Beginning Java EE 6 with GlassFish 3, Second Edition

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CHAPTER 7 ■ SESSION BEANS AND THE TIMER SERVICEYou cannot mark the same interface with more than one annotation. The session beans that youhave seen so far in this chapter have no interface. The no-interface view is a variation of the local viewthat exposes all public business methods of the bean class locally without the use of a separate businessinterface.Listing 7-9 shows a local interface (ItemLocal) and a remote interface (ItemRemote) implemented bythe ItemEJB stateless session bean. With this code, clients will be able to invoke the findCDs() methodlocally or remotely as it is defined in both interfaces. The createCd() will only be accessible remotelythrough RMI.Listing 7-9. Stateless Session Bean Implementing a Remote and Local Interface@Localpublic interface ItemLocal {List findBooks();List findCDs();}@Remotepublic interface ItemRemote {List findBooks();List findCDs();Book createBook(Book book);CD createCD(CD cd);}@Statelesspublic class ItemEJB implements ItemLocal, ItemRemote {...}Alternatively to the code in Listing 7-9, you might specify the interface in the bean’s class. In thiscase, you would have to include the name of the interface in the @Local and @Remote annotations asshown in Listing 7-10. This is handy when you have legacy interfaces and need to use them in yoursession bean.Listing 7-10. A Bean Class Defining a Remote and Local Interfacepublic interface ItemLocal {List findBooks();List findCDs();}public interface ItemRemote {List findBooks();List findCDs();Book createBook(Book book);CD createCD(CD cd);}216
CHAPTER 7 ■ SESSION BEANS AND THE TIMER SERVICE@Stateless@Remote (ItemRemote.class)@Local (ItemLocal.class)public class ItemEJB implements ItemLocal, ItemRemote {...}Web Services InterfaceIn addition to remote invocation through RMI, stateless beans can also be invoked remotely as SOAPweb services or RESTful web services. Chapters 14 and 15 are dedicated to web services, so I won’tdescribe them here. I just want to show you how a stateless session bean can be accessed in variousforms just by implementing different annotated interfaces. Listing 7-11 shows a stateless bean with alocal interface, a SOAP web services endpoint (@WebService), and a RESTful web service endpoint(@Path). Note that these annotations come respectively from JAX-WS and JAX-RS and are not part of EJB.Listing 7-11. A Stateless Session Bean Implementing Several Interfaces@Localpublic interface ItemLocal {List findBooks();List findCDs();}@WebServicepublic interface ItemSOAP {List findBooks();List findCDs();Book createBook(Book book);CD createCD(CD cd);}@Path(/items)public interface ItemRest {List findBooks();}@Statelesspublic class ItemEJB implements ItemLocal, ItemSOAP, ItemRest {...}Bean ClassA session bean class is any standard Java class that implements business logic. The requirements todevelop a session bean class are as follows:217
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The EXPERT’s VOIce ® in Java tm
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Beginning Java EE 6 Platform with G
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Contents at a Glance■Foreword ...
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■ CONTENTSSummary ...............
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■ CONTENTSBulk Update ...........
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■ CONTENTSStateful . ............
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■ CONTENTSScripting Elements ....
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■ CONTENTSMDB Model .............
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■ CONTENTSFrom the Web to Web Ser
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About the Author■ Antonio Goncalv
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AcknowledgmentsWriting a book about
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■ PREFACECONTENTSChapter 1 briefl
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C H A P T E R 1■ ■ ■Java EE 6
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CHAPTER 1 ■ JAVA EE 6 AT A GLANCE
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CHAPTER 2 ■ JAVA PERSISTENCEJPA S
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CHAPTER 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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CHAPTER 4 ■ MANAGING PERSISTENT O
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CHAPTER 9 ■ TRANSACTIONS AND SECU
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C H A P T E R 11■ ■ ■Pages an
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CHAPTER 11 ■ PAGES AND COMPONENTS
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CHAPTER 12 ■ PROCESSING AND NAVIG
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CHAPTER 15 ■ RESTFUL WEB SERVICES
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■ INDEXApache Maven. See Mavenapp
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