EJB remote accesing case

[jcesar]

Hi,
I have the following case:
Client Classes:
- A
...

Server Classes:
- A
- B (subclass of A )
- MySessionBean

this session bean has a method like this:

public A doSomething(){
...//run tasks
//got B
return (A) B ;
}
Ok. now,
The problem is that, the RMI tries to send back an instance of B instead of A . And, since B is not present in the client distribution(and it is supposed not to be), the client throws the following exception:

Caused by: java.lang.ClassNotFoundException: B
(no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:368)

How would this problem be addressed?...

thanks for your comments...

Cesar.

[frito]

Hi,

IMHO, best practice should be to implement a method like this to B:
A getSuperClone();

returning a real instance of A.

Regards,

Frito

[jcesar]

I add a method to B, like this:

public A getSuperClone(){

return (A) super.clone();
}

and in the session bean.


public A doSomething(){

return B.getSuperClone();
}

BUT, still the RMI is sending back an instance of B.
I don't understand this behavior. I think RMI should marshall the object as A not as B. Is it a java RMI hole? or JBoss Hole?

comments welcomed.

Cesar.

[petertje]

clone() always gives a clone of the original object; casting can't fool the runtime system. So your method getSuperClone() still returns a B (put a of println(super.clone()); in your method and you'll see).

So what you have to is what the other reply suggested: create a _new_ A and return that one:
[pre]
public A getSuperClone()
{
A copy = new A();
A.setX = this.getX();
// etc.
return copy;
}
[/pre]