Login page error: 404 - The url /OA_HTML/AppsLogin not found

This blog speaks about the Login Page Issue on R12.1.1 instance.

Suddenly the login page was throwing an error - 404 /OA_HTML/AppsLogin was not found on the server

The access_log shows no errors. error.log from $LOG_HOME/ora/10.1.3/Apache shows

[Tue Jan 18 11:27:51 2011] [error] [client 123.238.255.152] [ecid: 1295330271:127.0.0.1:10897:0:2,0] File does not exist: /oracle/CLON/inst/apps/CLON_obaserver/portal/OA_HTML/AppsLogin
[Tue Jan 18 11:27:54 2011] [error] [client 123.238.255.152] [ecid: 1295330274:127.0.0.1:10897:0:3,0] File does not exist: /oracle/CLON/inst/apps/CLON_obaserver/portal/OA_HTML/AppsLogin
[Tue Jan 18 11:30:10 2011] [error] [client 123.238.255.152] [ecid: 1295330410:127.0.0.1:10899:0:2,0] File does not exist: /oracle/CLON/inst/apps/CLON_obaserver/portal/OA_HTML/AppsLogin


I recreated the jar files using adadmin

and compiled the jsp using

cd $FND_TOP/patch/115/bin
perl ojspCompile.pl --compile --flush -p 20 -log /tmp/ojspc_error2.log
Nothing worked out.

Fix:
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.