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ejbCreate and ejbPostCreate in Entity Bean

Posted on 2002-03-17
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Why ejbPostCreate method is required in entity bean?
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Question by:virendra032700
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Expert Comment

by:girionis
ID: 6874237
 From "Proffesional EJB" (Wrox Press) page 109:

"The fundamental reason ejbPostCreate exists is because the programmer is never allowed to pass "this" as a parameter to a remote method; they must always use the remote interface instead. However, the remote interface for the bean is not available until ejbCreate() returns. If they needed the remote interface during the creation of the EJB component, there would be no way to proceed. Rather than leave this hole in the specification, an "after create" method was developed in which the remote interface would be available. This method is the ejbPostCreate(). The same situation exists with the primary key in CMP, because the container creates the key. If the primary key is needed for some reason, that work also needs to be done in ejbPostCreate(). Why would you need to pass the EJB's remote reference or primary key to another EJB during its creation? Perhaps one of the main reasons is to set up relationships, for example when you create the employee you want the boss to have a reference to."
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by:virendra032700
ID: 6880032
girionis,

Thank you for your reply. I have read what ever you have written in a book. But is is not clear.
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by:dyma82
ID: 6883018
When you need to do some extra-initialization after the execution of the create() method. Most of the time it is empty (do nothing). At least that is my personal experience.
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girionis earned 50 total points
ID: 6894856
 My understanding is that basically you create the data representing the entity bean inside the ejbCreate() method and you can initialize the values of the data inside the ejbPostCreate(). Of course this could be also done inside the ejbCreate(). Maybe the following URL is helpful to you: http://www.jguru.com/faq/view.jsp?EID=51577
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Author Comment

by:virendra032700
ID: 6898644
Hi Girionis,

I thank for your effort.
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Expert Comment

by:girionis
ID: 6899927
Any time... Hope I ws helpful. :-)
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by:Moondancer
ID: 6956164
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Expert Comment

by:dyma82
ID: 6977259
I don't think the selected answer deserve a "C" grade. It is completely correct and there is not much else you could say about the ejbPostCreate() method. The distribute schema is abstract and some times difficult to understand, but it is man-made, and it comes with instructions from its creators.

Just my opinion!  
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Expert Comment

by:dyma82
ID: 6977266
Oops, I forgot. I think the selected answer should be graded "A".
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by:Moondancer
ID: 6977550
Thanks for returning and finalizing this.  Experts appreciate knowing their shortfall if they have not
achieved their goal of providing you A level solutions.  Comments for grades less than A are always appreciated.

Since this was a request posted in the initial information to you above, and since the further explanation by dyma82 expounds further, I can only assume this was in error and correct it.

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