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class casting with ejb

Lucas Smith
Ranch Hand

Joined: Apr 20, 2009
Posts: 804
    
    1

Hi,

I have an EJB client:



HelloWorld is an implementation class of HelloWorldRemote.

I have class cast exception that wrapper cannot be cast on HelloWorld.

When I use:
HelloWorldRemote hw = (HelloWorldRemote) ctx.lookup("ejb/HelloWorldBean");
everything runs flawlessly.

Can someone describe me this situation?


SCJP6, SCWCD5, OCE:EJBD6.
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Roberto Perillo
Bartender

Joined: Dec 28, 2007
Posts: 2265
    
    3

Howdy, Lucas.

Well champ, can you show us the code of HelloWorldBean, HelloWorld and HelloWorldRemote? Can you show us the exception's stack trace?


Cheers, Bob "John Lennon" Perillo
SCJP, SCWCD, SCJD, SCBCD - Daileon: A Tool for Enabling Domain Annotations
Ivan Krizsan
Ranch Hand

Joined: Oct 04, 2006
Posts: 2198
    
    1
Hi!
Unless the client is a local client to the EJB and uses a no-interface view of the EJB, you cannot use the implementation class when casting the result of the lookup.
In your case, what I can tell is:
1. The client is not a local client of the EJB, since it seems to be executing in another JVM than the EJB.
2. The EJB implements a remote interface. If you haven't explicitly annotated the EJB implementation class with @LocalBean, then there is no local view of the EJB.
Best wishes!


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