Pattern Composite Entity is still good for EJB 2.0

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Pattern Composite Entity is still good for EJB 2.0

Pattern Composite Entity is still good for EJB 2.0

2003-08-28 - By Sean Brydon

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Reply: 1 2 3 4

Hi,
Yes it is valid, especially for EJB2.0 and higher. Local EJBs make this
a valuable design. This pattern is discussed and updated in the second
edition of the patterns book, now available. An example of this strategy
is at
http://java.sun.com/blueprints/patterns/CompositeEntity.html
and this is done in the petstore application.

hope that helps,
Sean
Le Quang Tu wrote:

> Hi all,
> In "The Core J2EE pattern" book, the Composite Entity Pattern is
> recommended for the Coarse-Grained Entity bean. But in another book -
> "the EJB Pattern" which is available in theserverside.com, the author
> recommends that "Don't Use the Composite Entity Bean Pattern", because
> it is built for the 1.x specification. The problem with dependent
> objects is that they are impossible to create, using your application
> server's CMP engine and extremely difficult to implement using BMP.
> Managing the life cycle of a set of dependent objects in BMP
> is equivalent to writing your own persistence engine.
>
> EJB 2.0 can support the CMP EJB relationship among entity beans. With
> this enhancement, including Local interface, entity bean can now be
> used to domain objects in your design model as finely as you like.
>
> So is Composite Entity Pattern still good for EJB 2.0 now?
>
> Le Quang Tu
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