Separating code and data in two different packages.

Question

Hi,
I am trying to separate data and code that creates or consumes that data in two separate packages.
package X contains class or applet x. This is my container for data.
package Y contains applet y. The methods in this applet create and store data in x.
I would like to be able to delete the current package Y and replace it with a newer version of the package Y. The newer version may contain patches or bug fixes.
Please keep in mind that I want to keep package X untouched and keep on using the data which has been created or stored in it before Y was updated.
I have tried different ways to achieve this but keep facing one of the following problems:
1- when I delete package Y and replace it with the updated Y, the methods in Y loose the reference to the objects in X.
2- Sometimes I cannot delete package Y at all. I guess because it is still referencing an object in X.
I may post some code later, ... any ideas?
Thanks,
Hugo

Answer 1

Hi,
1- when I delete package Y and replace it with the updated Y, the methods in Y loose the reference to the objects in X.On the install method of the applet in Y, you need to lookup the AID object and SOI for the applet in X. You will already be doing this somewhere in your code, you just have to ensure that when you reinstall the applet that uses the interface that you get the references again.
2- Sometimes I cannot delete package Y at all. I guess because it is still referencing an object in X.This is to do with static references. You should implement AppletEvent in your applet and ensure that all static references are cleaned up in the uninstall method.
Cheers,
Shane