INTERVIEW QUESTIONS J2EE EJB DETAILS

Question: What is the importance of the Narrow class in RMI?

Answer: Since client never talk to bean directly ,client get reference to component interface (EJBObject) by calling create() method on home interface

Client use JNDI to get reference to home interface, for that it first gets the InitialContext

Context ic=new InitialContext(); Object 0=ic.lookup("String");

Client use initial context to lookup bean home, but home stub returned from JNDI lookup might not implement the home interface, To get the stub that is castable to home interface you have to narrow() the object you get from JNDI lookup , so to cast the object we get from JNDI lookup we use narrow() method.

Since client never talk to bean directly ,client get reference to component interface (EJBObject) by calling create() method on home interface

Client use JNDI to get reference to home interface, for that it first gets the InitialContext

Context ic=new InitialContext(); Object 0=ic.lookup("String");

Client use initial context to lookup bean home, but home stub returned from JNDI lookup might not implement the home interface, To get the stub that is castable to home interface you have to narrow() the object you get from JNDI lookup , so to cast the object we get from JNDI lookup we use narrow() method.
Source: CoolInterview.com

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