Blank Login Page Issue EBS R12

Solution:

- The first thing you need to check always is DB and listener is running fine.
- In case you are are not aware then I must tell you, its better to check if "apps" user is working fine.
- check is the Alert Log, as there may be issues related to Database.

Later comes the Apache logs. Location is "$LOG_HOME/ora/10.1.3/Apache".

The files are
error_log
access_log,
check the latest ones.

Following the steps to resolve the above issue:

1- Stop all application services       
$INST_TOP/admin/scripts/adstpall.sh

2- Remove any lock files from following folders:
$INST_TOP/ora/10.1.3/j2ee/oacore/persistence/oacore_default_group_1
$INST_TOP/ora/10.1.3/j2ee/oafm/persistence/oafm_default_group_1
$INST_TOP/ora/10.1.3/j2ee/forms/persistence/forms_default_group_1

3- Compile the JSP files with the following command
cd $FND_TOP/patch/115/bin
perl ojspCompile.pl --compile --flush -p 2

4 -Run Autoconfig first on the DB Tier, and then on APPS Tier

5 -Start appl services

$ADMIN_SCRIPTS_HOME/adstrtall.sh