Error 404 /OA_HTML/AppsLogin was not found on the server

facing some problem in apps R12 login page (12.1.3)
Suddenly the login page was throwing an error
404 /OA_HTML/AppsLogin was not found on the
server
Error check on $LOG_FILE.
The access_log shows no errors. error.log from
$LOG_HOME/ora/10.1.3/Apache shows
[Tue Jan 26 11:27:51 2014] [error] [client
123.238.255.152] [ecid:
1295330271:192.168.0.20:10897:0:2,0] File does not
exist: /oracle/inst/apps/ORCL_oracle/
portal/OA_HTML/AppsLogin


Solutions:-

 
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.

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