theres equals? Local clients still need isIdentical Why so many remove methods? For Remote clients, two in the home, plus one in the component interface How can you use a remove that takes a handle when you dont have a handle?
Local clients dont have handles, so local homes dont have a remove that takes a handle.
Comparing Remote vs. Local interfaces Writing the local client interfaces You can have both a Remote and local client view for a bean, but you probably wont.
Exceptions in client interfaces: what the client might get Local client code What has to change inside the bean class?
Arguments to Remote vs. Getting and using a stateful session bean Theres obviously more to the beans lifecycle than just creation and business methods Container Callbacks, for the special moments in a beans life EJB Architecture You remember this picture What about arguments and return values?
What really gets passed when you pass an object to a remote method? Passing a Remote object through a remote method call What must the Remote object and the stub have in common? In other words, who makes the EJBObject class? Who creates what?
The bean Home Architectural overview: Session beans Architectural overview: Entity beans Architectural overview: Creating a Stateful Session bean Architectural overview: Creating a Stateless Session bean Who creates the stateless session bean, and when? Stateless session beans are more scalable Architectural overview: Message-driven beans 3. The Client View: Exposing Yourself What the client really wants It all starts with the home interface How a client uses a session bean: But NO.
You have to narrow the object as well!
The component interface. Imagine what else you might want to do with your EJB object reference Online shopping should not be rushed Do we need handles with local interfaces?
Do we need isIdentical with local interfaces? Do we need primary key information with local interfaces?
Do we need remove methods with local interfaces? Local clients still need isIdentical Why so many remove methods?
Comparing Remote vs. Exceptions in client interfaces: Arguments to Remote vs. Mock Exam Answers 4. Session Bean Lifecycle: Being a Session Bean Exploring the session bean lifecycle You remember how it all works, right?
Bean things you can do within business methods Passivation: Your job for passivation: Bean things you can do in ejbActivate and ejbPassivate Bean Removal: Mock Exam Answers 5. Entity Bean Intro: Entities vs. What does the client really want from an entity bean home? Entity bean Remote home interface When finders have a dark side Home business methods to the rescue Session bean create vs.
Mock Exam Answers 6. Entity beans have new home container callbacks, too Writing a CMP entity bean: Virtual fields are NOT instance variables! Bean things you can do during entity construction: Object identity: Bean things you can do in home business methods Bean things you can do during activation and loading Bean things you can do during passivation and storing Coffee Cram: Mock Exam Answers 7. Entity Relationships: Relationships and multiplicity Multiplicity in Bean Classes Multiplicity affects return type!
Mock Exam Answers 8. Message-Driven Beans: Getting the Message Imagine this scenario Message-driven bean class Writing a message-driven bean: Think about it. Mock Exam Answers 9.