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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