Java Server upgrade from 620 to 640
What are the options available to upgrade J2EE Server (Standalone and Java Add-on) from 620 to 640 Server?
I am looking for "How to Guide" or any OSS notes on the same.
There is no upgrade procedure from j2ee engine 6.20 to 6.40 instead you must migrate your applications.
As a result of the new architecture in 6.40, it is not possible to upgrade from 6.20 to 6.40. You must install a new J2EE Engine 6.40 and redeploy on it all applications that were running on J2EE Engine 6.20.
See the migration manual on help.sap.com