I have Installed R12.2.0 base version and upgrade it to R12.2.4 and upgrade the database to 12cR1. After the installation and upgrade I was able to submit the concurrent requests and access java pages without any issue.
When I am trying to submit concurrent related requests from OAF page(submit Request for Background Engine) it takes me in to error page
Herewith I am attaching the screen shot for your reference.
Please help me on this issue.I have to release the instance for CRP
Can you please try to set FND Diagnostics profile to Yes at site/user level, reproduce the issue and see if you get link to get complete error stack on error page.