Java concurrent program failing post RPC5 upgrade

The program prints the invoice details. It, in turn, calls a plsql package which does the processing. This program worked until the RPC5 upgrade.

The program completes in ERROR but the output is generated successfully. We have already performed the below debug options:

>Ran the plsql package in anonymous block which returned retcode 0

>Displayed the retcode in java code, even that returns 0

>There is no exception captured in catch block

Please let us know if you have faced a similar issue and the resolution.

Please find the below code

package oracle.apps.xxcust.cp;

import oracle.apps.fnd.cp.request.*;