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Portable remote object

 
Hari babu
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Hi all,
Why do we need to use Portable RemoteObject ?
I read that the ejb supports RMI over IIOP and RMI over IIOP is CORBA + JAVA standard. Why is EJB using IIOP ?
Thanks in advance
Hari
 
Chris Mathews
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We need PortableRemoteObject because some languages do not allow casting and to support this IIOP only allows stubs to implement a single interface. Since Context.lookup() returns an Object, the stub will only implement methods from Object.
PortableRemoteObject gives us a way to cast a general Object to a more specific type, in a protocol independent manner. Thus it will work with RMI-IIOP, T3, RMI, etc...
J2EE uses RMI-IIOP to allow interoperability with existing Corba systems. IIOP is also a more widely recognized protocol than RMI, hence it is more likely to be allowed thru firewalls. It also allows more interoperability between J2EE vendors. Before RMI-IIOP most vendors had proprietary RMI protocols optimized for their server.
 
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