In Oracle Applications R12, the log files are located in $LOG_HOME ($INST_TOP/logs)
Concurrent Reqeust related logs
$LOG_HOME/appl/conc - > location for concurrent requests log and out files
$LOG_HOME/appl/admin - > location for mid tier startup scripts log files
Apache Logs (10.1.3 Oracle Home which is equivalent to iAS Oracle Home - Apache, OC4J and OPMN)
$LOG_HOME/ora/10.1.3/Apache - > Location for Apache Error and Access log files
$LOG_HOME/ora/10.1.3/j2ee - > location for j2ee related log files
$LOG_HOME/ora/10.1.3/opmn - > location for opmn related log files
Forms & Reports related logs (10.1.2 Oracle home)
$LOG_HOME/ora/10.1.2/forms
$LOG_HOME/ora/10.1.2/reports
Startup/Shutdown Log files location:
$INST_TOP/apps/$CONTEXT_NAME/logs/appl/admin/log
Patch log files location:
$APPL_TOP/admin/$SID/log/
Clone and AutoConfig log files location in Oracle E-Business Suite Release 12
Logs for the adpreclone.pl are located:
On the database tier:
RDBMS $ORACLE_HOME/appsutil/log/<context>/StageDBTier_< timestamp >.log
On the application tier:
$INST_TOP/admin/log/StageAppsTier_< timestamp >.log
Where the logs for the admkappsutil.pl are located?
On the application tier:
$INST_TOP/admin/log/MakeAppsUtil_< timestamp >.log