Toplink broken after EAR deploy

Question

After I deploy or re-deploy an application to OC4J 10.1.3.1, the application produces the following error:
Exception [TOPLINK-6007] (Oracle TopLink - 10g Release 3 (10.1.3.1.0) (Build 061004)): oracle.toplink.exceptions.QueryException Exception Description: Missing descriptor for [class com.htch.aps.tvsaudit.model.Tvsaudit]. Query: ReadAllQuery(com.htch.aps.tvsaudit.model.Tvsaudit)
Tvsaudit is a "model" class in my application.
If I then restart the Instance under which the application is deployed, Toplink works without error. (Restarting only the application does not solve the problem)
Why might Toplink be messed up after the deploy?

Answer 1

The issue is that your descriptors are still referencing the old undeployed classes.
You need to refresh/reload your TopLink session. If you are using the SessionManager you can call,
getSession(<name>, true /*login*/, true /*refresh*/)
to refresh the session.
Or use,
getSession(<loader>, <name>, <app-class-loader>, true /*login*/, false /*refresh*/, true /* refresh if class loader changed */)
to force a refresh on re-deploy in general.
But perhaps best store your TopLink session in a static variable in a class in your application. The first time this session is access load it from the SessionManager with the refresh option. This ensures that on re-deploy you will get the correct session.