ORACLE R12 Troubleshooting On OEL 5.5

if you find an error :

The requested
URL /OA_HTML/AppsLogin was not found on this server.

( view By Mozzila)

this how to solve :

This problem occurred because wsrp_service.wsdl was owned by root but the services were being started by applmgr.

Ensure that the file
$ORA_CONFIG_HOME/10.1.3/j2ee/oacore/application-deployments/oacore/html/server-wsdl/wsrp_service.wsdl

it shows it is owned by root. Somebody started the services of Apps as root user.

Changed the owner of the file to Apps Owner.

Restarted the service.

Everything works fine.