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EJB Question

Here is a question from one of the mock exams.

In CMP Entity Beans, which of the following statements is true?

a. The Entity Bean Class should not define any constructors
b. The Entity Bean class must define a no-argument constructor

The answer provided is (a). But is it correct? I don't see this in the EJB Spec. I think there is nothing wrong if the bean class provides empty constructor. Can anyone explain?


I think the catch lies in the sentence construction of the 2nd choice. Obvioulsy u can define a no-arg constructor, but is not mandatory. Thus ths 2nd choice which says: "must define a no-arg constructor" would not qualify

a) is write as you do not define a constructor in the implementation of an EJB, because there is the ejbCreate method, you use to create the bean. There is no impact if it is a BMP or CMP bean!

Look at the implementations in your guides, there is never any constructor, a class should normally have.

cheers stevica
Obviously the constructors don't play any role in CMP Entity Beans; all the creation is done via the ejbCreate method.

Prasad said:

I think there is nothing wrong if the bean class provides empty constructor.

There is nothing wrong with it, but providing this constructor doesn't serve any purpose.

BTW, I do see this constructor in a WebLogic 8.1 example.

I also didn't see any reference to this issue in the SUN FAQ EJB Restrictions page: http://java.sun.com/blueprints/qanda/ejb_tier/restrictions.html#threads

I am clear. Thank you all.


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