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Java Forum / JavaBeans / November 2003Home, Local/Remote interface
Hi everybody, I have been working for years with Perl and PHP, but I am new to J2EE. I would like to understand a bit how it works. I've read a few papers/tutorials, but all seem to assume what the home, local and remote interfaces are. Could someone explain it a bit, or point me to an page explaining it clearly. Thanks, Olivier, -- Olivier Georg __________________________ - d e d o m u l t i m e d i a - http://www.dedomultimedia.com > I have been working for years with Perl and > PHP, but I am new to J2EE. I would like to understand > a bit how it works. I've read a few papers/tutorials, > but all seem to assume what the home, local and > remote interfaces are. Home interfaces let you create instances of EJBs on the application server. EJBs are possibly remote, so "new BlaEJB()" does not work here. For Entity Beans, you will have methods to find instances in the home interface, at least by the bean's primary key. More methods recommended. The remote interface is one that extends javax.ejb.EJBObject (and java.rmi.Remote), it's methods may therefore be invoked from another machine. You put the methods that should be accessible for clients here, throwing RemoteException or a superclass in every method. When deploying, your application server creates a Skeleton that delegates calls to the actual bean. About the local interfaces - you still have this kind of instance hiding here (Client -> Delegate -- delegates to --> EJB), but it's call by reference again so there's no performance overhead. Johann  SignatureGeh' sterben, einfach strukturierter Junge. Du bist nur Aas, das nach Bestattung ächzt. ("Ray Banana" in <20021116225404.1251.qmail@gacracker.org>) > About the local interfaces - you still have this kind of instance hiding > here (Client -> Delegate -- delegates to --> EJB), but it's call by > reference again so there's no performance overhead. Local interfaces can be used if the caller is on the same VM. Local interfaces are necessary for Container-Managed Relationships. Marcus Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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