I am sorry I misread your question. I guess that analogy would be:
why don't all Java classes have the same constructor?
I hope that this will not stop you from using EJB to build your application.
Regards,
Vlada
-----Original Message-----
From: Sachin Aggarwal <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, March 26, 1999 8:29 PM
Subject: Re: having same return type for ejbCreate and find( was RE: findByPrimaryKey )
>> First of all, a generic return type of create/find could not be
>> EntityBean.
>> If a generic type were used, it would have to be EJBObject.
>>
>> We decided to use the application-specific signature for 2 reasons:
>>
>> - The application does not have to use the ugly
>> PortableRemoteObject.narrow
>> type conversion; the code looks simple without the type conversion.
>>
>> - The PortableRemoteObject.narrow conversion may yield a round-trip
>> to the server on some implementations of RMI/IIOP.
>>
>> What don't you use code generation in your product? Most commercial
>> products do.
>
>I'm a bean developer and not a EJB server vendor. But looks like there were
>some technical reasons beyond my comprehension and I'll take your reasons as
>good reasons though it makes the sever side java developer's job a little
>difficult. :-)
>
>
>>
>> Vlada
>>
>> -----Original Message-----
>> From: Sachin Aggarwal <[EMAIL PROTECTED]>
>> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>> Date: Friday, March 26, 1999 6:50 PM
>> Subject: having same return type for ejbCreate and find( was RE:
>> findByPrimaryKey )
>>
>>
>> >This is a good time for me to ask why do the spec authors
>> require the return
>> >type to be the bean class.
>> >
>> >I ran into this problem with create method on home. I needed an
>> adapter on
>> >the client , wanted to use polymorphism to provide a method
>> >createEntity(String entityname) and I was *forced* to use reflection to
>> >execute the createMethod().
>> >
>> >Why don't we have the return type as EntityBean . I know that would mean
>> >more casting but I would think that as better than using reflection when
>> >implementing polymorphism or end up discouraging polymorphism.
>> >
>> >Same applies for the finder method .
>> >
>> >I think I'm missing something but can't figure it out.
>> >
>> >
>> >p.s Actually I would have the same question for java experts -
>> why not have
>> >a overridding method have a different return type as long as
>> it's subclass
>> >of the return type of the overridden method.
>> >
>> >
>> >
>> >
>> >> -----Original Message-----
>> >> From: A mailing list for Enterprise JavaBeans development
>> >> [mailto:[EMAIL PROTECTED]]On Behalf Of Vlada Matena
>> >> Sent: Friday, March 26, 1999 8:00 AM
>> >> To: [EMAIL PROTECTED]
>> >> Subject: Re: findByPrimaryKey
>> >>
>> >>
>> >> We want the signature of the findByPrimaryKey to have the exact types
>> >> for the input argument and the return value. This makes it
>> impossible to
>> >> include the method in the home interface because each enterprise bean
>> >> needs a different signature.
>> >>
>> >> Vlada
>> >>
>> >> -----Original Message-----
>> >> From: Saurabh Sahai <[EMAIL PROTECTED]>
>> >> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>> >> Date: Thursday, March 25, 1999 10:03 PM
>> >> Subject: Re: findByPrimaryKey
>> >>
>> >>
>> >> >Thanks Vlada.
>> >> >
>> >> >>Yes, the home interface of every entity bean must have the
>> >> >>findByPrimaryKey method, and every entity class with bean
>> >> >>managed persistence must define the ejbFindByPrimaryKey
>> >> >>method.
>> >> >>
>> >> >>The implementation of the ejbFindByPrimaryKey should verify
>> >> >>that the entity with the given primary key exists.
>> >> >>
>> >> >
>> >> >
>> >> >That is precisely what my point is. If every BMP entity bean has
>> >> to have an
>> >> >ejbFindByPrimaryKey method, should'nt this be a method on the
>> EntityBean
>> >> >interface. (Maybe we need a BMPEntityBean class).
>> >> >
>> >> >I am saying this because from a container's point, even though
>> >> the container
>> >> >knows that it is dealing with a BMP entity bean, it cannot do
>> >> something like
>> >> >:
>> >> >
>> >> > EntityBean bean;
>> >> > .........
>> >> > bean.ejbFindByPrimaryKey(...)
>> >> >
>> >> >It will need to use reflection to get the find method and invoke it.
>> >> >
>> >> >Thanks.
>> >> >
>> >> >-Saurabh
>> >> >
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