Hi all,
I have a class that is the super-interface of all primary key classes
(BasePK). What I have managed to do with this is to implement a generic
finder that can go to any entity bean and give back collections of primary
keys of the super interface type (in the ebjFindByXXXX() methods).
Over on the way to the home interface side, they are returned as collections
of the super-interface type of all remote interfaces.
In simple terms, I have an abstract layer above all my objects and
interfaces to make queries in all entity beans generic. i.e. you don't have
to care what bean you are calling.
This works fine when the signatures of my home and bean findByXXXX methods
define the returning of a Collection. But not when it is returning a single
row. (It wont let me have a generic findByPK method - JBoss complains about
casting from an ArrayList).
My generic finder looks like this:
public Collection ejbFindByAnythingForAnyBean(SomeParameters p)
*this works fine*.
However this doesn't:
public BasePK ejbFindByBasePK(BasePK pk)
{
return pk;
}
I get a class cast exception----JBoss is trying to return an ArrayList
(there can only be one object in this ArrayList because I am giving it a
primary key to look up by) instead of a single object.
My home interface is fine:
public BaseEJBObject findByBasePK(BasePK pk)
Does anyone know what is going on and why JBoss is refusing to let me return
a single primary key from my bean?
Many thanks in advance,
Birju
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