What about the ejbFindByPrimaryKey and ejbCreate method problems, if the
ParentPk and the ChildPk are different.
----- Original Message -----
From: Carlos Otero Barros <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 31, 2001 1:59 PM
Subject: Re: Inheritance : Once Again:
Hi Shelly.
I don´t see any problem inheriting the EJB class (the bean class). But
iheriting HI or RI you could get the deploy tool in trouble. A very
simple-minded deploy tool should expect the direct ancestor of a HI be the
EJBHome interface an so the RI. I´m not sure this is going to work on every
appserver, specially with J2EE Reference Implementation.
----- Original Message -----
From: "Shelly Aggrawal" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 31, 2001 8:30 AM
Subject: Inheritance : Once Again:
> Hi All,
> I know that we have visited Inheritance a lot of times in this mailing
> list.. but the following seems to be still unconfirmed:
>
> Suppose i have a parent entitybean, say ParentBean. The RI and Home I
Parent
> and ParentHome. the PK type is ParentPK...
> I understand that the only way to inherit an entity bean is by inheriting
> the interfaces and classes separately. So, i have a child which is
>
> public interface Child extends Parent{
> pubic void AChildMethod();
> }
>
> public class ChildBean extends ParentBean{}
>
> I do not see a problem with inheriting the remote interface and with the
> corresponding methods in the bean class. But can I, and is it valid, to
> inherit the home interface... considering the fact, that the ParentHome
will
> have a
> public Parent findByPrimaryKey() while the child will need to have a
> public Child findByPrimaryKey() ... this is neither overriding nor
> overloading... and hence will give a compilation error. A no argument
> create() will also give rise to the same problem. So I gather that the
> child can inherit the remote interface but not the home interface.
> So, Parent's home is something like this
> public interface ParentHome extends javx.ejb.EJBHome{
> public Parent findByPrimaryKey() ;
> public Parent create();
> }
>
> and the Child's home would be
> public interface ChildHome extends javx.ejb.EJBHome{
> public Child findByPrimaryKey() ;
> public Child create();
> }
>
> Now, what happens in the BeanClass... I derive the ChildBean from the
> ParentBean
> public class ParntBean implements javax.ejb.EntityBean{
> public ParentPK ejbCreate(){
> // return ParentPk
> }
> public ParentPK ejbFindByPrimaryKey(){
> // return ParentPk
> }
>
> }
>
> public class ChildBean extends ParentBean{
> public ChildPK ejbCreate(){
> // return ChildPk
> }
> public ChildPK ejbFindByPrimaryKey(){
> // return ChildtPk
> }
> }
> The compilation of ChildBean class will give errors. I may be able to
bypass
> this by declaring the ParentPK as the return type but in this case ejbc
> will give errors......
>
> Is this a restriction with Entity beans.. or is there some way to achieve
> inheritance.
> Any inputs will be most helpful.
>
> And also should the ChildPk be derived from ParentPK as in
> public class ChildPK extends ParentPK{
> int childId;
> }
>
> Thanks and Regards,
> Shelly
>
>
>
>
>
>
> About Inheritance in EJBs. I am presenting my views and doub
>
>
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>
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