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What programming restrictions are defined in the EJB specifications?

Fu Dong Jia
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Joined: May 23, 2007
Posts: 131

What programming restrictions are defined in the EJB specifications?
1,An enterprise bean must NOT attempt to listen on a socket.
2,A session bean class must NOT have any superclasses and/or superinterfaces.
3,An enterprise bean can directly read a file descriptor.
4,An entity bean class need NOT implement a public zero-argument constructor.

I think the answer is 1,am i correct?


who dare win!<br />SCJP5(94%)|SCWCD5(86%)|SCBCD(100%)|SCEA in progress
Ralph Jaus
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Joined: Apr 27, 2008
Posts: 342
I also think that 1. is the correct answer (compare core spec 21.1.2).


SCJP 5 (98%) - SCBCD 5 (98%)
Christophe Verré
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Joined: Nov 24, 2005
Posts: 14688
    
  16

Don't forget to quote your sources.


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Chaminda Amarasinghe
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Joined: May 17, 2006
Posts: 402
I also think so. But the question seems bit doubtful. See the option 3. Its not abt a restriction.
Tomaszz Lewandowski
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Joined: Sep 07, 2007
Posts: 30
1. is correct. It's good to remember this question


Regards<br />Tomasz Lewandowski<br />SCJP5 (97%) | SCWCD5 (98%)
Ralph Jaus
Ranch Hand

Joined: Apr 27, 2008
Posts: 342
It's good to remember this question
Was it part of your exam, Tomaszz ? (just a rhetoric question). I see you passed it with a great score. Congrats! Share your experiences with us.
Tomaszz Lewandowski
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Joined: Sep 07, 2007
Posts: 30
Well, I had basic knowledge of EJBs, so I didn't used books, only specs (I read them twice and used many times to find answers). I also read many posts from this forum (even the old ones) and I think it is very helpful. Personally I think that SCBCD was the easiest exam (as compared to SCJP and SCWCD).
Amandeep Singh
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Joined: Jul 17, 2008
Posts: 845
Along with answer 1. The answer 3 is also correct.
As the session beans should never attempt to read a file descriptor.
I think reading the file descriptor is equivalent to using the FileOutputStream only.


SCJP 1.4, SCWCD 5, SCBCD 5, OCPJWSD 5,SCEA-1, Started Assignment Part 2
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Chaminda Amarasinghe
Ranch Hand

Joined: May 17, 2006
Posts: 402
Hi Amandeep,

Yes I agree to you. but it says "An enterprise bean can directly read a file descriptor." not "Can NOT". Its not a restriction. Thats why I said question is bit doubtful.

any way in real exam, they have highlighted special cases using upper cases. for example "An enterprise bean CAN directly read a file descriptor."

Tomaszz, I agree you. I think JP was the hardest exam to me than both WCD and BCD.
 
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