Which two statements are correct for making this code work as a stateless session bean, considering that this session bean is NOT defined in a deployment descriptor and the interfaces do NOT have annotations? (Choose two.)
A - Only the interface for remote usage must be annotated.
B - The interfaces B1 and B2 can only be used locally without changing the code.
C - Both interfaces B1 and B2 must be annotated to make this a working stateless session bean.
D - The interfaces B1 and B2 can be annotated differently, one with @Local and the other with @Remote.
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I would answer C and D. I think C is correct because my understanding is that if a sesssion bean implements a single interface then it defaults to Local whereas if a session bean implements two (or more) interfaces there must be explicitly annotated or defined in the deployment descriptor. I think D is correct beacuse I can't see any issue with a seesion bean implementing both Local and Remote interfaces (I'm sure that the O'Reilly EJB 3.0 gives an example of this in Chapter 11).
I'll take a look at the spec to see whether my understanding is correct. Meanwhile if anybody knows for sure I'd be interested in the answer and the reasoning.
• If bean class implements a single interface, that interface is assumed to be the business interface of the bean. This business interface will be a local interface unless the interface is designated as a remote business interface by use of the Remote annotation on the bean class or interface or by means of the deployment descriptor.
• A bean class is permitted to have more than one interface. If a bean class has more than one interface excluding the interfaces listed below—any business interface of the bean class must be explicitly designated as a business interface of the bean by means of the Local or Remote annotation on the bean class or interface or in the deployment descriptor.
posted 11 years ago
Hi Karnati Sudhakar,
Keep in mind that this behavior may be specific to a App Server (I guess this is jboss) . So be careful in the exam. exam totally focuses on the spec.